Professor Nick Hewitt

Professor

Research Interests

Research Interests

EMISSIONS OF BIOGENIC REACTIVE TRACE GASES AND THEIR ROLES IN THE EARTH SYSTEM

The biosphere is by far the largest source of reactive trace gases to the Earth’s atmosphere. These compounds provide protection against abiotic and biotic stresses and allow plant-to-plant and plant-to-insect communication. Some of these compounds are highly reactive in the gas phase, and some are emitted in enormous, but unknown, quantities. The combination of high reactivity and large mass emission rates means these compounds play major roles in the physics and chemistry of the atmosphere. They mediate in the formation of ozone, hydroxyl and other oxidants, so controlling the oxidizing capacity of the atmosphere, which in turn controls the lifetime of methane and other radiatively-active “greenhouse” gases. They also form secondary organic aerosol (SOA) particles, which can directly influence the radiative balance of the atmosphere. SOA may activate cloud condensation nuclei (CNN), and by modifying cloud formation and properties can have indirect effects on climate. As well as their effects on radiative forcing, both ozone and aerosol particles have detrimental effects on human health and ecosystem functioning, and hence bVOCs play a role not only in the Earth’s climate system but also in air quality.

My research on biogenic volatile organic compounds (bVOCs) spans scales from the cell to the globe and includes both experimental and modelling work. I was PI of a large NERC consortium project studying the role of bVOCs in atmospheric composition and chemistry above a tropical rain forest in Malaysia (the “OP3” project – see OP3 special issue in ACP and other papers, including our 2009 paper in PNAS). In this project we showed that large-scale land use change in the tropics – specifically the conversion of tropical rain forest to oil palm plantations – causes changes in atmospheric composition and chemistry. Using measurements and models we showed that the management of the emissions of reactive nitrogen species is essential to prevent formation of damaging levels of ground-level ozone in these regions.

In our paper in Nature Climate Change in 2013 we similarly showed that the large-scale conversion of farm land in Europe to the production of poplar or willow (now grown as biofuels) will likely exacerbate ground-level ozone pollution, with detrimental effects on human mortality and crop yields.

In 2013-2014 we have been measuring the fluxes of the important bVOC, isoprene, at a remote site in Amazonia. We have obtained a unique nine-month record of isoprene fluxes and are currently writing this up for publications

In 2013-2014 we also developed the ability to measure hydrocarbon fluxes from the surface to the atmosphere at the landscape scale using a mass spectrometer on a light airplane (the NERC ARSF Dornier 228). We flew over London and SE England and obtained the first airborne flux measurements of benzene, toluene and isoprene in Europe. These data are also currently being written up for publication.

CLIMATE-SOCIETY FEEDBACKS AND THE AVOIDANCE OF CLIMATE CHANGE

I have become very interested in how both individual actions and societal choices might influence atmospheric composition and hence climate. Having discovered the work of William Jevons and his paradox (his 1865 book “The Coal Question” is available on the web) I have been collaborating with Andy Jarvis at Lancaster on climate–society feedbacks and the avoidance of climate change. In our 2012 paper in Nature Climate Change we showed that effective climate mitigation will require establishing a meaningful climate-society feedback to arrest the growth in global CO2 emissions through decarbonising global primary energy sources.

In our current joint work we are exploring how the global energy system and CO2 emissions have co-evolved. Although still at an early stage, it appears that global CO2 emissions have grown at ~3/4 the rate of the growth in primary energy use. Similarly final energy use has grown at ~3/4 the rate of the growth in primary energy use. We hypothesis that this may be because the growth in energy use is regulated in part by the architecture of the network along which it is distributed into the three dimensional space in which humans operate.

We have also been attempting to construct 'Business-As-Usual' forecasts of global primary energy use (and CO2 emissions) based simply on the observed behaviour of these metrics over the last 160 years. We argue that this gives a better prediction of future energy use and CO2 emissions than do scenarios, as used by the IPCC. This work is currently available as a discussion paper in Earth System Science Discussions.

I have also recently attempted to quantify the influence of realistic dietary choices on greenhouse gas emissions.

I am a Royal Society Wolfson Research Merit Award holder.

Concentrations of selected volatile organic compounds at kerbside and background sites in central London
Valach, A., Langford, B., Nemitz, E., MacKenzie, R., Hewitt, C.N. 10/2014 In: Atmospheric Environment. 95, p. 456-467. 12 p.
Journal article

Volatile organic compound fluxes and concentrations in London (ClearfLo)
Valach, A., Langford, B., Nemitz, E., MacKenzie, R., Hewitt, C.N. 04/2014
Conference paper

Spatially-varying surface roughness and ground-level air quality in an operational dispersion model
Barnes, M., Brade, T.K., Mackenzie, A.R., Whyatt, D., Carruthers, D.J., Stocker, J., Cai, X., Hewitt, C.N. 02/2014 In: Environmental Pollution. 185, p. 44-51. 8 p.
Journal article

Isoprene emission protects photosynthesis but reduces plant productivity during drought in transgenic tobacco (Nicotiana tabacum) plants
Ryan, A., Hewitt, C.N., Purnell, A., Possell, M., Vickers, C., Mullineaux, P., Davies, B., Dodd, I. 01/2014 In: New Phytologist. 201, 1, p. 205-216. 12 p.
Journal article

Influence of future climate and cropland expansion on isoprene emissions and tropospheric ozone
Squire, O.J., Archibald, A.T., Beerling, D.J., Hewitt, C.N., Lathiere, J., Pike, R.C., Telford, P.J., Pyle, J.A. 2014 In: Atmospheric Chemistry and Physics . 14, p. 1011–1024 . 14 p.
Journal article

Mitigating the greenhouse gas emissions of food through realistic consumer choices
Hoolohan, C., Berners-Lee, M., McKinstry-West, J., Hewitt, C.N. 12/2013 In: Energy Policy. 63, p. 1065-1074. 10 p.
Journal article

Investigating the impacts of anthropogenic and biogenic VOC emissions and elevated temperatures during the 2003 ozone episode in the UK
Strong, J., Whyatt, D., Metcalfe, S., Derwent, R., Hewitt, C.N. 08/2013 In: Atmospheric Environment. 74, p. 393-401. 9 p.
Journal article

Effects of the spatial resolution of climate data on estimates of biogenic isoprene emissions
Pugh, T.A.M., Ashworth, K., Wild, O., Hewitt, C.N. 05/2013 In: Atmospheric Environment. 70, p. 1-6. 6 p.
Journal article

Impacts of biofuel cultivation on mortality and crop yields
Ashworth, K., Wild, O., Hewitt, C.N. 05/2013 In: Nature Climate Change. 3, 5, 5 p.
Letter

Photosynthesis-dependent isoprene emission from leaf to planet in a global carbon-chemistry-climate model
Unger, N., Harper, K., Zheng, Y., Kiang, N.Y., Aleinov, I., Arneth, A., Schurgers, G., Amelynyck, C., Goldstein, A., Guenther, A., Heinesch, B., Hewitt, C.N., Karl, T., Laffineur, Q., Langford, B., McKinney, K.A., Misztal, P., Potosnak, M., Rinne, J., Pressley, S., Schoon, N., Serca, D. 2013 In: Atmospheric Chemistry and Physics . 13, p. 10243-10269 . 27 p.
Journal article

Plant pest and disease diagnosis using electronic nose and support vector machine approach
Ghaffari, R., Laothawornkitkul, J., Iliescu, D., Hines, E., Leeson, M., Napier, R., Moore, J.P., Paul, N.D., Hewitt, N., Taylor, J.E. 12/2012 In: Journal of Plant Diseases and Protection. 119, 5-6, p. 200-207. 8 p.
Journal article

Climate-society feedbacks and the avoidance of dangerous climate change
Jarvis, A.J., Leedal, D.T., Hewitt, C.N. 09/2012 In: Nature Climate Change. 2, 9, p. 668-671. 4 p.
Journal article

Reply to 'Circadian control of global isoprene emissions'
Hewitt, C.N., Ashworth, K., Boynard, A., Guenther, A., Langford, B., MacKenzie, A.R., Misztal, P.K., Nemitz, E., Owen, S.M., Possell, M., Pugh, T.A.M., Ryan, A.C., Wild, O. 07/2012 In: Nature Geoscience. 5, 7, 2 p.
Letter

Plant pest and disease diagnosis using electronic nose and support vector machine
Ghaffari, R., Laothawornkitkul, J., Iliescu, D., Hines, E., Leeson, M., Napier, R., Moore, J., Paul, N., Hewitt, N., Taylor, J. 5/06/2012 In: Journal of Plant Diseases and Protection. 119, p. 200-207. 8 p.
Journal article

Scenario archetypes: converging rather than diverging themes
Hunt, D., Lombardi, D.R., Atkinson, S., Barber, A.R.G., Barnes, M., Boyko, C., Brown, J., Bryson, J., Butler, D., Caputo, S., Caserio, M., Coles, R., Cooper, R., Farmani, R., Gaterell, M., Hale, J., Hales, A.C., Hewitt, C.N., Jankovic, L., Jefferson, I., Leach, J., Mackenzie, R., Memon, F.A., Sadler, J.P., Weingaertner, C., Whyatt, D., Rogers, C.D. 20/04/2012 In: Sustainability. 4, 4, p. 740-772. 33 p.
Journal article

Designing Resilient Cities: A guide to good practice
Lombardi, D.R., Leach, J.M., Rogers, C.D., Aston, R., Barber, A., Boyko, C., Brown, J., Bryson, J.R., Butler, D., Caputo, S., Caserio, M., Coles, R., Cooper, R., Coyne, R., Farmani, R., Gaterell, M., Hale, J., Hales, A.C., Hewitt, C.N., Hunt, D., Jancovic, L., Jefferson, I., Mackenzie, R., Memon, F.A., Phenix-Walker, R., Pugh, T., Sadler, J.P., Weingaertner, C., Whyatt, D. 04/2012 Bracknell : IHS BRE Press. 126 p. ISBN: 978-1-84806-253-5.
Book

Benchmarking sustainability in cities: The role of indicators and future scenarios
Boyko, C., Gaterell, M., Barber, A.R.G., Brown, J., Bryson, J.R., Butler, D., Caputo, S., Caserio, M., Coles, R., Cooper, R., Davies, G., Farmani, R., Hale, J., Hales, A.C., Hewitt, C.N., Hunt, D.V.L., Jankovic, L., Jefferson, I., Leach, J.M., Lombardi, D.R., Mackenzie, R., Memon, F.A., Pugh, T., Sadler, J.P., Weingaertner, C., Whyatt, D., Rogers, C.D. 02/2012 In: Global Environmental Change. 22, 1, p. 245-254. 10 p.
Journal article

A Lagrangian model of air-mass photochemistry and mixing using a trajectory ensemble: the Cambridge Tropospheric Trajectory model of Chemistry And Transport (CiTTyCAT) version 4.2
Pugh, T., Cain, M., Methven, J., Wild, O., Arnold, S.R., Real, E., Law, K.S., Emmerson, K.M., Owen, S.M., Pyle, J.A., Hewitt, C.N., Mackenzie, R. 31/01/2012 In: Geoscientific Model Development. 5, 1, p. 193-221. 29 p.
Journal article

Impacts of near-future cultivation of biofuel feedstocks on atmospheric composition and local air quality
Ashworth, K., Folberth, G., Hewitt, C.N., Wild, O. 19/01/2012 In: Atmospheric Chemistry and Physics . 12, 2, p. 919-939. 21 p.
Journal article

A futures-based analysis for urban air quality remediation
Pugh, T., Mackenzie, R., Davies, G., Whyatt, D., Barnes, M., Hewitt, C.N. 2012 In: Proceedings of the Institution of Civil Engineers Engineering Sustainability. 165, 1, p. 21-36. 16 p.
Journal article

Atmospheric chemistry and physics in the atmosphere of a developed megacity (London): an overview of the REPARTEE experiment and its conclusions
Harrison, R.M., Dall'Osto, M., Beddows, D.C.S., Thorpe, A.J., Bloss, W.J., Allan, J.D., Coe, H., Dorsey, J.R., Gallagher, M., Martin, C., Whitehead, J., Williams, P.I., Jones, R., Langridge, J.M., Benton, A.K., Ball, S.M., Langford, B., Hewitt, C.N., Davison, B., Martin, D., Petersson, K.F., Henshaw, S.J., White, I.R., Shallcross, D.E., Barlow, J.F., Dunbar, T., Davies, F., Nemitz, E., Phillips, G.J., Helfter, C., Di Marco, C.F., Smith, S. 2012 In: Atmospheric Chemistry and Physics . 12, 6, p. 3065 - 3114. 50 p.
Journal article

Effectiveness of green infrastructure for improvement of air quality in urban street canyons
Pugh, T., Mackenzie, R., Whyatt, D., Hewitt, C.N. 2012 In: Environmental Science and Technology. 46, 14, p. 7692–7699. 8 p.
Journal article

Observations of total peroxy nitrates and total alkyl nitrates during the OP3 campaign: isoprene nitrate chemistry above a south-east Asian tropical rain forest
Aruffo, E., Di Carlo, P., Dari-Salisburgo, C., Biancofiore, F., Giammaria, F., Lee, J., Moller, S., Evans, M.J., Hopkins, J.R., Jones, C., Mackenzie, R., Hewitt, C.N. 2012 In: Atmospheric Chemistry and Physics . 12, p. 4797-4829. 32 p.
Journal article

The relative greenhouse gas impacts of realistic dietary choices
Berners-Lee, M., Hoolohan, C., Cammack, H., Hewitt, C.N. 2012 In: Energy Policy. 43, p. 184-190. 7 p.
Journal article

The impact of local surface changes in Borneo on atmospheric composition at wider spatial scales: coastal processes, land-use change and air quality
Pyle, J.A., Warwick, N.J., Harris, N.R.P., Abas, M.R., Archibald, A.T., Ashfold, M.J., Ashworth, K., Barkley, M.P., Carver, G.D., Chance, K., Dorsey, J.R., Fowler, D., Gonzi, S., Gostlow, B., Hewitt, C.N., Kurosu, T.P., Lee, J.D., Langford, B., Moller, S., Mackenzie, A.R., Manning, A.J., Misztal, P., Nadzir, M.S.M., Nemitz, E., Newton, H., O'Brien, L.M., Ong, S., Oram, D., Palmer, P.I., Peng, L.K., Phang, S., Pike, R., Pugh, T.A.M., Rahman, N.A., Robinson, A.D., Sentian, J., Samah, A.A., Skiba, U., Ung, H.E., Yong, S.E., Young, P.J. 27/11/2011 In: Philosophical Transactions B: Biological Sciences. 366, 1582, p. 3210-3224 . 15 p.
Journal article

Ground-level ozone influenced by circadian control of isoprene emissions
Hewitt, C.N., Ashworth, K., Boynard, A., Guenther, A., Langford, B., MacKenzie, A.R., Misztal, P.K., Nemitz, E., Owen, S.M., Possell, M., Pugh, T.A.M., Ryan, A.C., Wild, O. 10/2011 In: Nature Geoscience. 4, 10, p. 671-674. 4 p.
Journal article

Effects of climate-induced changes in isoprene emissions after the eruption of Mount Pinatubo
Telford, P.J., Lathiere, J., Abraham, N.L., Archibald, A.T., Braesicke, P., Johnson, C.E., Morgenstern, O., O'Connor, F.M., Pike, R.C., Wild, O., Young, P., Beerling, D.J., Hewitt, C.N., Pyle, J.A. 06/2011 In: Procedia Environmental Sciences. 6, p. 199-205. 7 p.
Journal article

Isoprene synthesis in plants: lessons from a transgenic tobacco model
Vickers, C.E., Possell, M., Laothawornkitkul, J., Ryan, A., Hewitt, C.N., Mullineaux, P.M. 06/2011 In: Plant, Cell and Environment. 34, 6, p. 1043-1053. 11 p.
Journal article

Isoprene emissions from plants are mediated by atmospheric CO2 concentrations
Possell, M., Hewitt, C.N. 04/2011 In: Global Change Biology. 17, 4, p. 1595-1610. 16 p.
Journal article

Direct ecosystem fluxes of volatile organic compounds from oil palms in South-East Asia
Misztal, P.K., Nemitz, E., Langford, B., Di Marco, C.F., Phillips, G.J., Hewitt, C.N., Mackenzie, R., Owen, S.M., Fowler, D., Heal, M.R., Cape, J.N. 2011 In: Atmospheric Chemistry and Physics . 11, 17, p. 8995-9017. 23 p.
Journal article

Evidence for a significant proportion of Secondary Organic Aerosol from isoprene above a maritime tropical forest
Robinson, N.H., Hamilton, J.F., Allan, J.D., Langford, B., Oram, D.E., Chen, Q., Docherty, K., Farmer, D.K., Jimenez, J.L., Ward, M.W., Hewitt, C.N., Barley, M.H., Jenkin, M.E., Rickard, A.R., Martin, S.T., McFiggans, G., Coe, H. 2011 In: Atmospheric Chemistry and Physics . 11, 3, p. 1039-1050. 12 p.
Journal article

Global terrestrial isoprene emission models: sensitivity to variability in climate and vegetation
Arneth, A., Schurgers, G., Lathiere, J., Duhl, T., Beerling, D.J., Hewitt, C.N., Martin, M., Guenther, A. 2011 In: Atmospheric Chemistry and Physics . 11, 15, p. 8037-8052. 16 p.
Journal article

Quantification of VOC emission rates from the biosphere
Hewitt, C.N., Karl, T., Langford, B., Owen, S.M., Possell, M. 2011 In: Trac-Trends in analytical chemistry. 30, 7, p. 937-944. 8 p.
Journal article

The influence of small-scale variations in isoprene concentrations on atmospheric chemistry over a tropical rainforest
Pugh, T., Mackenzie, R., Langford, B., Nemitz, E., Misztal, P.K., Hewitt, C.N. 2011 In: Atmospheric Chemistry and Physics . 11, 9, p. 4121-4134. 14 p.
Journal article

The regional biogenic emissions response to climate changes and ambient CO2 in southeast Asia
Sentian, J., Mackenzie, R., Hewitt, C.N. 2011 In: International Journal of Climate Change: Impacts and Responses. 2, 3, p. 125-142. 18 p.
Journal article

Effects of climate-induced changes in isoprene emissions after the eruption of Mount Pinatubo
Telford, P.J., Lathiere, J., Abraham, N.L., Archibald, A.T., Braesicke, P., Johnson, C.E., Morgenstern, O., O'Connor, F.M., Pike, R.C., Wild, O., Young, P., Beerling, D.J., Hewitt, C.N., Pyle, J. 3/08/2010 In: Atmospheric Chemistry and Physics . 10, 15, p. 7117-7125. 9 p.
Journal article

Genetic structure and regulation of isoprene synthase in Poplar (Populus spp.)
Vickers, C.E., Possell, M., Hewitt, C.N., Mullineaux, P.M. 07/2010 In: Plant Molecular Biology. 73, 4-5, p. 547-558. 12 p.
Journal article

Effects of fosmidomycin on plant photosynthesis as measured by gas exchange and chlorophyll fluorescence
Possell, M., Ryan, A., Vickers, C., Mullineaux, P.M., Hewitt, C.N. 04/2010 In: Photosynthesis Research. 104, 1, p. 49-59. 11 p.
Journal article

Modelling chemistry in the nocturnal boundary layer above tropical rainforest and a generalised effective nocturnal ozone deposition velocity for sub-ppbv NOx conditions
Pugh, T., Ryder, J., Mackenzie, R., Moller, S.J., Lee, J.D., Helfter, C., Nemitz, E., Lowe, D., Hewitt, C.N. 04/2010 In: Journal of Atmospheric Chemistry. 65, 2-3, p. 89-110. 22 p.
Journal article

Sensitivity of isoprene emissions from the terrestrial biosphere to 20th century changes in atmospheric CO2 concentration, climate, and land use
Lathiere, J., Hewitt, C.N., Beerling, D.J. 11/02/2010 In: Global Biogeochemical Cycles. 24, p. -. 11 p.
Journal article

Development and application of a Lagrangian model to determine the origins of ozone episodes in the UK
Strong, J., Whyatt, D., Hewitt, C.N., Derwent, R.G. 02/2010 In: Atmospheric Environment. 44, 5, p. 631-641. 11 p.
Journal article

Sensitivity of isoprene emissions estimated using MEGAN to the time resolution of input climate data
Ashworth, K., Wild, O., Hewitt, C.N. 02/2010 In: Atmospheric Chemistry and Physics . 10, 3, p. 1193-1201. 9 p.
Journal article

Fluxes and concentrations of volatile organic compounds above central London, UK
Langford, B., Nemitz, E., House, E., Phillips, G.J., Famulari, D., Davison, B., Hopkins, J.R., Lewis, A.C., Hewitt, C.N. 2010 In: Atmospheric Chemistry and Physics . 10, 2, p. 627-645. 19 p.
Journal article

Fluxes and concentrations of volatile organic compounds from a South-East Asian tropical rainforest
Langford, B., Misztal, P.K., Nemitz, E., Davison, B., Helfter, C., Pugh, T., Mackenzie, R., Lim, S.F., Hewitt, C.N. 2010 In: Atmospheric Chemistry and Physics . 10, 17, p. 8391-8412. 22 p.
Journal article

Large estragole fluxes from oil palms in Borneo
Misztal, P.K., Owen, S.M., Guenther, A.B., Rasmussen, R., Geron, C., Harley, P., Phillips, G.J., Ryan, A., Edwards, D.P., Nemitz, E., Siong, J., Heal, M.R., Hewitt, C.N., Cape, J.N. 2010 In: Atmospheric Chemistry and Physics . 10, 9, p. 4343-4358. 16 p.
Journal article

NOx and O3 above a tropical rainforest: an analysis with a global and box model
Pike, R.C., Lee, J.D., Young, P.J., Carver, G.D., Yang, X., Warwick, N., Moller, S., Misztal, P., Langford, B., Stewart, D., Reeves, C.E., Hewitt, C.N., Pyle, J.A. 2010 In: Atmospheric Chemistry and Physics . 10, 21, p. 10607-10620. 14 p.
Journal article

Overview: oxidant and particle photochemical processes above a south-east Asian tropical rainforest (the OP3 project): introduction, rationale, location characteristics and tools
Hewitt, C.N., Lee, J.D., Mackenzie, R., Barkley, M.P., Carslaw, N., Carver, G.D., Chappell, N., Coe, H., Collier, C., Commane, R., Davies, F., Davison, B., Di Carlo, P., Di Marco, C.F., Dorsey, J.R., Edwards, P.M., Evans, M.J., Fowler, D., Furneaux, K.L., Gallagher, M., Guenther, A., Heard, D.E., Helfter, C., Hopkins, J., Ingham, T., Irwin, M., Jones, C., Karunaharan, A., Langford, B., Lewis, A.C., Lim, S.F., MacDonald, S.M., Mahajan, A.S., Malpass, S., McFiggans, G., Mills, G., Misztal, P., Moller, S., Monks, P.S., Nemitz, E., Nicolas-Perea, V., Oetjen, H., Oram, D.E., Palmer, P.I., Phillips, G.J., Pike, R., Plane, J.M.C., Pugh, T., Pyle, J.A., Reeves, C.E., Robinson, N.H., Stewart, D., Stone, D., Whalley, L.K., Yin, X. 2010
Scientific review

Overview: oxidant and particle photochemical processes above a south-east Asian tropical rainforest (the OP3 project): introduction, rationale, location characteristics and tools (vol 10, pg 169, 2010)
Hewitt, C.N., Lee, J.D., Mackenzie, R., Barkley, M.P., Carslaw, N., Carver, G.D., Chappell, N., Coe, H., Collier, C., Commane, R., Davies, F., Davison, B., Di Carlo, P., Di Marco, C.F., Dorsey, J.R., Edwards, P.M., Evans, M.J., Fowler, D., Furneaux, K.L., Gallagher, M., Guenther, A., Heard, D.E., Helfter, C., Hopkins, J., Ingham, T., Irwin, M., Jones, C., Karunaharan, A., Langford, B., Lewis, A.C., Lim, S.F., MacDonald, S.M., Mahajan, A.S., Malpass, S., McFiggans, G., Mills, G., Misztal, P., Moller, S., Monks, P.S., Nemitz, E., Nicolas-Perea, V., Oetjen, H., Oram, D.E., Palmer, P.I., Phillips, G.J., Pike, R., Plane, J.M.C., Pugh, T., Pyle, J.A., Reeves, C.E., Robinson, N.H., Stewart, D., Stone, D., Whalley, L.K., Yang, X. 2010 In: Atmospheric Chemistry and Physics . 10, 2, p. 563-563. 1 p.
Journal article

Simulating atmospheric composition over a South-East Asian tropical rainforest: performance of a chemistry box model
Pugh, T., Mackenzie, R., Hewitt, C.N., Langford, B., Edwards, P.M., Furneaux, K.L., Heard, D.E., Hopkins, J.R., Jones, C.E., Karunaharan, A., Lee, J., Mills, G., Misztal, P., Moller, S., Monks, P.S., Whalley, L.K. 2010 In: Atmospheric Chemistry and Physics . 10, 1, p. 279-298. 20 p.
Journal article

Uptake of Aldehydes and Ketones at Typical Indoor Concentrations by Houseplants
Tani, A., Hewitt, C.N. 1/11/2009 In: Environmental Science and Technology. 43, 21, p. 8338-8343. 6 p.
Journal article

Defining hybrid poplar (Populus deltoides x Populus trichocarpa) tolerance to ozone: identifying key parameters
Ryan, A., Cojocariu, C., Possell, M., Davies, B., Hewitt, N. 01/2009 In: Plant, Cell and Environment. 32, 1, p. 31-45. 15 p.
Journal article

Biogenic volatile organic compounds in the Earth system
Laothawornkitkul, J., Taylor, J.E., Paul, N.D., Hewitt, C.N. 2009
Scientific review

Concentrations and fluxes of biogenic volatile organic compounds above a Mediterranean macchia ecosystem in western Italy
Davison, B., Taipale, R., Langford, B., Misztal, P., Fares, S., Matteucci, G., Loreto, F., Cape, J.N., Rinne, J., Hewitt, C.N. 2009 In: Biogeosciences. 6, 8, p. 1655-1670. 16 p.
Journal article

Gas exchange and photosynthetic performance of the tropical tree Acacia nigrescens when grown in different CO2 concentrations
Possell, M., Hewitt, C.N. 2009 In: Planta. 229, 4, p. 837-846. 10 p.
Journal article

Isoprene synthesis protects transgenic tobacco plants from oxidative stress
Vickers, C.E., Possell, M., Cojocariu, C., Velikova, V.B., Laothawornkitkul, J., Ryan, A., Mullineaux, P.M., Hewitt, C.N. 2009 In: Plant, Cell and Environment. 32, 5, p. 520-531. 12 p.
Journal article

Mixing ratios and eddy covariance flux measurements of volatile organic compounds from an urban canopy (Manchester, UK)
Langford, B., Davison, B., Nemitz, E., Hewitt, C.N. 2009 In: Atmospheric Chemistry and Physics . 9, 6, p. 1971-1987. 17 p.
Journal article

Nitrogen management is essential to prevent tropical oil palm plantations from causing ground-level ozone pollution
Hewitt, C.N., Mackenzie, R., Di Carlo, P., Di Marco, C.F., Dorsey, J.R., Evans, M., Fowler, D., Gallagher, M.W., Hopkins, J.R., Jones, C.E., Langford, B., Lee, J.D., Lewis, A.C., Lim, S.F., McQuaid, J., Misztal, P., Moller, S.J., Monks, P.S., Nemitz, E., Oram, D.E., Owen, S.M., Phillips, G.J., Pugh, T., Pyle, J.A., Reeves, C.E., Ryder, J., Siong, J., Skiba, U., Stewart, D.J. 2009 In: Proceedings of the National Academy of Sciences. 106, 44, p. 18447-18451. 5 p.
Journal article

The role of isoprene in insect herbivory.
Laothawornkitkul, J., Paul, N.D., Vickers, C.E., Possell, M., Mullineaux, P.M., Hewitt, C.N., Taylor, J.E. 12/2008 In: Plant Signaling and Behavior. 3, 12, p. 1141-1142. 2 p.
Journal article

The effect of trade between China and the UK on national and global carbon dioxide emissions
Li, Y., Hewitt, C.N. 06/2008 In: Energy Policy. 36, 6, p. 1907-1914. 8 p.
Journal article

Assessing, mapping and quantifying the distribution of foliar biomass in Great Britain
Stewart, H., Hewitt, C.N., Bunce, R.G.H. 2008 In: Biomass and Bioenergy. 32, 9, p. 838-856. 19 p.
Journal article

Discrimination of plant volatile signatures by an electronic nose: a potential technology for plant pest and disease monitoring
Laothawornkitkul, J., Moore, J.P., Taylor, J.E., Possell, M., Gibson, T.D., Hewitt, C.N., Paul, N.D. 2008 In: Environmental Science and Technology. 42, 22, p. 8433-8439. 7 p.
Journal article

Isoprene emissions influence herbivore feeding decisions
Laothawornkitkul, J., Paul, N.D., Vickers, C.E., Possell, M., Taylor, J.E., Mullineaux, P.M., Hewitt, C.N. 2008 In: Plant, Cell and Environment. 31, 10, p. 1410-1415. 6 p.
Journal article

Quantifying the effect of urban tree planting on concentrations and depositions of PM10 in two UK conurbations
McDonald, A.G., Bealey, W.J., Fowler, D., Dragosits, U., Skiba, U., Smith, R.I., Donovan, R.G., Brett, H.E., Hewitt, C.N., Nemitz, E. 12/2007 In: Atmospheric Environment. 41, 38, p. 8455-8467. 13 p.
Journal article

Critical issues in trace gas biogeochemistry and global change
Beerling, D.J., Hewitt, C.N., Pyle, J.A., Raven, J.A. 07/2007 In: Philosophical Transactions A: Mathematical, Physical and Engineering Sciences . 365, 1856, p. 1629-1642. 14 p.
Journal article

A proton transfer reaction mass spectrometry based system for determining plant uptake of volatile organic compounds.
Tani, A., Kato, S., Kajii, Y., Wilkinson, M., Owen, S., Hewitt, C.N. 03/2007 In: Atmospheric Environment. 41, 8, p. 1736-1746. 11 p.
Journal article

Volatile organic compounds emissions in Norway spruce (Picea abies) in response to temperature changes
Filella, I., Wilkinson, M.J., Llusia, J., Hewitt, C.N., Penuelas, J. 2007 In: Physiologia Plantarum. 130, 1, p. 58-66. 9 p.
Journal article

Application of multiple wind-roses to improve the modelling of ground-level ozone in the UK
Strong, J., Whyatt, D., Hewitt, C.N. 12/2006 In: Atmospheric Environment. 40, 39, p. 7480-7493. 14 p.
Journal article

Circadian control of isoprene emissions from oil palm (Elaeis guineensis)
Wilkinson, M.J., Owen, S.M., Possell, M., Hartwell, J., Gould, P., Hall, A., Vickers, C., Hewitt, C.N. 09/2006 In: Plant Journal. 47, 6, p. 960-968. 9 p.
Journal article

Urban land classification and its uncertainties using principal component and cluster analyses: A case study for the UK West Midlands
Owen, S.M., Mackenzie, R., Bunce, R.G.H., Stewart, H., Donovan, R.G., Stark, G., Hewitt, C.N. 2006 In: Landscape and Urban Planning. 78, 4, p. 311-321. 11 p.
Journal article

The effects of glacial atmospheric CO2 concentrations and climate on isoprene emissions by vascular plants
Possell, M., Hewitt, C.N., Beerling, D.J. 01/2005 In: Global Change Biology. 11, 1, p. 60-69. 10 p.
Journal article

The effects of glacial atmospheric carbon dioxide levels and climate on isoprene emissions from vascular plants.
Hewitt, N., Beerling, D.J., Possell, M. 01/2005 In: Global Change Biology. 11, 1, p. 60-69. 10 p.
Journal article

Development and application of an urban tree air quality score for photochemical pollution episodes using the Birmingham, United Kingdom, area as a case study
Donovan, R.G., Stewart, H., Owen, S.M., Mackenzie, R., Hewitt, C.N. 2005 In: Environmental Science and Technology. 39, 17, p. 6730-6738. 9 p.
Journal article

Effect of water vapour pressure on monoterpene measurements using proton transfer reaction-mass spectrometry (PTR-MS)
Tani, A., Hayward, S., Hansel, A., Hewitt, C.N. 15/12/2004 In: International Journal of Mass Spectrometry. 239, 2-3, p. 161-169. 9 p.
Journal article

On-line analysis of volatile organic compound emissions from Sitka spruce (Picea sitchensis).
Hayward, S., Tani, A., Owen, S.M., Hewitt, C. 07/2004 In: Tree Physiology. 24, 7, p. 721-728. 8 p.
Journal article

Online analysis of volatile organic compound emissions from Sitka spruce (Picea sitchensis)
Hayward, S., Tani, A., Owen, S.M., Hewitt, C.N. 07/2004 In: Tree Physiology. 24, 7, p. 721-728. 8 p.
Journal article

Impact of rising CO2 on emissions of volatile organic compounds: isoprene emission from Phragmites australis growing at elevated CO2 in a natural carbon dioxide spring.
Scholefield, P.A., Doick, K.J., Herbert, B.M.J., Hewitt, C.N., Schnitzler, J.P., Pinelli, P., Loreto, F. 2004 In: Plant, Cell and Environment. 27, 4, p. 393-401. 9 p.
Journal article

A highly spatially and temporally resolved inventory for biogenic isoprene and monoterpene emissions ' model description and application to Great Britain.
Hewitt, C., Bunce, R.G.H., Steinbrecher, R., Stewart, H.E. 1/10/2003 In: Journal of Geophysical Research: Atmospheres. 108, D20
Journal article

Biogenic volatile organic compound flux from the UK West Midlands urban tree canopy.
Owen, S.M., Mackenzie, A.R., Stewart, H., Donovan, R., Hewitt, C. 08/2003 In: Ecological Applications. 13, 4, p. 927-938. 12 p.
Journal article

Measurement of monoterpenes and related compounds by proton transfer reaction-mass spectrometry.
Tani, A., Hayward, S., Hewitt, C. 15/01/2003 In: International Journal of Mass Spectrometry. 223/22, 1, p. 561-78. 484 p.
Journal article

Application of proton transfer reaction mass spectrometry for the monitoring and measurement of volatile organic compounds in the atmosphere.
Hewitt, C., Hayward, S., Tani, A. 2003 In: Journal of Environmental Monitoring. 5, 1, p. 1-7. 7 p.
Journal article

Eddy flux and leaf-level measurements of biogenic VOC emissions from Mopane woodlands of Botswana.
Greenberg, J., Guenther, A., Harley, P., Otter, L., Veenendahl, E., Hewitt, C., James, A., Owen, S.M. 2003 In: Journal of Geophysical Research: Atmospheres. 108, D13, p. 8466-8474. 9 p.
Journal article

Emission rates of C8-C15 VOCs from seaweed and sand in the inter-tidal zone at Mace Head, Ireland.
Sartin, J.H., Halsall, C.J., Hayward, S., Hewitt, C.N. 11/2002 In: Atmospheric Environment. 36, 34, p. 5311-5321. 11 p.
Journal article

Temporal patterns, sources and sinks of (C8-C16) hydrocarbons in the atmosphere of Mace Head, Ireland.
Sartin, J.H., Halsall, C.J., Robertson, L.A., Gonard, R.G., Mackenzie, A.R., Berresheim, H., Hewitt, C.N. 4/09/2002 In: Journal of Geophysical Research: Atmospheres. 107, D19
Journal article

Light dependency of VOC emissions from selected Mediterranean plant species.
Owen, S.M., Harley, P., Guenther, A., Hewitt, C. 07/2002 In: Atmospheric Environment. 36, 19, p. 3147-3159. 13 p.
Journal article

Monoterpene fluxes measured above a Japanese red pine forest at Oshiba plateau, Japan.
Tani, A., Nozoe, S., Aoli, M., Hewitt, C. 07/2002 In: Atmospheric Environment. 36, 21, p. 3391-3402. 12 p.
Journal article

Performance characteristics of a proton transfer reaction-mass spectrometer for measuring volatile organic compounds in ambient air.
Hayward, S., Hewitt, C., Sartin, J.H., Owen, S.M. 1/04/2002 In: Environmental Science and Technology. 36, 7, p. 1554-60. 1495 p.
Journal article

Influence of transport over a mountain ridge on the chemical composition of marine aerosols during the ACE-2 HILLCLOUD experiment.
Allen, A.G., Davison, B.M., James, J.D., Robinson, L., Harrison, R.M., Hewitt, C. 01/2002 In: Journal of Atmospheric Chemistry. 41, 1, p. 83-107. 25 p.
Journal article

Volatile organic compounds (VOCs) emitted from 40 Mediterranean plant species: VOC speciation and extrapolation to habitat scale.
Owen, S.M., Boissard, C., Hewitt, C. 11/2001 In: Atmospheric Environment. 35, 32, p. 5393-5409. 17 p.
Journal article

Monoterpene emissions from soil in a Sitka spruce forest.
Haywood, S., Muncy, R., James, A.E., Halsall, C.J., Hewitt, C.N. 08/2001 In: Atmospheric Environment. 35, 24, p. 4081-4087. 7 p.
Journal article

Determination of biogenic volatile organic compounds (C8–C16) in the coastal atmosphere at Mace Head, Ireland
Sartin, J., Halsall, C.J., Davison, W., Owen, S., Hewitt, C.N. 1/02/2001 In: Analytica Chimica Acta. 428, 1, p. 61-72. 12 p.
Journal article

Seasonal variations in VOC emission rates from gorse (Ulex europaeus).
Boissard, C., Cao, X., Juan, C.Y., Hewitt, C., Gallagher, M. 2001 In: Atmospheric Environment. 35, 5, p. 917-927. 11 p.
Journal article

The atmospheric chemistry of sulfur and nitrogen in power plant plumes.
Hewitt, C. 2001 In: Atmospheric Environment. 35, 7, p. 1155-1171. 17 p.
Journal article

The atmospheric chemistry of sulphur and nitrogen in power station plumes
Hewitt, C.N. 2001
Scientific review

Photochemical generation of secondary particles in the United Kingdom – discussion.
Rose, N., Derwent, R.G., Wallis, M., Hewitt, C., Stewart, H. 15/10/2000 In: Philosophical Transactions of the Royal Society of London A. 358, 1775, p. 2656-2657. 2 p.
Journal article

ACE-2 HILLCLOUD. An overview of the ACE-2 ground-based cloud experiment.
Bower, B.K.N., Choularton, T.W., Gallagher, M.W., Beswick, K.M., Flynn, M.J., Allen, A.G., Davison, B.M., James, J.D., Robertson, L., Harrison, R.M., Hewitt, C., Cape, J.N., Mcfadyen, G.G., Milford, C., Sutton, M.A., Martinsson, B.G., Frank, G., Swietlicki, E., Zhou, J., Berg, O.H., Mentes, B., Papaspiropoulos, G., Hansson, H.C., Leck, C., Kulmala, M., Aalto, P., Vakeva, M., Berner, A., Bizjak, M., Fuzzi, S., Laj, P., Facchini, M.C., Orsi, G., Ricci, L., Nielsen, M., Allan, B.J., Coe, H., Mcfiggans, G., Plane, J.M.C., Collett, J.L., Moore, K.F., Sherman, D.E. 04/2000 In: Tellus B. 52, 2, p. 750-778. 29 p.
Journal article

Assessment of a relaxed eddy accumulation for measurements of fluxes of biogenic volatile organic compounds: study over arable crops and a mature beech forest.
Gallagher, M.W., Clayborough, R., Beswick, K.M., Hewitt, C., Owen, S.M., Moncrieff, J., Pilegaard, K. 2000 In: Atmospheric Environment. 34, 18, p. 2887-2899. 13 p.
Journal article

Development of a calibration system to evaluate VOC losses in a branch enclosure.
Pompe, M., Owen, S.M., Hewitt, C., Basa, H., Veber, M. 2000 In: Journal of Environmental Monitoring. 2, p. 133-138. 6 p.
Journal article

Extrapolating branch enclosure measurements to estimates of regional scale biogenic VOC fluxes in the northwestern Mediterranean basin.
Owen, S.M., Hewitt, C. 2000 In: Journal of Geophysical Research: Atmospheres. 105, D9, p. 11573-11583. 11 p.
Journal article

Observations of new particle production in the atmosphere of a moderately polluted site in eastern England.
Harrison, R.M., Grenfell, J.L., Savage, N.H., Allen, A.G., Chemitshaw, K.C., Penkett, S., Hewitt, C., Davison, B. 2000 In: Journal of Geophysical Research: Atmospheres. 105, D14, p. 17819-17832. 14 p.
Journal article

Quasi-Lagrangian investigation into dimethyl sulfide oxidation in maritime air using a combination of measurements and model.
James, J.D., Harrison, R.M., Savage, N.H., Allen, A.G., Grenfell, J.L., Allan, B.J., Plane, J.M.C., Hewitt, C., Davison, B., Robertson, L. 2000 In: Journal of Geophysical Research: Atmospheres. 105, D21, p. 26379-26392. 14 p.
Journal article

Dimethyl sulfide and its oxidation products at two sites in Brittany (France).
Putaud, J.P., Davison, B.M., Watts, S.F., Mihalopoulos, N., Ngygen, B.C., Hewitt, C. 02/1999 In: Atmospheric Environment. 33, 4, p. 647-659. 13 p.
Journal article

An analysis of rapid increases in condensation nuclei concentrations at a remote coastal site in western Ireland.
Grenfell, J.L., Harrison, R.M., Allen, A.G., Shi, J.P., Penkett, S.A., O’Dowd, C.D., Smith, M.H., Hill, M.K., Robertson, L., Hewitt, C., Davison, B.M., Lewis, A.C., Creasey, D.J., Heard, D.E., Hebestreit, K., Alicke, B., James, J. 1999 In: Journal of Geophysical Research: Atmospheres. 104, D11, p. 13771-13380. 392 p.
Journal article

Inventorying emissions from nature in Europe
Simpson, D., Winiwarter, W., Borjesson, G., Cinderby, S., Ferreiro, A., Guenther, A., Hewitt, C., Janson, R., Khalil, M.A., Owen, S., Pierce, T.E., Puxbaum, H., Shearer, M., Skiba, U., Steinbrecher, R., Tarrason, L., Oquist, M.G. 1999 In: Journal of Geophysical Research: Atmospheres. 104, D7, p. 8113-8152. 40 p.
Journal article

Vegetation-climate feedbacks in a greenhouse world - discussion.
Wagner, A., Woodward, F.I., Mulligan, M., Hewitt, C. 29/01/1998 In: Philosophical Transactions B: Biological Sciences. 353, 1365, p. 38-39. 2 p.
Journal article

Field studies of isoprene emissions from vegetation in the north-western Mediterranean region.
Owen, S.M., Boissard, C., Hagenlocher, B., Hewitt, C. 1998 In: Journal of Geophysical Research: Atmospheres. 103, D19, p. 25499-25511. 13 p.
Journal article

Sorption of trace metasl (Cu, Pb, Zn) by suspended lake particles in artificial (0.05 M NaNO3) and natural (Esthwaite Water) freshwaters.
Hamilton-Taylor, J., Guisti, L., Davison, W., Tych, W., Hewitt, C. 21/02/1997 In: Colloids and Surfaces A: Physicochemical and Engineering Aspects. 120, 1-3, p. 205-219. 15 p.
Journal article

Effect of habitat and age on variations in volatile organic compound (VOC) emissions from Quercus ilex and Pinus pinea.
Street, R.A., Owen, S., Duckham, S.C., Boissard, C., Hewitt, C. 01/1997 In: Atmospheric Environment. 31, Supple, p. 89-100. 12 p.
Journal article

An overview of the Castelporziano experiments.
Seufert, G., Bartzis, J.G., Bomboi-Mingarro, T., Ciccioli, P., Cieslik, S., Dlugi, R., Foster, P., Hewitt, C., Kesselmeier, J., Kotzias, D., Lenz, R., Manes, F., Perez-Pastor, T., Steinbrecher, R., Torres, L., Valentini, R., Versino, B. 1997 In: Atmospheric Environment. 31, Supple, p. 5-17. 13 p.
Journal article

Biogenic emissions of volatile organic compounds from gorse (Ulex europaeus): branch and canopy scale flux measurements.
Cao, X., Boissard, C., Juan, A.J., Hewitt, C. 1997 In: Journal of Geophysical Research: Atmospheres. 102, D15, p. 18903-18915. 13 p.
Journal article

Biogenic sulphur emissions and inferred non-sea-salt-sulphate cloud condensation nuclei in and around Antarctica.
O'Dowd, C., Lowe, J.A., Smith, M.H., Davison, B., Hewitt, C., Harrison, R.M. 1997 In: Journal of Geophysical Research: Atmospheres. 102, D11, p. 12839-12854. 16 p.
Journal article

Determination and accuracy of VOC fluxes above a pine/oak forest at Castelporziano.
Schween, J.H., Dlugi, R., Hewitt, C., Foster, P. 1997 In: Atmospheric Environment. 31, Supple, p. 199-216. 18 p.
Journal article

Field studies of dimethyl sulfide and its oxidation products in the atmosphere.
Hewitt, C., Davison, B. 1997 In: Philosophical Transactions B: Biological Sciences. 352, 1350, p. 183-189. 7 p.
Journal article

Isoprene and monoterpene emissions from a eucalyptus plantation in Portugal
Street, R.A., Hewitt, C., Mennicken, S. 1997 In: Journal of Geophysical Research: Atmospheres. 102, D13, p. 15875-15887. 13 p.
Journal article

Screening of 18 Mediterranean plant species for volatile organic compound emissions.
Owen, S., Boissard, C., Street, R.A., Duckham, S.C., Csiky, O., Hewitt, C. 1997 In: Atmospheric Environment. 31, Supple, p. 101-118. 18 p.
Journal article

Dimethyl sulfide and its oxidation products in the atmosphere of the Atlantic and Southern Oceans.
Davison, B.M., O'Dowd, C.D., Hewitt, C., Smith, M.H., Harrison, R.M., Peel, D.A., Wolf, E., Mulvaney, R., Schwikowski, M., Baltenspergert, U. 05/1996 In: Atmospheric Environment. 30, 10-11, p. 1895-1906. 12 p.
Journal article

Hydrogen peroxide and organic hydroperoxide concentrations in air in a Eucalyptus forest in central Portugal.
Jackson, A.V., Hewitt, C. 03/1996 In: Atmospheric Environment. 30, 6, p. 819-830. 12 p.
Journal article

Dimethyl sulfide, methane sulfonic acid and physico-chemical aerosol properties in Atlantic air from the United Kingdom to Halley Bay.
Davison, B.M., Hewitt, C., O'Dowd, C.D., Lowe, J.A., Smith, M.H., Schwikowski, M., Baltensperger, U., Harrison, R.M. 1996 In: Journal of Geophysical Research: Atmospheres. 101, D17, p. 22855-22874. 20 p.
Journal article

Laboratory and field studies of biogenic volatile organic compound emissions from Sitka spruce (Picea sitchensis Bong.) in the United Kingdom.
Street, R.A., Duckham, S.C., Hewitt, C.N. 1996 In: Journal of Geophysical Research: Atmospheres. 101, D17, p. 22799-22806. 8 p.
Journal article

Measurement of hydrocarbon and carbon dioxide fluxes from a Sitka spruce forest using micrometeorological techniques.
Beverland, J.I., Milne, R., Boissard, C., O'Neill, D.H., Moncrieff, J.B., Hewitt, C. 1996 In: Journal of Geophysical Research: Atmospheres. 101, D17, p. 22807-22815. 9 p.
Journal article

Physicochemical properties of atmospheric aerosol at South UIST.
Lowe, J.A., Smith, M.H., Davison, B.M., Benson, S.E., Hill, M.K., O'dowd, C.D., Harrison, R.M., Hewitt, C.N. 1996 In: Atmospheric Environment. 30, 22, p. 3765-3776. 12 p.
Journal article

Biogenic emissions in Europe 1. Estimates and uncertainties
Simpson, D., Guenther, A., Hewitt, C.N., Steinbrecher, R. 20/11/1995 In: Journal of Geophysical Research: Atmospheres. 100, D11, p. 22875-22890. 16 p.
Journal article

Study of the responses of a gas chromatography—reduction gas detector system to gaseous hydrocarbons under different conditions.
Cao, X., Hewitt, C.N., Waterhouse, K.S. 20/01/1995 In: Analytica Chimica Acta. 300, 1-3, p. 193-200. 8 p.
Journal article

A global model of natural volatile organic compound emissions
Guenther, A., Hewitt, C.N., Erickson, D., Fall, R., Geron, C., Graedel, T., Harley, P., Klinger, L., Lerdau, M., Mckay, W.A., Pierce, T., Scholes, B., Steinbrecher, R., Tallamraju, R., Taylor, J., Zimmerman, P. 1995 In: Journal of Geophysical Research: Atmospheres. 100, D5, p. 8873-8892. 20 p.
Journal article

Atmospheric VOCs from natural sources.
Hewitt, C.N., Cao, X., Boissard, C., Duckham, S.C. 1995 In: Issues in Environmental Science and Technology. 4, p. 17-36. 20 p.
Journal article

Detection methods for the analysis of biogenic non-methane hydrocarbons in air.
Cao, X., Hewitt, C.N. 1995 In: Journal of Chromatography A. 710, 1, p. 39-45. 7 p.
Journal article

Effects of reactive hydrocarbons and hydrogen-peroxide on antioxidant activity in cherry leaves.
Terry, G.M., Stokes, N.J., Lucas, P.W., Hewitt, C. 1995 In: Environmental Pollution. 88, 1, p. 19-26. 8 p.
Journal article

Exposure to isoprene promotes flowering in plants.
Terry, G.M., Stokes, N.J., Hewitt, C., Mansfield, T.A. 1995 In: Journal of Experimental Botany. 46, 10, p. 1629-1631. 3 p.
Journal article

Gas chromatographic determination of volatile alkenes with on-column bromination and electron-capture detection.
Cao, X., Hewitt, C.N. 1995 In: Journal of Chromatography A. 690, 2, p. 187-195. 9 p.
Journal article

PAHs in Air Adjacent to Two Inland Water Bodies.
Gardner, B., Hewitt, C.N., Jones, K.C. 1995 In: Environmental Science and Technology. 29, 9, p. 2405-2413. 9 p.
Journal article

Kinetics of the dissolution of lead and zinc from rural atmospheric aerosols in freshwater and synthetic solutions.
Davison, W., Arewgoda, C.M., Hamilton-Taylor, J., Hewitt, C. 08/1994 In: Water Research. 28, 8, p. 1703-1709. 7 p.
Journal article

Study of the Degradation by Ozone of Adsorbents and of Hydrocarbons Adsorbed during the Passive Sampling of Air.
Cao, X., Hewitt, C. 05/1994 In: Environmental Science and Technology. 28, 5, p. 757-762. 6 p.
Journal article

A model of environmental behaviour of contaminated dust and its application to determining dust fluxes and residence times.
Allott, R.W., Kelly, M., Hewitt, C. 02/1994 In: Atmospheric Environment. 28, 4, p. 679-687. 9 p.
Journal article

Elucidation of the tropospheric reactions of biogenic sulfur species from a field measurement campaign in NW Scotland.
Davison, B., Hewitt, C. 02/1994 In: Chemosphere. 28, 3, p. 543-557. 15 p.
Journal article

An exposure system for the calibration of passive samplers to volatile organic compounds at low (PPBV) concentrations.
Cao, X.L., Hewitt, C. 1994 In: Journal of the Air and Waste Management Association. 44, 11, p. 1299-1302. 4 p.
Journal article

Artefacts in sorption experiments with trace metals.
Giusti, L., Hamilton-Taylor, J., Davison, W., Hewitt, C. 1994 In: Science of the Total Environment. 152, 3, p. 227-238. 12 p.
Journal article

Determination of reactive hydrocarbons by capillary gas chromatography with the reduction gas detector.
Cao, X., Hewitt, C., Waterhouse, K.S. 1994 In: Journal of Chromatography A. 679, 1, p. 115-121. 7 p.
Journal article

The determination of hydroxyl radical concentrations in environmental chambers using electron spin resonance.
Stokes, N.J., Tabner, B.J., Hewitt, C. 1994 In: Chemosphere. 28, 5, p. 999-1008. 10 p.
Journal article

The effects of reactive hydrocarbons on plants.
Stokes, N.J., Terry, G., Tabner, B.J., Hewitt, C. 1994 In: Proceedings of the Royal Society of Edinburgh Series B. 102, p. 307-311. 5 p.
Journal article

The design and application of a novel automated sampler for wet and dry deposition to water surfaces.
Gardner, B., Hewitt, C. 7/08/1993 In: Science of the Total Environment. 135, 1-3, p. 55-66. 12 p.
Journal article

Evaluation of tenax-GR adsorbent for the passive sampling of volatile organic compounds at low concentrations.
Cao, X., Hewitt, C. 08/1993 In: Atmospheric Environment: Part A - General Topics. 27, 12, p. 1865-1872. 8 p.
Journal article

The solubility and partitioning of atmospherically derived trace metals in artificial and natural waters: a review
Giusti, L., Yang, Y., Hewitt, C., Hamilton-Taylor, J., Davison, W. 07/1993 In: Atmospheric Environment: Part A - General Topics. 27, 10, p. 1567-1578. 12 p.
Journal article

Controlled environment fumigation chambers for the study of reactive air pollutant effects on plants.
Stokes, N.J., Lucas, P.W., Hewitt, C. 04/1993 In: Atmospheric Environment: Part A - General Topics. 27, 5, p. 679-684. 6 p.
Journal article

The trace metal dissolution kinetics of three rural atmospheric aerosols in a range of natural fresh water types.
Hamilton-Taylor, J., Yang, Y., Arewgoda, C.M., Hewitt, C., Davison, W. 02/1993 In: Water Research. 27, 2, p. 243-254. 12 p.
Journal article

Environmental chemistry comes of age.
Davison, W., Hewitt, C. 1993 In: Education in Chemistry. 30, p. 48-50. 3 p.
Journal article

Passive sampling and gas chromatographic determination of low concentrations of reactive hydrocarbons in ambient air with reduction gas detector.
Cao, X., Hewitt, C. 1993 In: Journal of Chromatography A. 648, 1, p. 191-197. 7 p.
Journal article

The occurrence of high indoor radon levels in carboniferous bedrock areas of NW England.
Rowe, J.E., Kelly, M., Hewitt, C. 1993 In: Radiation Protection Dosimetry. 46, 3, p. 201-205. 5 p.
Journal article

Thermal desorption efficiencies for different adsorbate/adsorbent systems typically used in air monitoring programmes.
Cao, X., Hewitt, C. 1993 In: Chemosphere. 27, 5, p. 695-705. 11 p.
Journal article

A qualitative assessment of the emission of non-methane hydrocarbon compounds from the biosphere to the atmosphere in the UK: present knowledge and uncertainties.
Hewitt, C., Street, R.A. 12/1992 In: Atmospheric Environment: Part A - General Topics. 26, 17, p. 3069-3077. 9 p.
Journal article

Ozone-hydrocarbon interactions in plants.
Salter, L., Hewitt, C. 12/1992 In: Phytochemistry. 31, p. 4045-4050. 6 p.
Journal article

Behavior of urban dust contaminated by Chernobyl fallout: environmental half-lives and transfer coefficients.
Allott, R.W., Kelly, M.R., Hewitt, C. 11/1992 In: Environmental Science and Technology. 26, 11, p. 2142-2147. 6 p.
Journal article

Natural sulphur species from the North Atlantic and their contribution to the United Kingdom sulphur budget
Davison, B., Hewitt, C. 20/02/1992 In: Journal of Geophysical Research: Atmospheres. 97, D2, p. 2475-2485. 11 p.
Journal article

Emissions of volatile organic compounds from vegetation and their implications for atmospheric chemistry.
Fehsenfeld, F., Calvert, J., Fall, R., Goldan, P., Guenther, A.B., Hewitt, C., Lamb, B., Liu, S., Trainer, M., Westberg, H., Zimmerman, P. 1992 In: Global Biogeochemical Cycles. 6, 4, p. 389-430. 42 p.
Journal article

Modelling and measurement of the dispersion of radioactive emissions from a nuclear fuel fabrication plant in the U.K.
Al-Khayat, T.A.H., van Eygen, B., Hewitt, C., Kelly, M.R. 1992 In: Atmospheric Environment: Part A - General Topics. 26, 17, p. 3079-3087. 9 p.
Journal article

Removal rates of selected pollutants in the runoff waters from a major rural highway.
Hewitt, C., Rashed, M.B. 1992 In: Water Research. 26, 3, p. 311-319. 9 p.
Journal article

Spatial distributions of nitrogen dioxide in an urban area.
Hewitt, C. 1992 In: Atmospheric Environment. Part B. Urban Atmosphere. 25, 3, p. 429-434. 6 p.
Journal article

Trapping efficiencies of capillary cold traps for C2-C10 hydrocarbons.
Cao, X., Hewitt, C. 1992 In: Journal of Chromatography A. 627, 1-2, p. 219-226. 8 p.
Journal article

Understanding plant - ozone interactions.
Terry, G., Hewitt, C. 1992 In: Environmental Science and Technology. 26, p. 1890-1891. 2 p.
Journal article

APPLICATION OF PASSIVE SAMPLERS TO THE MONITORING OF LOW CONCENTRATION ORGANIC VAPORS IN INDOOR AND AMBIENT AIR - A REVIEW
CAO, X.L., Hewitt, C.N. 11/1991
Scientific review

FORMATION AND OCCURRENCE OF ORGANIC HYDROPEROXIDES IN THE TROPOSPHERE - LABORATORY AND FIELD OBSERVATIONS
Hewitt, C.N., Kok, G.L. 02/1991 In: Journal of Atmospheric Chemistry. 12, 2, p. 181-194. 14 p.
Journal article

A METHOD FOR THE SAMPLING AND REMOVAL OF IONIC ALKYLLEAD COMPOUNDS FROM AQUEOUS-SOLUTION USING ION-EXCHANGE MEDIA
Hewitt, C.N., METCALFE, P.J., STREET, R.A. 01/1991 In: Water Research. 25, 1, p. 91-94. 4 p.
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THE DEPOSITION OF SELECTED POLLUTANTS ADJACENT TO A MAJOR RURAL HIGHWAY
Hewitt, C.N., RASHED, M.B. 1991 In: Atmospheric Environment: Part A - General Topics. 25, 5-6, p. 979-983. 5 p.
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CHEMISTRY OF OZONE DAMAGE TO PLANTS
Hewitt, C.N., Lucas, P., WELLBURN, A.R., FALL, R. 6/08/1990 In: Chemistry and Industry. 15, p. 478-481. 4 p.
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AN INTEGRATED BUDGET FOR SELECTED POLLUTANTS FOR A MAJOR RURAL HIGHWAY
Hewitt, C.N., RASHED, M.B. 04/1990 In: Science of the Total Environment. 93, p. 375-384. 10 p.
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ENVIRONMENTAL RADON - A BRIEF REVIEW
Hewitt, C.N., Kelly, M. 04/1990
Scientific review

THE ENVIRONMENTAL HALF-LIVES AND MEAN RESIDENCE TIMES OF CONTAMINANTS IN DUST FOR AN URBAN-ENVIRONMENT - BARROW-IN-FURNESS
ALLOTT, R.W., Hewitt, C.N., KELLY, M.R. 04/1990 In: Science of the Total Environment. 93, p. 403-410. 8 p.
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SOIL AND STREET DUST HEAVY-METAL CONCENTRATIONS IN AND AROUND CUENCA, ECUADOR
Hewitt, C.N., CANDY, G.B.B. 1990 In: Environmental Pollution. 63, 2, p. 129-136. 8 p.
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