Dr Ryan Hossaini

NERC Research Fellow

Research Interests

Ryan's research examines how changes in the chemistry and composition of Earth’s atmosphere influence climate. This involves the development and application of state-of-the-art numerical models, run on supercomputers, which simulate the past, present and future state of the atmosphere.

See recent work on (i.) the climate-relevance of naturally-occurring very short-lived substances, published in Nature Geoscience and (ii.) rising levels of ozone-depleting chemicals not controlled by the UN Montreal Protocol, published in Geophysical Research Letters and Nature Communications.

Detecting recovery of the stratospheric ozone layer
Chipperfield, M.P., Bekki, S., Dhomse, S., Harris, N.R.P., Hassler, B., Hossaini, R., Steinbrecht, W., Thiéblemont, R., Weber, M. 14/09/2017 In: Nature. 549, 7671, p. 211-218. 8 p.
Journal article

The increasing threat to stratospheric ozone from dichloromethane
Hossaini, R., Chipperfield, M.P., Montzka, S.A., Leeson, A.A., Dhomse, S., Pyle, J. 27/06/2017 In: Nature Communications. 8, 9 p.
Journal article

A new Differential Optical Absorption Spectroscopy instrument to study atmospheric chemistry from a high- altitude unmanned aircraft
Stutz, J., Werner, B., Spolaor, M., Scalone, L., Festa, J., Tsai, C., Cheung, R., Colosimo, S.F., Tricoli, U., Raecke, R., Hossaini, R., Chipperfield, M.P., Feng, W., Gao, R., Hintsa, E.J., Elkins, J., Moore, F.L., Daube, B., Pittman, J., Wofsy, S., Pfeilsticker, K. 15/03/2017 In: Atmospheric Measurement Techniques. 10, 3, p. 1017-1042. 26 p.
Journal article

Probing the subtropical lowermost stratosphere and the tropical upper troposphere and tropopause layer for inorganic bromine
Werner, B., Stutz, J., Spolaor, M., Scalone, L., Raecke, R., Festa, J., Colosimo, S.F., Cheung, R., Tsai, C., Hossaini, R., Chipperfield, M.P., Taverna, G.S., Feng, W., Elkins, J., Fahey, D., Gao, R., Hintsa, E.J., Thornberry, T.D., Moore, F.L., Navarro, M.A., Atlas, E., Daube, B.C., Pittman, J., Wofsy, S., Pfeilsticker, K. 25/01/2017 In: Atmospheric Chemistry and Physics . 17, 2, p. 1161-1186. 26 p.
Journal article

Model sensitivity studies of the decrease in atmospheric carbon tetrachloride
Chipperfield, M.P., Liang, Q., Rigby, M., Hossaini, R., Montzka, S.A., Dhomse, S., Feng, W., Prinn, R.G., Weiss, R.F., Harth, C.M., Salameh, P.K., Mühle, J., O'Doherty, S., Young, D., Simmonds, P.G., Krummel, P.B., Frazer, P.J., Steele, L.P., Happell, J.D., Rhew, R.C., Butler, J., Yvon-Lewis, S., Hall, B., Nance, D., Moore, F., Miller, B.R., Elkins, J.W., Harrison, J.J., Boone, C.D., Atlas, E.L., Mahieu, E. 20/12/2016 In: Atmospheric Chemistry and Physics . 16, 24, p. 15741-15754. 14 p.
Journal article

A global model of tropospheric chlorine chemistry: organic versus inorganic sources and impact on methane oxidation
Hossaini, R., Chipperfield, M.P., Saiz-Lopez, A., Fernandez, R., Monks, S., Feng, W., Brauer, P., von Glasow, R. 16/12/2016 In: Journal of Geophysical Research: Atmospheres. 121, 23, p. 14271-14297. 27 p.
Journal article

A multi-model intercomparison of halogenated very short-lived substances (TransCom-VSLS): inking oceanic emissions and tropospheric transport for a reconciled estimate of the stratospheric source gas injection of bromine
Hossaini, R., Patra, P.K., Leeson, A.A., Krysztofiak, G., Abraham, N.L., Archibald, A.T., Aschmann, J., Atlas, E.L., Belikov, D.A., Bönisch, H., Carpenter, L.J., Dhomse, S., Dorf, M., Engel, A., Feng, W., Fuhlbrügge, S., Griffiths, P.T., Harris, N.R.P., Hommel, R., Keber, T., Krüger, K., Lennartz, S.T., Maksyutov, S., Mantle, H., Mills, G.P., Montzka, S.A., Moore, F., Navarro, M.A., Oram, D.E., Pfeilsticker, K., Pyle, J.A., Quack, B., Saikawa, E., Saiz-Lopez, A., Sala, S., Sinnhuber, B., Taguchi, S., Tegtmeier, S., Lidster, R.T., Ziska, F. 26/07/2016 In: Atmospheric Chemistry and Physics . 16, 14, p. 9163-9187. 25 p.
Journal article

On the ambiguous nature of the 11year solar cycle signal in upper stratospheric ozone
Dhomse, S.S., Chipperfield, M.P., Damadeo, R.P., Zawodny, J.M., Ball, W.T., Feng, W., Hossaini, R., Mann, G.W., Haigh, J.D. 16/07/2016 In: Geophysical Research Letters. 43, 13, p. 7241-7249. 9 p.
Journal article

Modelling marine emissions and atmospheric distributions of halocarbons and dimethyl sulfide: the influence of prescribed water concentration vs. prescribed emissions
Lennartz, S.T., Krysztofiak, G., Marandino, C.A., Sinnhuber, B.M., Tegtmeier, S., Ziska, F., Hossaini, R., Krüger, K., Montzka, S.A., Atlas, E., Oram, D.E., Keber, T., Bönisch, H., Quack, B. 22/10/2015 In: Atmospheric Chemistry and Physics . 15, 20, p. 11753-11772. 20 p.
Journal article

Growth in stratospheric chlorine from short-lived chemicals not controlled by the Montreal Protocol
Hossaini, R., Chipperfield, M.P., Saiz-Lopez, A., Harrison, J.J., von Glasow, R., Sommariva, R., Atlas, E., Navarro, M., Montzka, S.A., Feng, W., Dhomse, S., Harth, C., Mühle, J., Lunder, C., O'Doherty, S., Young, D., Reimann, S., Vollmer, M.K., Krummel, P.B., Bernath, P.F. 1/07/2015 In: Geophysical Research Letters. 42, 11, p. 4573-4580. 8 p.
Journal article

Reaction between CH3O2 and BrO Radicals: a new source of upper troposphere lower stratosphere hydroxyl radicals
Shallcross, D.E., Leather, K.E., Bacak, A., Xiao, P., Lee, E.P.F., Ng, M., Mok, D.K.W., Dyke, J.M., Hossaini, R., Chipperfield, M.P., Khan, M.A.H., Percival, C.J. 14/05/2015 In: Journal of Physical Chemistry A. 119, 19, p. 4618-4632. 15 p.
Journal article

Revisiting the hemispheric asymmetry in midlatitude ozone changes following the Mount Pinatubo eruption: a 3-D model study
Dhomse, S.S., Chipperfield, M.P., Feng, W., Hossaini, R., Mann, G.W., Santee, M.L. 28/04/2015 In: Geophysical Research Letters. 42, 8, p. 3038-3047. 10 p.
Journal article

Efficiency of short-lived halogens at influencing climate through depletion of stratospheric ozone
Hossaini, R., Chipperfield, M.P., Montzka, S.A., Rap, A., Dhomse, S., Feng, W. 03/2015 In: Nature Geoscience. 8, 3, p. 186-190. 5 p.
Journal article

Recent Northern Hemisphere stratospheric HCl increase due to atmospheric circulation changes
Mahieu, E., Chipperfield, M.P., Notholt, J., Reddmann, T., Anderson, J., Bernath, P.F., Blumenstock, T., Coffey, M.T., Dhomse, S.S., Feng, W., Franco, B., Froidevaux, L., Griffith, D.W.T., Hannigan, J.W., Hase, F., Hossaini, R., Jones, N.B., Morino, I., Murata, I., Nakajima, H., Palm, M., Paton-Walsh, C., Russell, J.M., Schneider, M., Servais, C., Smale, D., Walker, K.A. 6/11/2014 In: Nature. 515, 7525, p. 104-107. 4 p.
Journal article

Constraining the N2O5 UV absorption cross section from spectroscopic trace gas measurements in the tropical mid-stratosphere
Kritten, L., Butz, A., Chipperfield, M.P., Dorf, M., Dhomse, S., Hossaini, R., Oelhaf, H., Prados-Roman, C., Wetzel, G., Pfeilsticker, K. 16/09/2014 In: Atmospheric Chemistry and Physics . 14, 18, p. 9555-9566. 12 p.
Journal article

Update on Ozone-Depleting Substances (ODSs) and Other Gases of Interest to the Montreal Protocol: Chapter 1
Carpenter, L., Reimann, S., Burkholder, J., Clerbaux, C., Hall, B., Hossaini, R., Laube, J., Yvon-Lewis, S. 2014 In: Scientific Assessment of Ozone Depletion: 2014. Geneva, Switzerland : World Meteorological Organization
Chapter (peer-reviewed)

The contribution of oceanic methyl iodide to stratospheric iodine
Tegtmeier, S., Krueger, K., Quack, B., Atlas, E., Blake, D.R., Boenisch, H., Engel, A., Hepach, H., Hossaini, R., Navarro, M.A., Raimund, S., Sala, S., Shi, Q., Ziska, E. 9/12/2013 In: Atmospheric Chemistry and Physics . 13, 23, p. 11869-11886. 18 p.
Journal article

Evaluating global emission inventories of biogenic bromocarbons
Hossaini, R., Mantle, H., Chipperfield, M.P., Montzka, S.A., Hamer, P., Ziska, E., Quack, B., Krueger, K., Tegtmeier, S., Atlas, E., Sala, S., Engel, A., Boenisch, H., Keber, T., Oram, D., Mills, G., Ordonez, C., Saiz-Lopez, A., Warwick, N., Liang, Q., Feng, W., Moore, E., Miller, B.R., Marecal, V., Richards, N.A.D., Dorf, M., Pfeilsticker, K. 6/12/2013 In: Atmospheric Chemistry and Physics . 13, 23, p. 11819-11838. 20 p.
Journal article

Atmospheric test of the J(BrONO2)/k(BrO+NO2) ratio: implications for total stratospheric Br-y and bromine-mediated ozone loss
Kreycy, S., Camy-Peyret, C., Chipperfield, M.P., Dorf, M., Feng, W., Hossaini, R., Kritten, L., Werner, B., Pfeilsticker, K. 2/07/2013 In: Atmospheric Chemistry and Physics . 13, 13, p. 6263-6274. 12 p.
Journal article

Modelling future changes to the stratospheric source gas injection of biogenic bromocarbons
Hossaini, R., Chipperfield, M.P., Dhomse, S., Ordonez, C., Saiz-Lopez, A., Abraham, N.L., Archibald, A., Braesicke, P., Telford, P., Warwick, N., Yang, X., Pyle, J. 28/10/2012 In: Geophysical Research Letters. 39, 20, 4 p.
Journal article

The contribution of natural and anthropogenic very short-lived species to stratospheric bromine
Hossaini, R., Chipperfield, M.P., Feng, W., Breider, T.J., Atlas, E., Montzka, S.A., Miller, B.R., Moore, F., Elkins, J. 5/01/2012 In: Atmospheric Chemistry and Physics . 12, 1, p. 371-380. 10 p.
Journal article

Impact of deep convection and dehydration on bromine loading in the upper troposphere and lower stratosphere
Aschmann, J., Sinnhuber, B., Chipperfield, M.P., Hossaini, R. 22/03/2011 In: Atmospheric Chemistry and Physics . 11, 6, p. 2671-2687. 17 p.
Journal article

Bromoform and dibromomethane in the tropics: a 3-D model study of chemistry and transport
Hossaini, R., Chipperfield, M.P., Monge-Sanz, B.M., Richards, N.A.D., Atlas, E., Blake, D.R. 25/01/2010 In: Atmospheric Chemistry and Physics . 10, 2, p. 719-735. 17 p.
Journal article