Sherwen, Dr Tomás
Researcher
-
University of York
Wolfson Atmospheric Chemistry Laboratory
Department of Chemistry
University of York
Heslington
York
YO10 5DD
- https://orcid.org/0000-0002-3006-3876
- +44 190 432 4758
- https://www.york.ac.uk/chemistry/staff/resstaff/sherwent/
- ■
- Atmospheric Composition
To face up to the key issues confronting our society, of air-quality and climate change, we need to bring our chemical and physical knowledge to bear. This chemistry and physics controls the composition of the air we breathe in the troposphere and the concentrations of key air-quality and climate gases. To be able to predict the composition of the atmosphere in many locations at once we need to understand all processes acting on chemical species from emissions, their transport, through to transformations in the gas- and aerosol- phase, to loss to rain and surfaces.
My interests are in trying to understand the composition of the troposphere using numerical models and comparing their predictions to observations. I use and develop the community owned GEOS-Chem chemical transport model to predict and analyse composition at regional and global scales. By comparing with observations and developing models iteratively, we can seek answers to key questions for society and our planet such as air-quality and climate change.

Publications
- Zhu, Lei; Jacob, Daniel J.; Eastham, Sebastian D.; Sulprizio, Melissa P.; Wang, Xuan; Sherwen, Tomás; Evans, Mathew J.; Chen, Qianjie; Alexander, Becky; Koenig, Theodore K.; Volkamer, Rainer; Huey, Gregory L.; Le Breton, Michael; Bannan, Thomas J.; Percival, Carl J.; Effect of sea-salt aerosol on tropospheric bromine chemistry. Atmospheric Chemistry And Physics Discussions 1--17, [doi:10.5194/acp-2018-1239] Nov 2018
- Hu, Lu; Keller, Christoph A.; Long, Michael S.; Sherwen, Tomás; Auer, Benjamin; da Silva, Arlindo; Nielsen, Jon E.; Pawson, Steven; Thompson, Matthew A.; Trayanov, Atanas L.; Travis, Katherine R.; Grange, Stuart K.; Evans, Mathew J.; Jacob, Daniel J.; Global simulation of tropospheric chemistry at 12.5{\&}amp$\mathsemicolon$thinsp$\mathsemicolon$km resolution: performance and evaluation of the {GEOS}-Chem chemical module (v10-1) within the {NASA} {GEOS} Earth system model ({GEOS}-5 {ESM}). Geoscientific Model Development, 11 (11) , 4603--4620, [doi:10.5194/gmd-11-4603-2018] Nov 2018
- Legrand, Michel; McConnell, Joseph R.; Preunkert, Susanne; Arienzo, Monica; Chellman, Nathan; Gleason, Kelly; Sherwen, Tomás; Evans, Mat J.; Carpenter, Lucy J.; Alpine ice evidence of a three-fold increase in atmospheric iodine deposition since 1950 in Europe due to increasing oceanic emissions. Proceedings Of The National Academy Of Sciences 201809867, [doi:10.1073/pnas.1809867115] Nov 2018
- Hu, Lu; Keller, Christoph A.; Long, Michael S.; Sherwen, Tomás; Auer, Benjamin; da Silva, Arlindo; Nielsen, Jon E.; Pawson, Steven; Thompson, Matthew A.; Trayanov, Atanas L.; Travis, Katherine R.; Grange, Stuart K.; Evans, Mathew J.; Jacob, Daniel J.; Global simulation of tropospheric chemistry at 12.5{\&}amp$\mathsemicolon$thinsp$\mathsemicolon$km resolution: performance and evaluation of the {GEOS}-Chem chemical module (v10-1) within the {NASA} {GEOS} Earth System Model ({GEOS}-5 {ESM}). Geoscientific Model Development Discussions 1--32, [doi:10.5194/gmd-2018-111] May 2018
- Kasibhatla, Prasad; Sherwen, Tomás; Evans, Mathew J.; Carpenter, Lucy J.; Reed, Chris; Alexander, Becky; Chen, Qianjie; Sulprizio, Melissa; Lee, James D.; Read, Katie A.; Bloss, William; Crilley, Leigh R.; Keene, William C.; Pszenny, Alex A. P.; Hodzic, Alma; Global impact of nitrate photolysis in sea-salt aerosol on {NO}{\&}lt$\mathsemicolon$sub{\&}gt$\mathsemicolon$x{\&}lt$\mathsemicolon$/sub{\&}gt$\mathsemicolon$, {OH}, and O{\&}lt$\mathsemicolon$sub{\&}gt$\mathsemicolon$3{\&}lt$\mathsemicolon$/sub{\&}gt$\mathsemicolon$ in the marine boundary layer. Atmospheric Chemistry And Physics Discussions 1--31, [doi:10.5194/acp-2018-303] May 2018
- Wang, Xuan; Jacob, Daniel J.; Eastham, Sebastian D.; Sulprizio, Melissa P.; Zhu, Lei; Chen, Qianjie; Alexander, Becky; Sherwen, Tomás; Evans, Mathew J.; Lee, Ben H.; Haskins, Jessica D.; Lopez-Hilfiker, Felipe D.; Thornton, Joel A.; Huey, Gregory L.; Liao, Hong; The role of chlorine in tropospheric chemistry. Atmospheric Chemistry And Physics Discussions 1--40, [doi:10.5194/acp-2018-1088] Oct 2018
- Chen, Qianjie; Sherwen, Tomás; Evans, Mathew J.; Alexander, Becky; {DMS} oxidation and sulfur aerosol formation in the marine troposphere: a focus on reactive halogen and multiphase chemistry. Atmospheric Chemistry And Physics Discussions 1--32, [doi:10.5194/acp-2018-410] May 2018
- Newland, Mike J.; Rickard, Andrew R.; Sherwen, Tomás; Evans, Mathew J.; Vereecken, Luc; Muñoz, Amalia; Ródenas, Milagros; Bloss, William J.; The atmospheric impacts of monoterpene ozonolysis on global stabilised Criegee intermediate budgets and SO₂ oxidation: experiment, theory and modelling. Atmospheric Chemistry And Physics, 18 (8) , 6095--6120, [doi:10.5194/acp-18-6095-2018] May 2018
- Stone, Daniel; Sherwen, Tomás; Evans, Mathew J.; Vaughan, Stewart; Ingham, Trevor; Whalley, Lisa K.; Edwards, Peter M.; Read, Katie A.; Lee, James D.; Moller, Sarah J.; Carpenter, Lucy J.; Lewis, Alastair C.; Heard, Dwayne E.; Impacts of bromine and iodine chemistry on tropospheric OH and HO₂: comparing observations with box and global model perspectives. Atmospheric Chemistry And Physics, 18 (5) , 3541--3561, [doi:10.5194/acp-18-3541-2018] Mar 2018
- Chen, Qianjie; Sherwen, Tomás; Evans, Mathew J.; Alexander, Becky; {DMS} oxidation and sulfur aerosol formation in the marine troposphere: a focus on reactive halogen and multiphase chemistry. Atmospheric Chemistry And Physics, 18 (18) , 13617--13637, [doi:10.5194/acp-18-13617-2018] Sep 2018
- Sommariva, Roberto; Hollis, Lloyd D. J.; Sherwen, Tomás; Baker, Alex R.; Ball, Stephen M.; Bandy, Brian J.; Bell, Thomas G.; Chowdhury, Mohammad N.; Cordell, Rebecca L.; Evans, Mathew J.; Lee, James D.; Reed, Chris; Reeves, Claire E.; Roberts, James M.; Yang, Mingxi; Monks, Paul S.; Seasonal and geographical variability of nitryl chloride and its precursors in Northern Europe. Atmospheric Science Letters, 19 (8) , e844, [doi:10.1002/asl.844] Aug 2018
- Kasibhatla, Prasad; Sherwen, Tomás; Evans, Mathew J.; Carpenter, Lucy J.; Reed, Chris; Alexander, Becky; Chen, Qianjie; Sulprizio, Melissa P.; Lee, James D.; Read, Katie A.; Bloss, William; Crilley, Leigh R.; Keene, William C.; Pszenny, Alexander A. P.; Hodzic, Alma; Global impact of nitrate photolysis in sea-salt aerosol on NOₓ, OH, and O₃ in the marine boundary layer. Atmospheric Chemistry And Physics, 18 (15) , 11185--11203, [doi:10.5194/acp-18-11185-2018] Aug 2018
- Reed, Chris; Evans, Mathew J.; Crilley, Leigh R.; Bloss, William J.; Sherwen, Tomás; Read, Katie A.; Lee, James D.; Carpenter, Lucy J.; Evidence for renoxification in the tropical marine boundary layer. Atmospheric Chemistry And Physics Discussions 1--29, [doi:10.5194/acp-2016-1111] Jan 2017
- Koenig, Theodore K.; Volkamer, Rainer; Baidar, Sunil; Dix, Barbara; Wang, Siyuan; Anderson, Daniel C.; Salawitch, Ross J.; Wales, Pamela A.; Cuevas, Carlos A.; Fernandez, Rafael P.; Saiz-Lopez, Alfonso; Evans, Mathew J.; Sherwen, Tomás; Jacob, Daniel J.; Schmidt, Johan; Kinnison, Douglas; Lamarque, Jean-Francois; Apel, Eric C.; Bresch, James C.; Campos, Teresa; Flocke, Frank M.; Hall, Samuel R.; Honomichl, Shawn B.; Hornbrook, Rebecca; Jensen, Jørgen B.; Lueb, Richard; Montzka, Denise D.; Pan, Laura L.; Reeves, J. Michael; Schauffler, Sue M.; Ullmann, Kirk; Weinheimer, Andrew J.; Atlas, Elliot L.; Donets, Valeria; Navarro, Maria A.; Riemer, Daniel; Blake, Nicola J.; Chen, Dexian; Huey, L. Gregory; Tanner, David J.; Hanisco, Thomas F.; Wolfe, Glenn M.; BrO and inferred BrY profiles over the western Pacific: relevance of inorganic bromine sources and a BrY minimum in the aged tropical tropopause layer. Atmospheric Chemistry And Physics Discussions 1--46, [doi:10.5194/acp-2017-572] Jul 2017
- Stone, Daniel; Sherwen, Tomás; Evans, Mathew J.; Vaughan, Stewart; Ingham, Trevor; Whalley, Lisa K.; Edwards, Peter M.; Read, Katie A.; Lee, James D.; Moller, Sarah J.; Carpenter, Lucy J.; Lewis, Alastair C.; Heard, Dwayne E.; Impacts of bromine and iodine chemistry on tropospheric {OH} and {HO₂}: Comparing observations with box and global model perspectives. Atmospheric Chemistry And Physics Discussions 1--39, [doi:10.5194/acp-2017-892] Oct 2017
- Archibald, Alexander; Arnold, Stephen; Bejan, Lustinian; Brown, Steven; Bruggemann, Martin; Carpenter, Lucy J; Collins, William; Evans, Mathew; Finlayson-Pitts, Barbara; George, Christian; Hastings, Meredith; Heard, Dwayne; Hewitt, C N; Isaacman-VanWertz, Gabriel; Kalberer, Markus; Keutsch, Frank; Kiendler-Scharr, Astrid; Knopf, Daniel; Lelieveld, Jos; Marais, Eloise; Petzold, Andreas; Ravishankara, A; Reid, Jonathan; Rovelli, Grazia; Scott, Catherine; Sherwen, Tomás; Shindell, Drew; Tinel, Liselotte; Unger, Nadine; Wahner, Andreas; Wallington, Timothy J; Williams, Jonathan; Young, Paul; Zelenyuk, Alla; {Atmospheric chemistry and the biosphere: general discussion}. Faraday Discuss. --, [doi:10.1039/c7fd90038d] 2017
- Koenig, T. K.; Volkamer, R.; Baidar, S.; Dix, B.; Wang, S; Anderson, D. C.; Salawitch, RJ; Wales, P A; Cuevas, C A; Fernandez, R P; Saiz-Lopez, A; Evans, M. J.; Sherwen, T; Jacob, DJ; Schmidt, J; Kinnison, DE; Lamarque, J. -F.; APEL, EC; Bresch, J C; CAMPOS, T; Flocke, F M; Hall, S R; Honomichl, S B; Hornbrook, R; Jensen, J B; Lueb, R; Montzka, D. D.; Pan, LL; Reeves, J M; Schauffler, Sue; Ullmann, K.; Weinheimer, A. J.; Atlas, EL; Donets, V.; Navarro, M. A.; RIEMER, DD; Blake, N.; Chen, D; HUEY, LG; Tanner, D.; Hanisco, T. F.; Wolfe, G. M.; {BrO and inferred Br{\_}y profiles over the western Pacific: relevance of inorganic bromine sources and a Br{\_}y minimum in the aged tropical tropopause layer}. Atmospheric Chemistry And Physics, 17 (24) , 15245--15270, [doi:10.5194/acp-17-15245-2017] 2017
- Newland, Mike J.; Rickard, Andrew R.; Sherwen, Tomás; Evans, Mathew J.; Vereecken, Luc; Muñoz, Amalia; Ródenas, Milagros; Bloss, William J.; The atmospheric impacts of monoterpene ozonolysis on global stabilised Criegee intermediate budgets and SO₂ oxidation: experiment, theory and modelling. Atmospheric Chemistry And Physics Discussions 1--65, [doi:10.5194/acp-2017-1095] Dec 2017
- Reed, Chris; Evans, Mathew J.; Crilley, Leigh R.; Bloss, William J.; Sherwen, T; Read, Katie A.; Lee, James D.; Carpenter, Lucy J.; Evidence for renoxification in the tropical marine boundary layer. Atmospheric Chemistry And Physics, 17 (6) , 4081–4092, [doi:10.5194/acp-17-4081-2017] Mar 2017
- Sherwen, T; Evans, Mathew John J; Sommariva, Roberto; Hollis, Lloyd D. J.; Ball, Stephen; Monks, Paul; Reed, Chris; Carpenter, Lucy; Lee, James D.; Forster, Grant; Bandy, Brian; Reeves, Claire; Bloss, William; {Effects of halogens on European air-quality}. Faraday Discuss. [doi:10.1039/c7fd00026j] 2017
- Sherwen, T; Evans, Mat J.; Carpenter, Lucy J.; Schmidt, Johan A.; Mickley, Loretta J.; {Halogen chemistry reduces tropospheric O3 radiative forcing}. Atmospheric Chemistry And Physics, 17 (2) , 1557--1569, [doi:10.5194/acp-17-1557-2017] Jan 2017
- Sherwen, Tomás; Schmidt, J. A.; Evans, M. J.; Carpenter, L. J.; Grossman, N.; Eastham, S. D.; Jacob, D. J.; Dix, B.; Koenig, T. K.; Sinreich, R.; Ortega, P.; Volkamer, R.; Saiz-Lopez, A.; Prados-Roman, C.; Mahajan, A. S.; Ordóñez, C.; {Global impacts of tropospheric halogens (Cl, Br, I) on oxidants and composition in GEOS-Chem}. Atmospheric Chemistry And Physics 1--52, [doi:10.5194/acp-16-12239-2016] 2016
- Sherwen, T; Evans, Mat J.; Spracklen, Dominick V.; Carpenter, Lucy J.; Chance, Rosie; Baker, Alex R.; Schmidt, Johan A.; Breider, Thomas J; Global modelling of tropospheric iodine aerosol. Geophysical Research Letters, 43 (10) , 10012–10019, [doi:10.1002/2016gl070062] 2016
- Sherwen, Tomás; Evans, M. J.; Carpenter, L. J.; Schmidt, J. A.; Mickely, L. J.; Halogen chemistry reduces tropospheric O₃ radiative forcing. Atmospheric Chemistry And Physics Discussions 1--18, [doi:10.5194/acp-2016-688] 2016
- Sherwen, Tomás; Evans, M. J.; Carpenter, L. J.; Andrews, S. J.; Lidster, R. T.; Dix, B.; Koenig, T. K.; Sinreich, R.; Ortega, I.; Volkamer, R.; Saiz-Lopez, A.; Prados-Roman, C.; Mahajan, A. S.; Ordóñez, C.; {Iodine's impact on tropospheric oxidants: a global model study in GEOS-Chem}. Atmospheric Chemistry And Physics, 16 (2) , 1161--1186, [doi:10.5194/acp-16-1161-2016] Feb 2016
- Dunmore, Rachel E.; Whalley, Lisa K.; Sherwen, T; Evans, Mathew J.; Heard, Dwayne E.; Hopkins, James R.; Lee, James D.; Lewis, Alastair C.; Lidster, Richard T.; Rickard, Andrew R.; Hamilton, Jacqueline F.; Atmospheric ethanol in London and the potential impacts of future fuel formulations. Faraday Discuss., 189, 105–120, [doi:10.1039/c5fd00190k] 2016
- Schmidt, J. A.; Jacob, D. J.; Horowitz, H. M.; Hu, L.; Sherwen, Tomás; Evans, M. J.; Liang, Q.; Suleiman, R. M.; Oram, David E.; Le Breton, M.; Percival, C. J.; Wang, S.; Dix, B.; Volkamer, R.; Modeling the observed tropospheric BrO background: Importance of multiphase chemistry and implications for ozone, OH, and mercury. Journal Of Geophysical Research, 121 (19) , 11,819–11,835, [doi:10.1002/2015jd024229] Oct 2016
- Acquaye, Adolf A.; Sherwen, Tomás; Genovese, Andrea; Kuylenstierna, Johan; Koh, SC Lenny; McQueen-Mason, Simon; Biofuels and their potential to aid the \{UK\} towards achieving emissions reduction policy targets. Renewable And Sustainable Energy Reviews, 16 (7) , 5414 - 5422, [doi:10.1016/j.rser.2012.04.046] 2012