研究领域

Physical/Theoretical

My research involves the use of state-of-the-art numerical models, run on supercomputers, to study the processes controlling the present state of the atmosphere and its evolution. A NERC Unit, the Atmospheric Chemistry Modelling Support Unit, is incorporated into the group. Current research activities include: Stratospheric Modelling The chemistry, dynamics and radiative transfer of the stratosphere are being studied using a number of numerical models. Three particular problems being tackled are (i) the rapid depletion of ozone found recently in the polar spring, the so-called 'ozone hole', (ii) the more gradual decline in northern hemisphere ozone levels (which we have recently ascribed partly to long-term changes in atmospheric flow, and (iii) the effect on stratospheric ozone of increasing concentrations of CO2, CH4, N2O and the chlorofluorocarbons. Tropospheric Modelling We have developed a range of models for studying the chemistry of the lower atmosphere, from complex 3D models to models based on air parcel trajectories. A major research theme is the changing oxidizing capacity of the troposphere (the ability of the troposphere to cleanse itself of pollution). An important part of our work includes involvement in field campaigns. Chemistry/climate interactions These interactions have become a major research topic in recent years. We have included a detailed chemistry package into the Met Office's climate model, to study composition change since the industrial revolution and into the future. We have calculated the change in surface ozone at the end of this century, under certain assumptions about changing industrial emissions. The change is very climate-dependent, but shows massive increases (which are expected to lead to major health problems) over some of the continents. Atmospheric composition measurements We have developed lightweight gas chromatography instruments to measure halocarbons. These have been deployed from balloons and high-flying research aircraft. Many of the problems addressed are of an interdisciplinary nature. Members of the group, which numbers about 20 postdoctoral researchers and students, come from a wide range of backgrounds in mathematics and physical science. Within Cambridge we collaborate closely with scientists at the Department of Applied Mathematics and Theoretical Physics.

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A large ozone-circulation feedback and its implications for global warming assessments PJ Nowack, NL Abraham, AC Maycock, P Braesicke, JM Gregory, MM Joshi, A Osprey, JA Pyle – Nat Clim Chang (2014) 5, 41 (DOI: 10.1038/NCLIMATE2451) The impact of polar stratospheric ozone loss on southern Hemisphere stratospheric circulation and climate J Keeble, P Braesicke, NL Abraham, HK Roscoe, JA Pyle – Atmospheric Chemistry and Physics (2014) 14, 13705 (DOI: 10.5194/acp-14-13705-2014) Methane and carbon dioxide fluxes and their regional scalability for the European Arctic wetlands during the MAMM project in summer 2012 SJ O'Shea, G Allen, MW Gallagher, K Bower, SM Illingworth, JBA Muller, BT Jones, CJ Percival, SJ-B Bauguitte, M Cain, N Warwick, A Quiquet, U Skiba, J Drewer, K Dinsmore, EG Nisbet, D Lowry, RE Fisher, JL France, M Aurela, A Lohila, G Hayman, C George, DB Clark, AJ Manning, AD Friend, J Pyle – Atmospheric Chemistry and Physics (2014) 14, 13159 (DOI: 10.5194/acp-14-13159-2014) Aerosol microphysics simulations of the Mt.~Pinatubo eruption with the UM-UKCA composition-climate model SS Dhomse, KM Emmerson, GW Mann, N Bellouin, KS Carslaw, MP Chipperfield, R Hommel, NL Abraham, P Telford, P Braesicke, M Dalvi, CE Johnson, F O'Connor, O Morgenstern, JA Pyle, T Deshler, JM Zawodny, LW Thomason – Atmospheric Chemistry and Physics (2014) 14, 11221 (DOI: 10.5194/acp-14-11221-2014) Airborne measurements of HC(O)OH in the European Arctic: A winter - summer comparison BT Jones, JBA Muller, SJ O'Shea, A Bacak, M Le Breton, TJ Bannan, KE Leather, AM Booth, S Illingworth, K Bower, MW Gallagher, G Allen, DE Shallcross, SJ-B Bauguitte, JA Pyle, CJ Percival – Atmospheric Environment (2014) 99, 556 (DOI: 10.1016/j.atmosenv.2014.10.030) How sensitive is the recovery of stratospheric ozone to changes in concentrations of very short-lived bromocarbons? X Yang, NL Abraham, AT Archibald, P Braesicke, J Keeble, PJ Telford, NJ Warwick, JA Pyle – Atmospheric Chemistry and Physics (2014) 14, 10431 (DOI: 10.5194/acp-14-10431-2014) Aviation and climate change O Dessens, MO Köhler, HL Rogers, RL Jones, JA Pyle – Transport Policy (2014) 34, 14 (DOI: 10.1016/j.tranpol.2014.02.014) Aviation and climate change O Dessens, MO Köhler, HL Rogers, RL Jones, JA Pyle – Transport Policy (2014) 34, 14 (DOI: 10.1016/j.tranpol.2014.02.014) Bromocarbons in the tropical coastal and open ocean atmosphere during the 2009 Prime Expedition Scientific Cruise (PESC-09) MSM Nadzir, SM Phang, MR Abas, NA Rahman, A Abu Samah, WT Sturges, DE Oram, GP Mills, EC Leedham, JA Pyle, NRP Harris, AD Robinson, MJ Ashfold, MI Mead, MT Latif, MF Khan, AM Amiruddin, N Banan, MM Hanafiah – Atmospheric Chemistry and Physics (2014) 14, 8137 (DOI: 10.5194/acp-14-8137-2014) Effects of decarbonising international shipping and aviation on climate mitigation and air pollution O Dessens, A Anger, T Barker, J Pyle – Environmental Science and Policy (2014) 44, 1 (DOI: 10.1016/j.envsci.2014.07.007) Erratum: Heterogeneous reaction of N2O5 with airborne TiO2 particles and its implication for stratospheric particle injection( Atmospheric Chemistry and Physics (2014) 14 (6035-6048)) MJ Tang, PJ Telford, FD Pope, L Rkiouak, NL Abraham, AT Archibald, P Braesicke, JA Pyle, J McGregor, IM Watson, RA Cox, M Kalberer – Atmospheric Chemistry and Physics (2014) 14, 8233 (DOI: 10.5194/acp-14-8233-2014) Estimates of tropical bromoform emissions using an inversion method MJ Ashfold, NRP Harris, AJ Manning, AD Robinson, NJ Warwick, JA Pyle – Atmospheric Chemistry and Physics (2014) 14, 979 (DOI: 10.5194/acp-14-979-2014) Evaluation of the new UKCA climate-composition model-Part 2: The troposphere FM O'Connor, CE Johnson, O Morgenstern, NL Abraham, P Braesicke, M Dalvi, GA Folberth, MG Sanderson, PJ Telford, A Voulgarakis, PJ Young, G Zeng, WJ Collins, JA Pyle – Geoscientific Model Development (2014) 7, 41 (DOI: 10.5194/gmd-7-41-2014) Heterogeneous reaction of N2O5 with airborne TiO2 particles and its implication for stratospheric particle injection (vol 14, pg 6035, 2014) MJ Tang, PJ Telford, FD Pope, L Rkiouak, NL Abraham, AT Archibald, P Braesicke, JA Pyle, J McGregor, IM Watson, RA Cox, M Kalberer – ATMOSPHERIC CHEMISTRY AND PHYSICS (2014) 14, 8233 (DOI: 10.5194/acp-14-8233-2014) Heterogeneous reaction of N2O5 with airborne TiO2 particles and its implication for stratospheric particle injection MJ Tang, PJ Telford, FD Pope, L Rkiouak, NL Abraham, AT Archibald, P Braesicke, JA Pyle, J McGregor, IM Watson, RA Cox, M Kalberer – Atmospheric Chemistry and Physics (2014) 14, 6035 (DOI: 10.5194/acp-14-6035-2014) Influence of future climate and cropland expansion on isoprene emissions and tropospheric ozone OJ Squire, AT Archibald, NL Abraham, DJ Beerling, CN Hewitt, J Lathière, RC Pike, PJ Telford, JA Pyle – Atmospheric Chemistry and Physics (2014) 14, 1011 (DOI: 10.5194/acp-14-1011-2014) Lightning NOx, a key chemistry–climate interaction: impacts of future climate change and consequences for tropospheric oxidising capacity A Banerjee, AT Archibald, AC Maycock, P Telford, NL Abraham, X Yang, P Braesicke, JA Pyle – Atmospheric Chemistry and Physics (2014) 14, 9871 (DOI: 10.5194/acp-14-9871-2014) Long-term halocarbon observations from a coastal and an inland site in Sabah, Malaysian Borneo AD Robinson, NRP Harris, MJ Ashfold, B Gostlow, NJ Warwick, LM O'Brien, EJ Beardmore, MSM Nadzir, SM Phang, AA Samah, S Ong, HE Ung, LK Peng, SE Yong, M Mohamad, JA Pyle – Atmospheric Chemistry and Physics (2014) 14, 8369 (DOI: 10.5194/acp-14-8369-2014) Multimodel estimates of atmospheric lifetimes of long-lived ozone-depleting substances: Present and future MP Chipperfield, Q Liang, SE Strahan, O Morgenstern, SS Dhomse, NL Abraham, AT Archibald, S Bekki, P Braesicke, G Di Genova, EL Fleming, SC Hardiman, D Iachetti, CH Jackman, DE Kinnison, M Marchand, G Pitari, JA Pyle, E Rozanov, A Stenke, F Tummon – Journal of Geophysical Research: Atmospheres (2014) 119, 2555 (DOI: 10.1002/2013JD021097) Representing ozone extremes in European megacities: the importance of resolution in a global chemistry climate model ZS Stock, MR Russo, JA Pyle – Atmospheric Chemistry and Physics (2014) 14, 3899 (DOI: 10.5194/acp-14-3899-2014)