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The motivation for my research is to understand the chemical and dynamical factors that determine changes in atmospheric composition. These are fascinating as scientific problems in their own right and are also important for global environmental issues such as stratospheric ozone depletion and climate change. In the past, scientists have concentrated on relatively short term chemical processes (seconds to weeks); it is now important than ever to understand how atmospheric composition is influenced by longer-term processes (weeks to years). A wealth of measurements exists that has been collected in global monitoring networks, during focussed field campaigns and by satellite instruments. Great opportunities exist to exploit these data to understand a range of atmospheric problems. My approach is to analyse and interpret the available measurements, collaborating closely with the atmospheric modelling (Prof. Pyle) and measurement (Prof. Jones and Dr Kalberer) groups in the Chemistry Department. Given the global nature of the problems considered, international collaborations are important components of the work. Topics are being studied include: Stratospheric ozone depletion over northern hemisphere. Quantifying past ozone loss and particularly the relative importance of chemical depletion and dynamical influences is essential to understanding how stratospheric ozone will change in future; Emissions of trace gases in South East Asia. Gases emitted from the Tropical oceans (halocacarbons) and forests (isoprene and terpenes) have important impacts on the global atmosphere. We are making measurements of their concentrations and using models to investigate their emissions and impact. Transport of chemical species in the Tropics. The bulk of air entering the stratosphere does so in the Tropics. Measurements from aircraft campaigns in the pacific are analysed to quantify the vertical transport in the extremely strong storms in the Pacific. Emissions of greenhouse gases in the United Kingdom. We are developing analytical techniques using our own measurements to quantify these emissions at local scales, with the aim of improving avaiable monitoring networks and to pinpoint where emissions are occurring. In addition to using off the shelf instruments, I have a small group developing and constructing instruments capable of running autonomously in order to make observations for months and years at a time. These custom-built instruments are used to make measurements of short-lived halocarbons and hydrocarbons at sites in Malaysia and other locations in the West Pacific (Taiwan, Australia and New Zealand), where there are few measurements. The observations are valuable in their own right, and are being used to estimate emissions of these compounds, which are important for ozone in the stratosphere and troposphere and possibly for particle formation over the remote oceans.


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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) 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) 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) Past changes in the vertical distribution of ozone – Part 1: Measurement techniques, uncertainties and availability B Hassler, I Petropavlovskikh, J Staehelin, T August, PK Bhartia, C Clerbaux, D Degenstein, M De Maziere, BM Dinelli, A Dudhia, G Dufour, SM Frith, L Froidevaux, S Godin-Beekmann, J Granville, NRP Harris, K Hoppel, D Hubert, Y Kasai, MJ Kurylo, E Kyroelae, J-C Lambert, PF Levelt, CT McElroy, RD McPeters, R Munro, H Nakajima, A Parrish, P Raspollini, EE Remsberg, KH Rosenlof, A Rozanov, T Sano, Y Sasano, M Shiotani, HGJ Smit, G Stiller, J Tamminen, DW Tarasick, J Urban, RJ van der A, JP Veefkind, C Vigouroux, T von Clarmann, C von Savigny, KA Walker, M Weber, J Wild, JM Zawodny – Atmospheric Measurement Techniques (2014) 7, 1395 (DOI: 10.5194/amt-7-1395-2014) Joe Farman (1930–2013) J Pyle, N Harris – Nature (2013) 498, 435 (DOI: 10.1038/498435a) Global sea-to-air flux climatology for bromoform, dibromomethane and methyl iodide F Ziska, B Quack, K Abrahamsson, SD Archer, E Atlas, T Bell, JH Butler, LJ Carpenter, CE Jones, NRP Harris, H Hepach, KG Heumann, C Hughes, J Kuss, K Krüger, P Liss, RM Moore, A Orlikowska, S Raimund, CE Reeves, W Reifenhäuser, AD Robinson, C Schall, T Tanhua, S Tegtmeier, S Turner, L Wang, D Wallace, J Williams, H Yamamoto, S Yvon-Lewis, Y Yokouchi – Atmospheric Chemistry and Physics (2013) 13, 8915 (DOI: 10.5194/acp-13-8915-2013) Volatile halocarbon emissions by three tropical brown seaweeds under different irradiances FS-L Keng, S-M Phang, NA Rahman, EC Leedham, C Hughes, AD Robinson, NRP Harris, JA Pyle, WT Sturges – Journal of Applied Phycology (2013) 25, 1377 (DOI: 10.1007/s10811-013-9990-x) Potential climatic transitions with profound impact on Europe A Levermann, JL Bamber, S Drijfhout, A Ganopolski, W Haeberli, NRP Harris, M Huss, K Krüger, TM Lenton, RW Lindsay, D Notz, P Wadhams, S Weber – Climatic Change: an interdisciplinary, international journal devoted to the description, causes and implications of climatic change (2012) 110, 845 (DOI: 10.1007/s10584-011-0126-5) Transport of short-lived species into the Tropical Tropopause Layer MJ Ashfold, NRP Harris, EL Atlas, AJ Manning, JA Pyle – Atmospheric Chemistry and Physics (2012) 12, 6309 (DOI: 10.5194/acp-12-6309-2012) An overview of the HIBISCUS campaign JP Pommereau, A Garnier, G Held, AM Gomes, F Goutail, G Durry, F Borchi, A Hauchecorne, N Montoux, P Cocquerez, G Letrenne, F Vial, A Hertzog, B Legras, I Pisso, JA Pyle, NRP Harris, RL Jones, AD Robinson, G Hansford, L Eden, T Gardiner, N Swann, B Knudsen, N Larsen, JK Nielsen, T Christensen, F Cairo, F Fierli, M Pirre, V Marecal, N Huret, ED Riviere, H Coe, D Grosvenor, K Edvarsen, G Di Donfrancesco, P Ricaud, JJ Berthelier, M Godefroy, E Seran, K Longo, S Freitas – Atmospheric Chemistry and Physics (2011) 11, 2309 (DOI: 10.5194/acp-11-2309-2011) Bromoform in the tropical boundary layer of the Maritime Continent during OP3 JA Pyle, MJ Ashfold, NRP Harris, AD Robinson, NJ Warwick, GD Carver, B Gostlow, LM O'Brien, AJ Manning, SM Phang, SE Yong, KP Leong, EH Ung, S Ong – Atmospheric Chemistry and Physics (2011) 11, 529 (DOI: 10.5194/acp-11-529-2011) Results from the first national UK inter-laboratory calibration for very short-lived halocarbons CE Jones, SJ Andrews, LJ Carpenter, C Hogan, FE Hopkins, JC Laube, AD Robinson, TG Spain, SD Archer, NRP Harris, PD Nightingale, SJ O'Doherty, DE Oram, JA Pyle, JH Butler, BD Hall – Atmospheric Measurement Techniques (2011) 4, 865 (DOI: 10.5194/amt-4-865-2011) The EU project SHIVA (Stratospheric ozone: Halogen Impacts in a Varying Atmosphere) K Pfeilsticker, M Dorf, D Oram, B Quack, BM Sinnhuber, S Fueglisthaler, NRP Harris – SPARC Newsletter (2011) 23 The impact of local surface changes in Borneo on atmospheric composition at wider spatial scales: coastal processes, land-use change and air quality JA Pyle, NJ Warwick, NR Harris, MR Abas, AT Archibald, MJ Ashfold, K Ashworth, MP Barkley, GD Carver, K Chance, JR Dorsey, D Fowler, S Gonzi, B Gostlow, CN Hewitt, TP Kurosu, JD Lee, SB Langford, G Mills, S Moller, AR MacKenzie, AJ Manning, P Misztal, MS Nadzir, E Nemitz, HM Newton, LM O'Brien, S Ong, D Oram, PI Palmer, LK Peng, SM Phang, R Pike, TA Pugh, NA Rahman, AD Robinson, J Sentian, AA Samah, U Skiba, HE Ung, SE Yong, PJ Young – Philosophical Transactions of the Royal Society B: Biological Sciences (2011) 366, 3210 (DOI: 10.1098/rstb.2011.0060) μDirac: an autonomous instrument for halocarbon measurements B Gostlow, AD Robinson, NRP Harris, LM O'Brien, DE Oram, GP Mills, HM Newton, SE Yong, JA Pyle – Atmospheric Measurement Techniques (2010) 3, 507 (DOI: 10.5194/amt-3-507-2010) A closer look at Arctic ozone loss and polar stratospheric clouds NRP Harris, R Lehmann, M Rex, P von der Gathen – Atmospheric Chemistry and Physics (2010) 10, 8499 (DOI: 10.5194/acp-10-8499-2010) An introduction to the SCOUT-AMMA stratospheric aircraft, balloons and sondes campaign in West Africa, August 2006: Rationale and roadmap F Cairo, JP Pommereau, KS Law, H Schlager, A Garnier, F Fierli, M Ern, M Streibel, S Arabas, S Borrmann, JJ Berthelier, C Blom, T Christensen, F D'Amato, G Di Donfrancesco, T Deshler, A Diedhiou, G Durry, O Engelsen, F Goutail, NRP Harris, ERT Kerstel, S Khaykin, P Konopka, A Kylling, N Larsen, T Lebel, X Liu, AR MacKenzie, J Nielsen, A Oulanowski, DJ Parker, J Pelon, J Polcher, JA Pyle, F Ravegnani, ED Riviere, AD Robinson, T Rockmann, C Schiller, F Simoes, L Stefanutti, F Stroh, L Some, P Siegmund, N Sitnikov, JP Vernier, CM Volk, C Voigt, M von Hobe, S Viciani, V Yushkov – Atmospheric Chemistry and Physics (2010) 10, 2237 Representation of tropical deep convection in atmospheric models - Part 2: Tracer transport CR Hoyle, V Marecal, MR Russo, G Allen, J Arteta, C Chemel, MP Chipperfield, F D'Amato, O Dessens, W Feng, JF Hamilton, NRP Harris, JS Hosking, AC Lewis, O Morgenstern, T Peter, JA Pyle, T Reddmann, NAD Richards, PJ Telford, W Tian, S Viciani, A Volz-Thomas, O Wild, X Yang, G Zeng – Atmospheric Chemistry and Physics (2010) 11, 8103 (DOI: 10.5194/acp-11-8103-2011) Bromocarbons in the tropical marine boundary layer at the Cape Verde Observatory - Measurements and modelling LM O'Brien, NRP Harris, AD Robinson, B Gostlow, N Warwick, X Yang, JA Pyle – Atmospheric Chemistry and Physics (2009) 9, 9083 (DOI: 10.5194/acp-9-9083-2009) THE FUTURE FOR RESEARCH BALLOONS IN EUROPE N Harris, H Oelhaf – PROCEEDINGS OF THE 19TH ESA SYMPOSIUM ON EUROPEAN ROCKET AND BALLOON PROGRAMMES AND RELATED RESEARCH (2009) 671, 443