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Department of Chemistry


I wear glasses nowI am an NCAS research scientist and University SRA working with Professor John Pyle and Dr Alex Archibald. My background is in experimental physical chemistry and aerosol-cloud interactions, but for the last ten years I have been working on numerical simulation of the atmosphere, focussing on the chemistry of the troposphere. My main interests are in halogens, methane, NOx and heterogeneous chemistry. I am also interested in model-measurement comparisons and ways to quantify and improve model treatments of atmospheric composition.  To the unalloyed delight of the Chemistry Dept IT officers, I am an ARCHER 'champion' which means I should act as a local point of contact if people are interested in the ARCHER HPC platform.  Recently I became a Cambridge University 'Data Champion.' 

Research Projects

  • I am leading some work on the treatment of methane in chemistry-climate models, following on Ines Heimann's PhD (some of which has been accepted for publication). I recently organised a meeting in Cambridge on February 10th-11th, 2020, looking at methane in Earth System models, and have run som AerChemMIP experiments using UKESM1 to look at the effect of methane in the chemistry-climate system.
  • I take an interest in the implementation of heterogeneous chemistry in the development versions of UM-UKCA.  Currently I'm looking at feedbacks between oxidant and aerosol as part of the ACSIS analysis of tropospheric oxidants.
  • My work in halogens began with the NERC BLOWSEA project, which examines the impact of blowing snow on tropospheric ozone. This involves collaboration with researchers at the British Antartic Survey, running simulations which quantify the release of bromine from sea-ice, and I'm also running box model simulations of HOx/halogen chemistry interactions.  I recently contributed some box modelling to a related study.  I led our contribution to the TRANSCOM-VSLS intercomparison project, headed by Ryan Hossaini at Lancaster, which looked at the transport and lifetime of very short lived halogen species.  
  • Tropospheric ozone remains a focus.  I am finishing the modelling work in the “Oxidant Budgets of the Northern Hemisphere Troposphere Since 1950” (OXBUDS) project together with Alex Archibald and colleagues at UEA.  We're looking the impact of nitrate emissions and chemistry in UKCA.  I contributed to the forthcoming TOAR BUDGET paper, led an analysis of some work that used our CCMI REFC1SD integrations and was a lead author of a paper that examined tropospheric ozone in CMIP6 models.


Currently, I am a fellow in chemistry and graduate tutor at Robinson College, for whom I supervise at Part II and Part III level.  Previously, I was lecturer in the Part II course 'Chemistry of the Atmosphere' (2006-2009, and again 2016-2018), and have also lectured the A6 course 'Concepts in Physical Chemistry' (2012-2015).  I have also supervised Parts IA and IB Chemistry, the part II course 'High Resolution Spectroscopy' and the Part III interdisciplinary course 'Atmospheric Chemistry and Global Change' as well as sections of the Part IA and Part IB Geography tripos.  I've served as a University Examiner at Part 1B and have done some viva-style exams for the Chemistry Dept.



Methane Emissions in a Chemistry‐Climate Model: feedbacks and climate response
I Heimann, PT Griffiths, NJ Warwick, NL Abraham, AT Archibald, JA Pyle
– Journal of Advances in Modeling Earth Systems
The evaluation of the North Atlantic climate system in UKESM1 historical simulations for CMIP6
J Robson, Y Aksenov, TJ Bracegirdle, O Dimdore‐Miles, PT Griffiths, DP Grosvenor, DLR Hodson, J Keeble, C MacIntosh, A Megann, S Osprey, AC Povey, D Schröder, M Yang, AT Archibald, KS Carslaw, L Gray, C Jones, B Kerridge, D Knappett, T Kuhlbrodt, M Russo, A Sellar, R Siddans, B Sinha, R Sutton, J Walton, LJ Wilcox
– Journal of Advances in Modeling Earth Systems
Ozone Trends from Two Decades of Ground Level Observation in Malaysia
F Ahamad, PT Griffiths, MT Latif, L Juneng, CJ Xiang
– Atmosphere
Modelling the potential impacts of the recent, unexpected increase in CFC-11 emissions on total column ozone recovery
J Keeble, N Luke Abraham, AT Archibald, MP Chipperfield, S Dhomse, PT Griffiths, JA Pyle
– Atmospheric Chemistry and Physics
Stratospheric ozone changes from explosive tropical volcanoes: Modelling and ice core constraints
A Ming, VHL Winton, J Keeble, NL Abraham, MC Dalvi, P Griffiths, N Caillon, AE Jones, R Mulvaney, J Savarino, MM Frey, X Yang
– Journal of Geophysical Research: Atmospheres
ARTN e2019JD032290
On the Changing Role of the Stratosphere on the Tropospheric Ozone Budget: 1979–2010
PT Griffiths, J Keeble, YM Shin, NL Abraham, AT Archibald, JA Pyle
– Geophysical Research Letters
Implementation of UK Earth System Models for CMIP6
AA Sellar, J Walton, CG Jones, R Wood, NL Abraham, M Andrejczuk, MB Andrews, T Andrews, AT Archibald, L de Mora, H Dyson, M Elkington, R Ellis, P Florek, P Good, L Gohar, S Haddad, SC Hardiman, E Hogan, A Iwi, CD Jones, B Johnson, DI Kelley, J Kettleborough, JR Knight, MO Köhler, T Kuhlbrodt, S Liddicoat, I Linova-Pavlova, MS Mizielinski, O Morgenstern, J Mulcahy, E Neininger, FM O'Connor, R Petrie, J Ridley, JC Rioual, M Roberts, E Robertson, S Rumbold, J Seddon, H Shepherd, S Shim, A Stephens, JC Teixiera, Y Tang, J Williams, A Wiltshire, PT Griffiths
– Journal of Advances in Modeling Earth Systems
ARTN e2019MS001946
Description and evaluation of the UKCA stratosphere–troposphere chemistry scheme (StratTrop vn 1.0) implemented in UKESM1
A T Archibald, F M O'Connor, N Luke Abraham, S Archer-Nicholls, M P Chipperfield, M Dalvi, G A Folberth, F Dennison, S S Dhomse, P T Griffiths, C Hardacre, A J Hewitt, R S Hill, C E Johnson, J Keeble, M O Köhler, O Morgenstern, J P Mulcahy, C Ordóñez, R J Pope, S T Rumbold, M R Russo, N H Savage, A Sellar, M Stringer, S T Turnock, O Wild, G Zeng
– Geoscientific Model Development
Methane Mitigation: Methods to Reduce Emissions, on the Path to the Paris Agreement
EG Nisbet, RE Fisher, D Lowry, JL France, G Allen, S Bakkaloglu, TJ Broderick, M Cain, M Coleman, J Fernandez, G Forster, PT Griffiths, CP Iverach, BFJ Kelly, MR Manning, PBR Nisbet-Jones, JA Pyle, A Townsend-Small, A al-Shalaan, N Warwick, G Zazzeri
– Reviews of Geophysics
ARTN e2019RG000675
Assessment of pre-industrial to present-day anthropogenic climate forcing in UKESM1
FM O'Connor, NL Abraham, M Dalvi, G Folberth, P Griffiths, C Hardacre, BT Johnson, R Kahana, J Keeble, B Kim, O Morgenstern, JP Mulcahy, MG Richardson, E Robertson, J Seo, S Shim, JC Teixeira, S Turnock, J Williams, A Wiltshire, G Zeng
– Atmospheric Chemistry and Physics
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01223 748889

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