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Centre for Atmospheric Science

Senior Research Associate

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 tropospheric ozone, 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.  I am involved in various data- and HPC-related activities: I am a Cambridge University 'Data Champion', am involved with the Center for Open Science as an 'Ambassador' and am a member of the ARCHER 'HPC Champions' group. 

Research Projects

  • I take a lead in our group 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 some of the UK AerChemMIP consortium experiments using UKESM1 to look at the effect of methane in the chemistry-climate system.  These were used in David Stevenson's recent CMIP6 evaluation paper for OH trends.
  • 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 in collaboration with folks in Reading.
  • My work in halogens began with the NERC BLOWSEA project, which examined the impact of blowing snow on tropospheric ozone. This involved collaboration with researchers at the British Antartic Survey, running simulations to quantify the release of bromine from sea-ice.  This led to some box modelling of HOx/halogen chemistry interactions in a recent 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 Maria Zamyatina.  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 IA and Part II 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.



Response to Reviewer 2
P Griffiths
Response to Reviewer 1
P Griffiths
Trends in global tropospheric hydroxyl radical and methane lifetime since 1850 from AerChemMIP
DS Stevenson, A Zhao, V Naik, FM O'Connor, S Tilmes, G Zeng, LT Murray, WJ Collins, PT Griffiths, S Shim, LW Horowitz, LT Sentman, L Emmons
– Atmospheric Chemistry and Physics
The impacts of aerosol emissions on historical climate in ukesm1
J Seo, S Shim, SH Kwon, KO Boo, YH Kim, F O’connor, B Johnson, M Dalvi, G Folberth, J Teixeira, J Mulcahy, C Hardacre, S Turnock, S Woodward, L Abraham, J Keeble, P Griffiths, A Archibald, M Richardson, C Dearden, K Carslaw, J Williams, G Zeng, O Morgenstern
– Atmosphere
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
Reconciling the climate and ozone response to the 1257 CE Mount Samalas eruption
DC Wade, CM Vidal, NL Abraham, S Dhomse, PT Griffiths, J Keeble, G Mann, L Marshall, A Schmidt, AT Archibald
– Proceedings of the National Academy of Sciences of the United States of America
On the changes in surface ozone over the twenty-first century: sensitivity to changes in surface temperature and chemical mechanisms
AT Archibald, ST Turnock, PT Griffiths, T Cox, RG Derwent, C Knote, M Shin
– Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
CRI-HOM: A novel chemical mechanism for simulating highly oxygenated organic molecules (HOMs) in global chemistry-aerosol-climate models
J Weber, S Archer-Nicholls, P Griffiths, T Berndt, M Jenkin, H Gordon, C Knote, AT Archibald
– Atmospheric Chemistry and Physics
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
ARTN e2020MS002126
Ozone trends from two decades of ground level observation in Malaysia
F Ahamad, PT Griffiths, MT Latif, L Juneng, CJ Xiang
– Atmosphere
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Centre Highlights

• May 5th 2022: We've submitted to the UNFCCC's Global Stocktake (GST). More information is available on our news page. 

• March 23rd 2022: Multiple CAS academics have published a paper investigating the future role of anthropogenic methane emissions. Read the open access paper here.

• Feb 18th 2022: Dr Parris and Dr Anger-Kraavi have co-authored a paper that develops a tool to support co-designed transformative change. Read the open access paper here.

• Dec 16th 2021: Dr Parris has co-authored a paper that introduces a tool to support plastic pollution policy. Read the open access paper here.

• Nov 22nd 2021: Dr Anger-Kraavi has co-authored a paper with Paris Reinforce. Read the open access version here

• Nov 3rd 2021: Watch Dr Anger-Kraavi at the COP26 side event: Accelerating Implementation of the Paris Agreement - Ambition and Just Transitions via YouTube.

• Oct 18th 2021: Watch Dr Anger-Kraavi on Cambridge Talks: Can leaders turn Paris ambition into Glasgow action at COP26? via YouTube.

• Oct 11th 2021: Listen to the CCPG's Dr Anger-Kraavi speak about the upcoming COP26 on Tyndall Talks via Spotify.

• April 24th 2021: Listen to Dr Anger-Kraavi speak about the cost of climate reform on the BBC's The Real Story via their website

• May 14th 2020: Watch Dr Chiara Giorio speak about climate, ice cores and atmospheric particles on YouTube

Want to know more about our high-profile publications? Check out our Publication Highlights!


NCAS Research Scientist

Research Interest Group

Telephone number

01223 748889

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