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Centre for Atmospheric Science

Senior Research Associate

I am an NCAS research scientist and University SRA working with Dr Alex Archibald. I am a member of the NCAS Science Strategy Board, and co-chair of the RMS Atmospheric Chemistry Special Interest group.  My interests are 

Ozone in chemistry-climate models 

  • I was a Contributing Author the AR6 Chapter 6 on Short-Lived Climate Forcers., contributed to the 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.  
  • With James Keeble, I am co-chairing a TOAR-II group (ROSTEES) looking at stratosphere-troposphere transport of ozone.
  • With Seb Hickman, I am co-chairing a TOAR-II group (ML4O3) looking at the use of machine learning and AI to understand tropospheric ozone, and I co-supervise a project at UKM, Malaysia looking at drivers of ozone in tropical regions.
  • I am contributing to the TOAR-OPT project by performing some simulations looking at the drivers of recent historical ozone trends in the tropics.
  • We are writing up 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. 
  • Another project looks at the role of peroxy radicals from the perspective of a near-explicit common representative intermediates mechanism developed by Mike Jenkin and implemented in UKA by Scott Archer-Nicholls and James Weber.

Methane in the Earth System

Heterogeneous chemistry, for which I do some development versions of UM-UKCA, and prepared a lecture for the NCAS UKCA Training Course. 

  • Aerosol-oxidant-forcing interactions.  I did some analysis of oxidant effects on the radiative budget for a paper on the H2 economy, and presented at Cambridge Net Zero - you can find it on their YouTube channel
  • Currently in a collaboration with Vichawan Sakulsupich, we are looking at feedbacks between oxidant and aerosol as part of the ACSIS analysis of tropospheric oxidants, and now as part of RAMIP with folks in Reading.  
  • Earlier, I looked at the role of heterogeneous chemistry in halogen release which 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 this study.  On the subject of bromine, 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 and recent paper highlighted the effect of halogens on ozone levels in the troposphere.

Data-driven science.  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', the ESMValTool project and in 2022 I was resident on the Cambridge Accelerate Machine Learning Academy.  An example paper that Seb Hickman presented on the use of ML techniques to forecast ozone can be found here.


Currently, I am a senior research fellow in chemistry and graduate tutor at Robinson College, for whom I have supervised at Part IA, IB 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 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 for Part III and for the probationary review of the PhD.



Interactions between atmospheric composition and climate change - progress in understanding and future opportunities from AerChemMIP, PDRMIP, and RFMIP
S Fiedler, V Naik, FM O'Connor, CJ Smith, P Griffiths, RJ Kramer, T Takemura, RJ Allen, U Im, M Kasoar, A Modak, S Turnock, A Voulgarakis, D Watson-Parris, DM Westervelt, LJ Wilcox, A Zhao, WJ Collins, M Schulz, G Myhre, PM Forster
– Geoscientific Model Development
Analysis of UKESM1-StratTrop CCMI2022 experiments with a focus on ozone trends
P Griffiths, J Keeble, L Abraham
Modelling the Global Uncertainty of Hydrogen Deposition
M Brown, A Archibald, L Abraham, N Warwick, P Griffiths
Estimating the causal effect of temperature on ozone air pollution
S Hickman, P Griffiths, P Nowack, A Archibald
Historical sulfate aerosol formation in earth system model with interactive-chemistry: interplay between emission location, seasonality, meteorology and available oxidants
V Sakulsupich, P Griffiths, A Archibald
Uncertainties in tropospheric ozone changes due to natural precursor emissions
X Ye, X Wang, D Li, P Griffiths, A Archibald, L Zhang
Short-term forecasting of ozone air pollution across Europe with transformers
SHM Hickman, PT Griffiths, PJ Nowack, AT Archibald
– Environmental Data Science
Development, intercomparison and evaluation of an improved mechanism for the oxidation of dimethyl sulfide in the UKCA model
BA Cala, S Archer-Nicholls, J Weber, NL Abraham, PT Griffiths, L Jacob, YM Shin, LE Revell, M Woodhouse, AT Archibald
– Atmospheric Chemistry and Physics
Atmospheric composition and climate impacts of a future hydrogen economy
NJ Warwick, AT Archibald, PT Griffiths, J Keeble, FM O'Connor, JA Pyle, KP Shine
– Atmospheric Chemistry and Physics
The Regional Aerosol Model Intercomparison Project (RAMIP)
LJ Wilcox, RJ Allen, BH Samset, MA Bollasina, PT Griffiths, J Keeble, MT Lund, R Makkonen, J Merikanto, D O'Donnell, DJ Paynter, GG Persad, ST Rumbold, T Takemura, K Tsigaridis, S Undorf, DM Westervelt
– Geoscientific Model Development
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Centre Highlights

• January 2024: The CCPG have successfully submitted a proposal for PACESETTERS!

• September 2nd 2023: Dr Annela Anger-Kraavi has co-authored a paper analysing just transition narratives in European coal regions. Read the paper here

• December 13th 2022: The CCPG have co-authored a paper on game-changing innovations towards net-zero, published in Energy Strategy Reviews. Read the open access paper here.

• November 15th 2022: The final conference of PARIS REINFORCE is taking place today in Sorbonne. Read more about the event here

• October 24th 2022: The CCPG have successfully submitted a proposal for the Cambridge-Tsinghua joint research initiative! 

• 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

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


NCAS Research Scientist

Research Interest Group

Telephone number

01223 748889

Email address