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Centre for Atmospheric Science

Director of Research

I am a Director of Research in the Department, equivalent to Professor (Grade 12). I am a member of the National Centre for Atmospheric Science, where I am also the Training Theme Leader, working at the Centre for Atmospheric Science here in the Department.

I work with the United Kingdom Chemistry and Aerosols community chemistry-aerosol-climate model. This is based on the Met Office Unified Model, and is a collaboration between the Universities of Cambridge, Leeds, Oxford, and the Met Office.

I am a Fellow of the Software Sustainability Institute and have written blogs on how to use virtual machines for training and the benefits of in-person training, as well as co-authoring a blog on how to write good research software. I was also interviewed by the Naked Scientists podcast, discussing climate modelling and what can go wrong and how to fix it.

I am a member of NCAS Computational Modelling Services and provide model support for UKCA on both ARCHER2 and Monsoon2. If you require support please raise a ticket with the CMS Helpdesk, or if you would like to know more about UKCA in general, please email me, or browse through the UKCA wiki. This provides information about the model, the standard jobs that are available, publications using the model, and also a tutorial covering how to get started with the model and add in new chemistry, emissions, species etc.

Research Interests

I am interested in chemistry-climate interactions and Earth-system modelling. I joined the group to work on the QUEST Earth-System Model that was based around the UKCA chemistry-aerosol-climate model. This is part of the UM and forms the chemistry and aerosol components of UKESM, the UK joint NERC-Met Office Earth-system model.

A lot of my past work has been on the development of a coupled atmosphere-ocean-chemistry model, using the MetUM atmosphere and NEMO/CICE, as covered in an NCAS research highlight. I am also been involved with the CCMI project. The video below follows the evolution of the Total Ozone Column from 1960-2100 from one of our REF-C2 ensemble members that was submitted to CCMI-1.

As part of my work on model development I am interested in the coupling of UKCA to the Unified Model, as well as other sub-models. The diagram below shows the couplings from the UM to the UKCA model.


I have developed a series of UKCA Tutorials. These tutorials are designed to be run in your own time, although I also run a face-to-face tutorial which covers the contents. You can use the Met Office Virtual Machine to go through the materials on a PC or the JASMIN unmanaged cloud or on AWS. I have discussed using this approach for online training at the JASMIN User Seminar Series and the SemtembRSE online conference. I am also a Carpentries Instructor.

Since 2015 UKCA training has been held in the Department, with the 2018 lectures recorded and available online. Details of future courses can be found on the NCAS website.

The image belows shows part of the emissions task - the regridding of emissions data from 0.5x0.5 degress to UM N96 resolution.

Current PhD Projects

I am currently advertising two PhD projects within the NERC C-CLEAR DTP in the University:

You should apply for these by following the links on the above pages, but please contact me for any further information.

I am also involved with the following PhD project from the NERC CENTA DTP at the University of Birmingham:



Chemistry-albedo feedbacks offset up to a third of forestation’s CO2 removal benefits
J Weber, JA King, NL Abraham, DP Grosvenor, CJ Smith, YM Shin, P Lawrence, S Roe, DJ Beerling, MV Martin
– Science
Data supporting the North Atlantic Climate System: Integrated Studies (ACSIS) programme, including atmospheric composition, oceanographic and sea ice observations (2016–2022) and output from ocean, atmosphere, land and sea-ice models (1950–2050)
AT Archibald, B Sinha, M Russo, E Matthews, F Squires, NL Abraham, S Bauguitte, T Bannan, T Bell, D Berry, L Carpenter, H Coe, A Coward, P Edwards, D Feltham, D Heard, J Hopkins, J Keeble, EC Kent, B King, IR Lawrence, J Lee, CR Macintosh, A Megann, BI Moat, K Read, C Reed, M Roberts, R Schiemann, D Schroeder, T Smyth, L Temple, N Thamban, L Whalley, S Williams, H Wu, M-X Yang
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
NUMAC: Description of the Nested Unified Model With Aerosols and Chemistry, and Evaluation With KORUS-AQ Data
H Gordon, KS Carslaw, AA Hill, PR Field, NL Abraham, A Beyersdorf, C Corr-Limoges, P Ghosh, J Hemmings, AC Jones, C Sanchez, X Wang, J Wilkinson
– Journal of Advances in Modeling Earth Systems
Description and evaluation of the new UM–UKCA (vn11.0) Double Extended Stratospheric–Tropospheric (DEST vn1.0) scheme for comprehensive modelling of halogen chemistry in the stratosphere
EM Bednarz, R Hossaini, NL Abraham, MP Chipperfield
– Geoscientific Model Development
Stratospheric water vapor affecting atmospheric circulation
E Charlesworth, F Plöger, T Birner, R Baikhadzhaev, M Abalos, NL Abraham, H Akiyoshi, S Bekki, F Dennison, P Jöckel, J Keeble, D Kinnison, O Morgenstern, D Plummer, E Rozanov, S Strode, G Zeng, T Egorova, M Riese
– Nature communications
Climate Projections Very Likely Underestimate Future Volcanic Forcing and Its Climatic Effects
MM Chim, TJ Aubry, NL Abraham, L Marshall, J Mulcahy, J Walton, A Schmidt
– Geophysical Research Letters
ARTN e2023GL103743
Seasonal, interannual and decal variability of Tropospheric Ozone in the North Atlantic: Comparison of UM-UKCA and remote sensing observations for 2005-2018
MR Russo, BJ Kerridge, NL Abraham, J Keeble, BG Latter, R Siddans, J Weber, PT Griffiths, JA Pyle, AT Archibald
– Atmospheric Chemistry and Physics
Large Simulated Future Changes in the Nitrate Radical Under the CMIP6 SSP Scenarios: Implications for Oxidation Chemistry
S Archer-Nicholls, R Allen, NL Abraham, PT Griffiths, AT Archibald
– Atmospheric Chemistry and Physics
Development, intercomparison and evaluation of an improved mechanism for the oxidation of dimethyl sulfide
A Archibald, B Cala, S Archer-Nicholls, NL Abraham, P Griffiths, L Jacob, M Shin, L Revell, M Woodhouse
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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

Telephone number

01223 748899

Email address