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Yusuf Hamied Department of Chemistry


Principle Research Associate

I am a member of the National Centre for Atmospheric Science working at the Centre for Atmospheric Science 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 a blog on how to use virtual machines for 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 also 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.

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.


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
Supplementary material to "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
Comparison of Arctic and Antarctic Stratospheric Climates in Chemistry Versus No-Chemistry Climate Models
O Morgenstern, DE Kinnison, M Mills, M Michou, LW Horowitz, P Lin, M Deushi, K Yoshida, FM O’Connor, Y Tang, NL Abraham, J Keeble, F Dennison, E Rozanov, T Egorova, T Sukhodolov, G Zeng
– Journal of Geophysical Research: Atmospheres
ARTN e2022JD037123
Lightning-induced chemistry on tidally-locked Earth-like exoplanets
M Braam, PI Palmer, L Decin, RJ Ridgway, M Zamyatina, NJ Mayne, DE Sergeev, N Luke Abraham
– Monthly Notices of the Royal Astronomical Society
Integrated ozone depletion as a metric for ozone recovery.
JA Pyle, J Keeble, NL Abraham, MP Chipperfield, PT Griffiths
– Nature
Atmospheric impacts of chlorinated very short-lived substances over the recent past – Part 1: Stratospheric chlorine budget and the role of transport
EM Bednarz, R Hossaini, MP Chipperfield, NL Abraham, P Braesicke
– Atmospheric Chemistry and Physics
Attribution of Stratospheric and Tropospheric Ozone Changes Between 1850 and 2014 in CMIP6 Models
G Zeng, O Morgenstern, JHT Williams, FM O’Connor, PT Griffiths, J Keeble, M Deushi, LW Horowitz, V Naik, LK Emmons, NL Abraham, AT Archibald, SE Bauer, B Hassler, M Michou, MJ Mills, LT Murray, N Oshima, LT Sentman, S Tilmes, K Tsigaridis, PJ Young
– Journal of Geophysical Research: Atmospheres
ARTN e2022JD036452
Climate feedback from vegetation emissions strongly dependent on modelling of atmospheric chemistry.
J Weber, S Archer-Nicholls, NL Abraham, YM Shin, P Griffiths, DP Grosvenor, CE Scott, AT Archibald
Studies of the effect of stratospheric ozone depletion on tropospheric oxidising capacity over the period 1979-2010 using the UKCA Chemistry-Climate model
P Griffiths, J Keeble, S Hickman, YM Shin, NL Abraham, J Pyle, A Archibald
Responses of Arctic sea ice to stratospheric ozone depletion.
J Zhang, W Tian, JA Pyle, J Keeble, NL Abraham, MP Chipperfield, F Xie, Q Yang, L Mu, H-L Ren, L Wang, M Xu
– Chinese Science Bulletin
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Research Groups

Telephone number

01223 748899

Email address