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Yusuf Hamied Department of Chemistry

 
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.

Teaching

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.

 

Publications

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
(2020)
20,
12905
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
(2020)
12,
e2019MS002019
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
(2020)
11,
1095
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
– Proc Natl Acad Sci U S A
(2020)
117,
26651
On the changes in surface ozone over the twenty-first century: sensitivity to changes in surface temperature and chemical mechanisms: 21st century changes in surface ozone
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
(2020)
378,
20190329
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
(2020)
20,
10889
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
(2020)
12,
ARTN e2020MS002126
Ozone trends from two decades of ground level observation in Malaysia
F Ahamad, PT Griffiths, MT Latif, L Juneng, CJ Xiang
– Atmosphere
(2020)
11,
755
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
(2020)
20,
7153
Stratospheric Ozone Changes From Explosive Tropical Volcanoes: Modeling 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
(2020)
125,
ARTN e2019JD032290
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Research Group

Research Interest Group

Telephone number

01223 748889

Email address

ptg21@cam.ac.uk