Professional summary

Garry has a D. Phil. in Chemistry from the University of Oxford for his work on the infrared spectroscopy of weakly-bound molecular clusters.

Garry’s current research interests cover land-atmosphere interactions (particularly biogeochemical), land surface and Earth system modelling and the use of measurements, including Earth Observation and remote sensing data, for model evaluation. Garry is the UKCEH lead of collaborative projects on the development and application of UK Earth System models. He is also the UKCEH lead for a project on peatlands (MotherShip). He was previously involved in research projects to assess and develop the methane wetland emission parameterisation in the JULES land surface model (https://jules.jchmr.org/).

Prior to joining UKCEH, Garry had an extensive background in atmospheric science, with over 25-years’ experience of atmospheric chemistry and air pollution issues. He worked on many of the issues of concern: polar ozone depletion (or ‘Ozone Holes’), acid deposition, photochemical oxidant formation in the lower troposphere and on particulate matter.  The research was initially laboratory-based but later became focused on measurements and modelling.

Garry is the Science Officer in the International Project Office of iLEAPS, the Integrated Land Ecosystem Atmospheric Processes study, a Future Earth Global Research Network. He uses his expertise in land ecosystem-atmosphere interactions to further the aims of iLEAPS and its contribution to societal challenges arising from climate change and sustainable development (https://www.ileaps.org). Garry was a member of the mission advisory group for CarbonSat (2011-2015), a candidate instrument for the European Space Agency’s Earth Explorer 8 mission.

Selected publications

Hayman Garry D. et al. , (2021), Regional variation in the effectiveness of methane-based and land-based climate mitigation options. Earth System Dynamics, 12, 513-544, http://dx.doi.org/10.5194/esd-12-513-2021

Comyn-Platt Edward et al. , (2018), Carbon budgets for 1.5 and 2°C targets lowered by natural wetland and permafrost feedbacks. Nature Geoscience, http://dx.doi.org/10.1038/s41561-018-0174-9

Harper Anna B. et al. , (2018), Land-use emissions play a critical role in land-based mitigation for Paris climate targets. Nature Communications, 9, http://dx.doi.org/10.1038/s41467-018-05340-z

Collins William J. et al. , (2018), Increased importance of methane reduction for a 1.5 degree target. Environmental Research Letters, http://dx.doi.org/10.1088/1748-9326/aab89c

Parker Robert J. et al. , (2022), Evaluation of wetland CH4 in the Joint UK Land Environment Simulator (JULES) land surface model using satellite observations. Biogeosciences, 19, 5779-5805, http://dx.doi.org/10.5194/bg-19-5779-2022

Chadburn Sarah E. et al. , (2020), Modeled microbial dynamics explain the apparent temperature sensitivity of wetland methane emissions. Global Biogeochemical Cycles, 34, http://dx.doi.org/10.1029/2020GB006678

Fisher Rebecca E. et al. , (2017), Measurement of the 13C isotopic signature of methane emissions from northern European wetlands. Global Biogeochemical Cycles, http://dx.doi.org/10.1002/2016GB005504

Hayman G.D. et al. , (2014), Comparison of the HadGEM2 climate-chemistry model against in situ and SCIAMACHY atmospheric methane data. 14, 13257-13280, http://www.atmos-chem-phys.net/14/13257/2014/acp-14-13257-2014.pdf

Ganesan A.L. et al. , (2018), Spatially-resolved isotopic source signatures of wetland methane emissions. Geophysical Research Letters, http://dx.doi.org/10.1002/2018GL077536

McNorton Joe et al. , (2016), Role of OH variability in the stalling of the global atmospheric CH4 growth rate from 1999 to 2006. Atmospheric Chemistry and Physics, 16, 7943-7956, http://dx.doi.org/10.5194/acp-16-7943-2016

Other Publications

Simpson, D., Benedictow, A., Berge, H., Bergström, R., Emberson, L. D., Fagerli, H., Hayman, G. D., Gauss, M., Jonson, J. E., Jenkin, M. E., Nyíri, A., Richter, C., Semeena, V. S., Tsyro, S., Tuovinen, J.-P., Valdebenito, Á., and Wind, P., 2012: The EMEP MSC-W chemical transport model – Part 1: Model description, Atmospheric Chemistry and Physics, 12, 7825-7865.

https://doi.org/10.5194/acp-12-7825-2012

P D Lightfoot, R A Cox, J N Crowley, M Destriau, G D Hayman, M E Jenkin, G K Moortgat and F Zabel, 1992: Organic Peroxy Radicals: Kinetics, Spectroscopy and Atmospheric Chemistry, Atmospheric Environment, 26A, 1801-1965.

https://doi.org/10.1016/0960-1686(92)90423-I

R A Cox and G D Hayman, 1988: The Stability and Photochemistry of Dimers of the ClO Radical and Implications for Antarctic Ozone Depletion, Nature, 332, 796-800.

https://doi.org/10.1038/332796a0