Imperial College London


Faculty of Natural SciencesDepartment of Physics

Reader in Climate Physics



+44 (0)20 7594 5226h.graven Website




707Huxley BuildingSouth Kensington Campus





My research focuses on the global carbon cycle and its response to human activities and climate change.

Group Website


Interactions of biogeochemistry and climate

Sources and sinks of anthropogenic CO2

Radiocarbon in the global carbon cycle

Testing of atmospheric, oceanic and biospheric models with chemical tracers

Observational method development


2013-     Lecturer in Climate Physics and Earth Observation, Imperial College London

2011-13  Postdoctoral Scholar, Scripps Institution of Oceanography, University of California, San Diego

2008-10  Postdoctoral Scholar, Environmental Physics, ETH Zurich


PhD 2008, Scripps Institution of Oceanography, University of California, San Diego

MS 2003, Scripps Institution of Oceanography, University of California, San Diego

BS 2001, Chemical Engineering, California Institute of Technology



Selected Publications

Journal Articles

Graven H, Fischer ML, Lueker T, et al., 2018, Assessing fossil fuel CO₂ emissions in California using atmospheric observations and models, Environmental Research Letters, Vol:13, ISSN:1748-9326

Graven H, Allison CE, Etheridge DM, et al., 2017, Compiled records of carbon isotopes in atmospheric CO2 for historical simulations in CMIP6, Geoscientific Model Development, Vol:10, ISSN:1991-959X, Pages:4405-4417

Keeling RF, Graven HD, Welp LR, et al., 2017, Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis, Proceedings of the National Academy of Sciences of the United States of America, Vol:114, ISSN:0027-8424, Pages:10361-10366

Orr JC, Najjar RG, Aumont O, et al., 2017, Biogeochemical protocols and diagnostics for the CMIP6 Ocean Model Intercomparison Project (OMIP), Geoscientific Model Development, Vol:10, ISSN:1991-959X, Pages:2169-2199

Fischer ML, Parazoo N, Brophy K, et al., 2017, Simulating estimation of California fossil fuel and biosphere carbon dioxide exchanges combining in situ tower and satellite column observations, Journal of Geophysical Research: Atmospheres, Vol:122, ISSN:2169-897X, Pages:3653-3671

Jeong S, Newman S, Zhang J, et al., 2016, Estimating methane emissions in California's urban and rural regions using multitower observations, Journal of Geophysical Research-atmospheres, Vol:121, ISSN:2169-897X, Pages:13031-13049

Thomas RT, Prentice IC, Graven H, et al., 2016, Increased light-use efficiency in northern terrestrial ecosystems indicated by CO2 and greening observations, Geophysical Research Letters, Vol:43, ISSN:1944-8007, Pages:11339-11349

Graven HD, 2016, The carbon cycle in a changing climate, Physics Today, Vol:69, ISSN:0031-9228, Pages:48-54

Jones CD, Arora V, Friedlingstein P, et al., 2016, C4MIP - The Coupled Climate-Carbon Cycle Model Intercomparison Project: experimental protocol for CMIP6, Geoscientific Model Development, Vol:9, ISSN:1991-9603, Pages:2853-2880

Graven HD, 2015, Impact of fossil fuel emissions on atmospheric radiocarbon and various applications of radiocarbon over this century, Proceedings of the National Academy of Sciences of the United States of America, Vol:112, ISSN:1091-6490, Pages:9542-9545

Graven HD, Keeling RF, Piper SC, et al., 2013, Enhanced Seasonal Exchange of CO<sub>2</sub> by Northern Ecosystems Since 1960, Science, Vol:341, ISSN:0036-8075, Pages:1085-1089

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