Imperial College London


Faculty of Natural SciencesDepartment of Physics

Lecturer in Climate Physics and Earth Observation



+44 (0)20 7594 5226h.graven




707Huxley BuildingSouth Kensington Campus





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

PHD student opportunities for 2018

SSCP DTP: Estimating and attributing regional methane emissions using innovative atmospheric measurements

QMEE CDT: New insights on terrestrial carbon cycling and CO2 uptake from modelling of carbon isotopes


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

Keeling RF, Graven HD, Welp LR, et al., 2017, Atmospheric evidence for a global secular increase in carbon isotopic discrimination of land photosynthesis., Proc Natl Acad Sci U S A, Vol:114, 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

Graven HD, 2016, THE CARBON CYCLE in a changing climate, Physics Today, Vol:69, ISSN:0031-9228, Pages:48-54

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 LC, 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:0094-8276, Pages:11339-11349

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:1991-959X, 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:0027-8424, Pages:9542-9545

Graven HD, Keeling RF, Piper SC, et al., 2013, Enhanced Seasonal Exchange of CO2 by Northern Ecosystems Since 1960, Science, Vol:341, ISSN:0036-8075, Pages:1085-1089

More Publications