Key Research Interests

My main research interests are the carbon cycle, climate change, and ocean biogeochemistry. More specifically, my research focuses on making atmospheric carbon dioxide and oxygen measurements to a very high precision, with a view to gaining insight into regional and global carbon cycle processes.


My Ph.D. research involved making continuous shipboard measurements of atmospheric O2 and CO2 along a transect of the Atlantic Ocean, in order to obtain greater understanding about the oceanic processes that regulate atmospheric CO2 and O2, specifically looking at equatorial outgassing. The high frequency of data obtained from making these continuous measurements enables analyses on a range of temporal and spatial scales, and contributes to the global greenhouse gas measurement network. This work is ongoing as part of the SONATA project.

As a side project, I also developed a method for quantifying the fossil fuel CO2 component of total CO2 using atmospheric potential oxygen (APO) data from Norfolk, UK.


Urban fossil fuel CO2 quantification


I am currently working for the University of Heidelberg on top-down fossil fuel CO2 quantification methods using new atmospheric O2 measurements and existing radiocarbon measurements in the city of Heidelberg, within the framework of ICOS.




I have on-going involvement with the OXYFLUX project, where high-precision atmospheric oxygen measurements are being used to make chamber, branch bag and flux measurements in forest and agricultural environments. It is anticipated that these new atmospheric O2 and CO2 measurements will enable the separation of gross photosynthesis and respiration fluxes in these environments.

Research Group Membership

I am currently working with Ingeborg Levin and Samuel Hammer at the University of Heidelberg, Germany, and with Corinne Le Quéré at UEA. My primary Ph.D. supervisor was Bill Sturges, with additional supervision provided by Corinne Le Quéré and Andrew Manning. I have ongoing collaborations with Alexander Knohl (University of Goettingen, Germany), Britt Stephens (National Center for Atmospheric Research, USA), Nathalie Lefèvre (Laboratoire d'Oceanographie et du Climat, France), and Gordon Brailsford and Sara Mikaloff-Fletcher (both of the National Institute of Water and Atmospheric Research, New Zealand).

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