• Telephone: 858-534-9944
• Email: hgraven@ucsd.edu
• Location: 206 Vaughan Hall

Heather is conducting research on radiocarbon in the global carbon cycle using measurements from the CO₂ flask program. She is also investigating anthropogenic emissions of CO₂ and other trace gases.

Research Interests

• Interactions of biogeochemistry and climate
• Sources and sinks of anthropogenic CO₂
• Radiocarbon in the global carbon cycle
• Testing of atmospheric and oceanic transport models with chemical tracers
• Observational method development

Education

• B.S., California Institute of Technology
• M.S., Ph.D., University of California, San Diego

Selected Publications

• Graven, H.D., N. Gruber, R. Key and S. Khatiwala (in preparation). Changing controls on air-sea fluxes and the redistribution of oceanic radiocarbon.
• Graven, H.D., T.P. Guilderson, and R.F. Keeling (2012), Observations of radiocarbon in CO₂ at La Jolla, California, 1992-2007, Journal of Geophysical Research, doi:10.1029/2011JD016533, in press.
• Graven, H.D., T.P. Guilderson, and R.F. Keeling (2012), Observations of radiocarbon in CO₂ at seven global sampling sites in the Scripps flask network, Journal of Geophysical Research, doi:10.1029/2011JD016535, in press.
• Graven, H.D. and N. Gruber (2011). Continental-scale enrichment of atmospheric ¹⁴CO₂ from the nuclear power industry: Potential impact on the estimation of fossil fuel-derived CO₂, Atmospheric Chemistry and Physics, 11, 12,339–12,349, doi:10.5194/acp-11-12339-2011.
• Graven, H.D., B.B. Stephens, T.P. Guilderson, T.L. Campos, D.S. Schimel, J.E. Campbell and R.F. Keeling (2009). Vertical profiles of biospheric and fossil fuel-derived CO₂ and fossil fuel CO₂:CO ratios from airborne measurements of Delta-¹⁴C and CO₂ above Colorado, USA, Tellus B, 61 (3), 536-546.
• Graven, H.D., T.P. Guilderson and R.F. Keeling (2007). Methods for high-precision ¹⁴C AMS measurement of atmospheric CO₂ at LLNL, Radiocarbon, 49 (2), 349-356.