Scripps Institution of Oceanography
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
B.S. California Institute of Technology, 2001
M.S. Scripps Institution of Oceanography, 2003
Ph.D. Scripps Institution of Oceanography, 2008
Dissertation: “Advancing the use of radiocarbon in studies of global and regional carbon cycling with high precision measurements of 14C in CO2 from the Scripps CO2 Program”
Committee: Ralph Keeling, Thomas Guilderson, Devendra Lal, Jeff Severinghaus, Mark Thiemens, Ray Weiss
Graven, H.D., and Gruber, N. Continental-scale enrichment of 14CO2 from the nuclear power industry and resulting biases in observation-based estimates of fossil fuel-derived CO2. In review, Geophysical Research Letters
Graven, H.D., Guilderson, T.P., and Keeling, R.F. Observations of radiocarbon in CO2 at La Jolla, California, 1992-2007. In review, Journal of Geophysical Research
Graven, H.D., Guilderson, T.P., and Keeling, R.F. Observations of radiocarbon in CO2 at seven global sampling sites in the Scripps flask network. In review, Journal of Geophysical Research
Graven, H.D., Stephens, B.B., Guilderson, T.P., Campos, T.L., Schimel, D.S., Campbell, J.E. and Keeling, R.F., 2009. Vertical profiles of biospheric and fossil fuel-derived CO2 and fossil fuel CO2:CO ratios from airborne measurements of Δ14C and CO2 above Colorado, USA, Tellus B, 61 (3), 536-546.
Graven, H.D., Guilderson, T.P., and Keeling, R.F. 2007. Methods for high-precision 14C AMS measurement of atmospheric CO2 at LLNL, Radiocarbon, 49 (2), 349-356.
Graven H.D., and N. Gruber. Evolution of air-sea 14C fluxes in recent decades and implications for Δ14C gradients in atmospheric CO2. Ocean Sciences Meeting, Portland, 2010.
Graven H.D., and N. Gruber. What caused the shifting meridional gradient of Δ14C in CO2 from 1985 to 2006? 8th International Carbon Dioxide Conference, Jena, Germany, 2009.
Graven H.D., T.P. Guilderson, and R.F. Keeling. Trends and gradients in Δ14C of atmospheric CO2 observed by the Scripps global flask network. 8th International Carbon Dioxide Conference, Jena, Germany, 2009.
Graven, H.D., T.P. Guilderson and R.F. Keeling. New Observations of Regional Variability in Delta-14C of Background CO2 from the Scripps CO2 Program. American Geophysical Union, Fall Meeting 2007.
Graven, H.D., T.P. Guilderson and R.F. Keeling. Delta-14CO2 from the Scripps CO2 Program. WMO/IAEA Meeting of Experts on Carbon Dioxide, Other Greenhouse Gases, and Related Tracer Measurement Techniques, Helsinki, Finland, September 2007.
Graven, H.D., T.P. Guilderson and R.F. Keeling. Developing high-precision measurements of 14CO2 for carbon cycle studies. North American Carbon Program Investigators Meeting, January 2007.
Graven, H.D., B.B. Stephens, R.F. Keeling, T.P. Guilderson, T.L. Campos and D.S. Schimel. Identifying CO2 sources with vertical profiles of Delta-14CO2 above Colorado. American Geophysical Union, Fall Meeting 2006.
Graven, H.D., T.P. Guilderson and R.F. Keeling. High-precision AMS 14C measurements on atmospheric CO2 samples at CAMS. 19th International Radiocarbon Conference, Oxford UK, April 2006.
Guilderson, T.P., H.D. Graven, K. Caldeira, R.F. Keeling and C.D. Keeling. 14CO2 Measurements on the Scripps Flask Archive - A Unique Tool to Study the Carbon Cycle. 17th Annual Frontiers of Science Symposium of the National Academy of Sciences, Irvine CA, October 2005.
Graven, H.D., T.P. Guilderson, R.F. Keeling and C.D. Keeling. Developing precise measurements of background 14CO2. 7th International Carbon Dioxide Conference, September 2005.
Graven, H.D., B.B. Stephens, J.B. Miller, R.F. Keeling, C. Gerbig, J. Lin and S.C. Wofsy. Airborne flask measurements of O2/N2, Ar/N2, CO2, and other species during COBRA-NA 2003. American Geophysical Union, Fall Meeting 2003.
ETH Zurich Ion Beam Physics Department, "Recent observations of Δ14C in atmospheric CO2 from the Scripps CO2 Program," 2009.
Zurich International School, "Where does the CO2 go?", 2009
Lawrence Livermore National Laboratory, Center for Accelerator Mass Spectrometry, "High precision measurements of 14C in CO2 from the Scripps CO2 Program," 2008.
San Diego State University Ecology and Evolutionary Biology Seminar. "Radiocarbon in CO2: a tool for identifying sources of CO2." October 2007.
Public Forum on Understanding Climate Change, presented by the Mission Valley Rotary Club, San Diego. "Budgeting the fate of carbon emissions using 14CO2." November 2004.
Newspaper article in the Boulder Daily Camera. "Flybys to gauge carbon dioxide levels near forests." April 30, 2004.
Newspaper article in the Boulder Daily Camera. "Flight to explore climate change." May 28, 2003.
Co-advisor, Masters Thesis Project, 2010
Mentor, "Term Paper Writing for Environmental Sciences Graduate Students," 2008 & 2009
Teaching Assistant and Guest Lecturer, “The Atmosphere,” 2005 & 2006
Teaching Assistant, “Marine Chemistry,” 2006
Activities and Awards:
Reviewer for Geophysical Research Letters, Tellus, Radiocarbon and Naturwissenschaften, 2006-10
Reviewer for NOAA’s Global Carbon Cycle Program, 2009
NASA Earth System Science Graduate Research Fellowship, 2005-08
Associate Editor for the Journal of Environment and Development at UCSD, 2003-07
Steering Committee of SIO student group for Environmental Science and Policy, 2003-07
Tinker Field Research Grant, 2002
Dean’s Cup, awarded for outstanding undergraduate leadership, Caltech, 2001
Collaborative Field Campaigns:
Airborne Carbon in the Mountains Experiment (ACME), 2004
CO2 Budget and Regional Airborne Study (COBRA) – North America, 2003
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