Scripps Institution of Oceanography, La Jolla, CA

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  • Telephone: 858-534-9944
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  • Location: 206 Vaughan Hall
Heather Graven Postdoctoral Scholar

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


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

Selected Publications

  • Graven, H.D., R.F. Keeling, S.C. Piper, P.K. Patra, B.B. Stephens, S.C. Wofsy, L.R. Welp, C. Sweeney, P.P. Tans, J.J. Kelley, B.C. Daube, E.A. Kort, G.W. Santoni and J.D. Bent (2013). Enhanced seasonal exchange of CO2 by northern ecosystems since 1960, Science, 341, 1085-1089, doi: 10.1126/science.1239207.
  • Graven, H.D., X. Xu, T.P. Guilderson, R.F. Keeling, S.E. Trumbore, and S. Tyler (2013). Comparison of independent Delta-14CO2 records at Point Barrow, Alaska. Radiocarbon, 55 (3-4), doi:10.2458/azu_js_rc.55.16220.
  • Miller, J., C. Wolak, S. Lehman, C. Allison, H.D. Graven, T. Guilderson, R. Keeling, B. LaFranchi, H. Meijer, H. Mukai, T. Nakamura, T. Nakazawa, R. Neubert, A. Smith, J. Southon, Y. Terao and X. Xu (2013). Initial Results of an Intercomparison of AMS-Based Atmospheric 14CO2 Measurements. Radiocarbon, 55 (3-4), 10.2458/azu_js_rc.55.16382.
  • Turnbull, J., H.D. Graven, J. Miller and the workshop participants (2013). Atmospheric radiocarbon workshop report. Radiocarbon, 55 (3-4), doi:10.2458/azu_js_rc.55.16216.
  • Khatiwala, S., T. Tanhua, S. Mikaloff Fletcher, M. Gerber, S.C. Doney, H.D. Graven, N. Gruber, G.A. McKinley, A. Murata, A.F. Ríos, C.L. Sabine, and J.L. Sarmiento (2013). Global ocean storage of anthropogenic carbon. Biogeosciences, 10, 2169-2191, doi:10.5194/bg-10-2169-2013.
  • Wanninkhof, R., G.-H. Park, T. Takahashi, C. Sweeney, R. Feely, Y. Nojiri, N. Gruber, S. C. Doney, G.A. McKinley, A. Lenton, C. Le Quéré, C. Heinze, J. Schwinger, H. Graven, and S. Khatiwala (2013). Global ocean carbon uptake: magnitude, variability and trends. Biogeosciences, 10, 1983-2000, doi:10.5194/bg-10-1983-2013.
  • Yver, C., H.D. Graven, D.D. Lucas, P. Cameron-Smith, R.F. Keeling, and R.F. Weiss (2013). Evaluating transport in the WRF model along the California coast. Atmospheric Chemistry and Physics, 13, 1837-1852, doi:10.5194/acp-13-1837-2013.
  • Graven, H.D., N. Gruber, R. Key, S. Khatiwala and X. Giraud (2012). Changing controls on air-sea fluxes and the redistribution of oceanic radiocarbon: New insights on shallow-to-deep ocean exchange and anthropogenic CO2 uptake. Journal of Geophysical Research, 117, C10005, doi:10.1029/2012JC008074.
  • 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, 14583-14605, doi:10.5194/acp-11-12339-2011.
  • Graven, H.D., T.P. Guilderson, and R.F. Keeling (2012). Observations of radiocarbon in CO2 at La Jolla, California, 1992-2007: Analysis of the long-term trend. Journal of Geophysical Research, 117, D02302, doi:10.1029/2011JD016533.
  • 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: Analysis of spatial gradients and seasonal cycles. Journal of Geophysical Research, 117, D02303, doi:10.1029/2011JD016535.
  • 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, CO2 and CO 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.