Gretchen Keppel-Aleks

Gretchen Keppel-Aleks

Associate Professor


2516 Climate & Space Research Building
2455 Hayward Street
Ann Arbor, MI 48109-2143

Related links


  • PhD California Institute of Technology; Environmental Science and Engineering
  • MS California Institute of Technology; Environmental Science and Engineering
  • SB Massachusetts Institute of Technology; Chemical Engineering

Professional Service

  • Co-Chair for North American Carbon Project (NACP) Principal Investigator’s Meeting, March 2020.
  • Co-Chair for Community Earth System Model (CESM) Biogeochemistry Working Group, September 2017-present.
  • Atmospheric lead for International Land Model Benchmarking (ILAMB) project.
  • Member, NASA’s Orbiting Carbon Observatory (OCO) Science Team, March 2015 – present.

Research Interests

  • Carbon cycle-climate interactions
  • Remote sensing of atmospheric trace gases and vegetation properties
  • Earth System modeling
  • Atmospheric tracer transport


  • Kavli Fellow (National Academy of Sciences), 2018
  • NASA Group Achievement Award (OCO-2 Science Team), 2018
  • NOAA Climate and Global Change Postdoctoral Fellowship, 2011-2013
  • American Association of University Women dissertation fellowship, 2009-2010
  • NSF Graduate Research Fellowship, 2006-2009
  • Vito Vanoni Graduate Fellowship, 2004-2005


Selected Publications

  • Keppel-Aleks, G., J. T. Randerson, K. Lindsay, B. B. Stephens, J. K. Moore, S. C. Doney, P. E. Thornton, N. M. Mahowald, F. M. Hoffman, C. Sweeney, P. P. Tans, P. O. Wennberg, S. C. Wofsy: Atmospheric carbon dioxide variability in the Community Earth System Model: Evaluation and transient dynamic during the 20th and 21st centuries, J. Climate, 26, 4447-4475, 2013.
  • Keppel-Aleks, G., P. O. Wennberg, C. W. O’Dell, and D. Wunch: Towards constraints on fossil fuel emis- sions from total column carbon dioxide, Atmos. Chem. Phys. 13, 4349-4357, 2013.
  • Keppel-Aleks, G., P.O. Wennberg, T. Schneider, R.A. Washenfelder, D. Wunch, G.C. Toon, R.J. Andres, J.-F. Blavier, B. Connor, K.J. Davis, A.R. Desai, J. Messerschmidt, J. Notholt, C.M. Roehl, V. Sherlock, B.B. Stephens, S.A. Vay, and S.C. Wofsy: The imprint of surface fluxes and atmospheric transport on variations in total column carbon dioxide, Biogeosciences, 9, 875–891, 2012.
  • Wunch, D., P.O. Wennberg, G.C. Toon, B.J. Connor, B. Fisher, G.B. Osterman, C. Frankenberg, L. Man- drake, C. O’Dell, P. Ahonen, S.C. Biraud, R. Casano, N. Cressie, D. Crisp, N.M. Deutscher, A. Eldering, M.L. Fisher, D.W.T. Griffith, M. Gunson, P. Heikkinen, G. Keppel-Aleks, E. Kyro, R. Lindenmaier, R. Macatangay, J. Messerschmidt, C.E. Miller, I. Morino, J. Notholt, F.A. Oyafuso, M. Rettinger, J. Robin- son, C.M. Roehl, R.J. Salawitch, V. Sherlock, K. Strong, R. Sussmann, T. Tanaka, D.R. Thompson, O. Uchino, T. Warneke, and S.C. Wofsy: A method for evaluating bias in global measurements of CO2 from space, Atmos. Chem. Phys, 11, 12317–12337, 2011.
  • Keppel-Aleks, G., P.O. Wennberg, and T. Schneider: Sources of variations in total column carbon dioxide, Atmos. Chem. Phys., 11, 3581–3593, 2011.
  • Wunch, D., G.C. Toon, P.O. Wennberg, S.C. Wofsy, B. B. Stephens, M.L. Fischer, O. Uchino, J.B. Abshire, P. Bernath, S.C. Biraud, J.F. Blavier, C. Boone, K.P. Bowman, E.V. Browell, T. Campos, B.J. Connor, B.C. Daube, N.M. Deutscher, M. Diao, J.W. Elkins, C. Gerbig, E. Gottlieb, D.W.T. Griffith, D.F. Hurst, R. Jimenez, G. Keppel-Aleks, E. A. Kort, R. Macatangay, T. Machida, H. Matsueda, F. Moore, I. Morino, S. Park, J. Robinson, C.M. Roehl, Y. Sawa, V. Sherlock, C. Sweeney, T. Tanaka, and M.A. Zondlo: Calibration of the Total Carbon Column Observing Network using aircraft profile data, Atmos. Meas. Tech., 3, 1351–1362, 2010.
  • Wunch, D., P.O. Wennberg, G.C. Toon, G. Keppel-Aleks, Y.G. Yavin: Emissions of greenhouse gases from a North American megacity, Geophys. Res. Lett., 36, L15810, 2009.
  • Keppel-Aleks, G., G.C. Toon, P.O. Wennberg, N.M. Deutscher: Reducing the impact of source brightness fluctuations on spectra obtained by Fourier Transform Spectrometry, Appl. Optics, 46, 4774–4779, 2007.
  • Yang, Z., R.A. Washenfelder, G. Keppel-Aleks, N.Y. Krakauer, J.T. Randerson, P.P. Tans, C. Sweeney, P.O. Wennberg: New constraints on Northern Hemisphere growing season net flux, Geophys. Res. Lett, 34, L12807, 2007.