2025
Lombardozzi, D. L., W. R. Wieder, G. Keppel-Aleks, J. Lai, Z. Luo, Z.,Y. Sun, Y., et al.
(2025). Agricultural fertilization significantly enhances amplitude of land-atmosphere CO2 exchange.
Nature Communications, 16(1), 1742. https://doi.org/10.1038/s41467-025-56730-z
2024
Liu, Z., Rogers, B. M., G. Keppel-Aleks, M. Helbig, A. P. Ballantyne, J.S. Kimball, et al.
(2024). Seasonal CO2 amplitude in northern high latitudes. Nature Reviews Earth & Environment,
5(11), 802–817. https://doi.org/10.1038/s43017-024-00600-7
Parazoo, N.C., G. Keppel-Aleks, S. P. Sander, B. Byrne, V. Natraj, M. Luo, J.-F. Blavier,
L. Dorsky, and R. Nassar. (2024). More Frequent Spaceborne Sampling of XCO2 Improves
Detectability of Carbon Cycle Seasonal Transitions in Arctic-Boreal Ecosystems, Geophys. Res.
Lett, 51, https://doi.org/10.1029/2023GL107158.
Guan, Y., McKinley, G. A., Fay, A. R., Doney, S. C., and Keppel-Aleks, G. (2024). Oceandriven
interannual variability in atmospheric CO2 quantified using OCO-2 observations and atmospheric
transport simulations. Frontiers in Marine Science, 11. doi:/10.3389/fmars.2024.1272415.
*Gerlein-Safdi, C., P, Kohler, S. Wang, M. Flanner, G. Keppel-Aleks, and C. Frankenberg,
(2023). Algae blooms on the Greenland Ice Sheet detected through solar-induced fluorescence,
IEEE Trans. Geosci. and Remote Sensing, 61, 1-9, doi: 10.1109/TGRS.2023.3305194.
2023
Butterfield, Z., Magney, T., Grossmann, K., Bohrer, G., Vogel, C., Barr, S., and Keppel-
Aleks, G. (2023). Accounting for Changes in Radiation Improves the Ability of SIF to Track
Water Stress-Induced Losses in Summer GPP in a Temperate Deciduous Forest. J Geophys Res
Biogeosci, 128(7), e2022JG007352. https://doi.org/10.1029/2022JG007352
Guan, Y., G. Keppel-Aleks, S. C. Doney, C. Petri, D. Pollard, D. Wunch, F. Hase, H.
Ohyama, I. Morino, J. Notholt, K. Shiomi, K. Strong, R. Kivi, M. Buschmann, N. Deutscher,
P. O. Wennberg, R. Sussman, V. A. Velazco, and Y. Te, (2023), Characteristics of interannual
variability in space-based XCO2 global observations, Atmos. Chem. Phys., 23(9), 5355–5372,
doi:/10.5194/acp-23-5355-2023.
Loechli, M. M., B. B. Stephens, R. Commane, F. Chevallier, K. McKain, R. F. Keeling, E. J.
Morgan, P. K. Patra, M. R. Sargent, C. Sweeney, and G. Keppel-Aleks, (2023), Evaluating
Northern Hemisphere Growing Season Net Carbon Flux in Climate Models Using Aircraft
Observations, Global Biogeochem. Cy., 37(2), e2022GB007520, doi:/10.1029/2022GB007520
*Requena-Mullor, J. M., Steiner, A., Keppel-Aleks, G., and Ibanez, I. (2023). Tradeoffs in
forest resilience to satellite-based estimates of water and productivity losses. Remote Sensing of
Environment, 285, 113414. https://doi.org/10.1016/j.rse.2022.113414
Mitchell, K.A., S. C. Doney, and G. Keppel-Aleks, (2023), Characterizing Average Seasonal,
Synoptic, and Finer Variability in Orbiting Carbon Observatory-2 XCO2 across North America
and Adjacent Ocean Basins, J. Geophys. Res.-Atmos. 128(3), e2022JD036696, doi:/10.1029/2022JD036696
2021
Wieder, W. R., Butterfield, Z., Lindsay, K., Lombardozzi, D. L., and Keppel-Aleks, G..,
(2021), Interannual and Seasonal Drivers of Carbon Cycle Variability Represented by the Community
Earth System Model (CESM2). Global Biogeochem Cycles, 35(9), e2021GB007034.,
doi:/10.1029/2021GB007034.
Birch, L., Schwalm, C. R., Natali, S., Lombardozzi, D., Keppel-Aleks, G., Watts, J., Lin, X., Zona, D., Oechel, W., Sachs, T., Black, T. A., \& Rogers, B. M.. Addressing biases in Arctic-boreal carbon cycling in the Community Land Model Version 5. GMD, 14(6), 3361–3382. https://doi.org/10.5194/gmd-14-3361-2021, 2021.
dos Santos, T., Keppel-Aleks, G., De Roo, R., and Steiner, A. L., Can Land Surface Models Capture the Observed Soil Moisture Control of Water and Carbon Fluxes in Temperate-To-Boreal Forests? J Geophys Res Biogeosci, 126(4), e2020JG005999. https://doi.org/10.1029/2020JG005999, 2021.
Wieder, W. R., Butterfield, Z., Lindsay, K., Lombardozzi, D. L., & Keppel-Aleks, G.. Interannual and Seasonal Drivers of Carbon Cycle Variability Represented by the Community Earth System Model (CESM2). Global Biogeochem Cycles, 35(9), e2021GB007034. https://doi.org/10.1029/2021GB007034, 2021.
2020
Butterfield, Z, W. Buermann, G. Keppel-Aleks, “Satellite observations reveal seasonal redistribution of northern ecosystem productivity in response to interannual climate variability”, Remote Sensing of Environment.
Basile, S. J., X. Lin, W. R. Wieder, M. D. Hartman, G. Keppel-Aleks, “Leveraging the signature of heterotrophic respiration on atmospheric CO2 for model benchmarking”, Biogeosciences.
Byrne, B., Liu, J., Bloom, A. A., Bowman, K. W.,Butterfield, Z., Joiner, J., Keenan, T. F., Keppel-Aleks, G., Parazoo, N. C., \& Yin, Y. (2020). Contrasting Regional Carbon Cycle Responses to Seasonal Climate Anomalies Across the East-West Divide of Temperate North America. Global Biogeochem. Cycles, 34(11), e2020GB006598. https://doi.org/10.1029/2020GB006598
Gerlein-Safdi, C., G. Keppel-Aleks, F. Wang, S. Frolking, D. L. Mauzerall, “Satellite monitoring of natural reforestation efforts in China’s drylands”, One Earth.
Lin, X., B.M. Rogers, C. Sweeney, F. Chevallier, M. Arshinov, E. Dlugokencky, T. Machida, M. Sasakawa, P.P. Tans, and G. Keppel-Aleks, Siberian and temperate ecosystems shape Northern Hemisphere atmospheric CO2 seasonal amplification, Proc. Nat. Acad. Sciences, 117, https://doi.org/10.1073/pnas.1914135117.
Wozniak, M.C., G.B. Bonan, G. Keppel‐Aleks, A.L. Steiner, “Influence of vertical heterogeneities in the canopy microenvironment on interannual variability of carbon uptake in temperate deciduous forests“, Journal of Geophysical Research: Biogeosciences 125 (8), e2020JG005658
2019
Lawrence, D. M., R.A., Fisher, C. D. Koven, K W. Oleson, S. C. Swenson, G. Bonan, N. Collier, B. Ghimire, L. van Kampenhout, D. Kennedy, E. Kluzek, P. J. Lawrence, F. Li, H. Li, D. Lombardozzi, W. J. Riley, W. J. Sacks, M. Shi, M. Vertenstein, W. R. Wieder, C. Xu, A. A. Ali, A. M. Badger, G. Bisht, M. A. Brunke, S. P. Burns, J. Buzan, M. Clark, A. Craig, K. Dahlin, B. Drewniak, J. B. Fisher, M. Flanner, A. M. Fox, P. Gentine, F. Hoffman, G. Keppel- Aleks, R. Knox, S. Kumar, J. Lenaerts, L. R. Leung, W. H. Lipscomb, Y. Lu, A. Pandey, J. D. Pelletier, J. Perket, J. T. Randerson, D. M. RIcciuto, B. M. Sanderson, A. Slater, Z. M. Subin, J. Tang, R. Q. Thomas, M. Val Martin, X. Zeng, “The Community Land Model version 5: Description of new features, benchmarking, and impact of forcing uncertainty”, Journal of Advances in Modeling the Earth System.
Zhu, P., S. J. Cheng, Z. Butterfield, G. Keppel-Aleks, A. L. Steiner, “The Global Influence of Cloud Optical Thickness on Terrestrial Carbon Uptake”, Earth Interactions.
Torres, A. D., G. Keppel-Aleks, S. C. Doney, M. A. Fendrock, K. Luis, M. de Maziere, F. Hase, C. Petri, D. F. Pollard, C. M. Roehl, R. Sussman, V. A. Velazco, T. Warneke, D. Wunch “A geostatistical framework for quantifying the imprint of mesoscale atmospheric transport on satellite trace gas retrievals”. Journal of Geophysical Research-Atmosphere.
2018
Collier, N., F. M. Hoffman, D. M. Lawrence, G. Keppel-Aleks, C. D. Koven, W. J. Riley, M. Mu, and J. T. Randerson, The ILAMB benchmarking system: Design, theory, and implementation, J. Advances in Modeling Earth Systems, 10, 2731-2754,2018, doi://10.1029/2018MS001354. link
Hamilton, M, A. P. Fischer, S. D. Guikema, G. Keppel-Aleks: Behavioral adaptation to climate change in wildfire-prone forests, WIREs Climate Change, doi:10.1002/wcc.554, 2018. link
Keppel-Aleks, G., S. J. Basile, and F. M. Hoffman: A functional response metric for the temperature sensitivity of tropical ecosystems, Earth Interactions, 7, doi:10.1175/EI-D-17-0017.1, 2018. link
2017
J. Liptak, G. Keppel-Aleks, and K. Lindsay: Drivers of multi-century trends in the atmospheric CO2 mean annual cycle in a prognostic ESM, Biogeosciences, 14, 1383-1401, 2017/ link
2016
G. Keppel-Aleks and R. A. Washenfelder: The effect of atmospheric sulfate reductions on diffuse radiation and photosynthesis in the United States during 1995-2013, Geophysical Research Letters, 43, 9984-9993, 2016. link
link to EOS article about research
2014
G. Keppel-Aleks, A. S. Wolf, M. Mu, S. C. Doney, D. C. Morton, P. S. Kasibhatla, J. B. Miller, E. J. Dlugokencky, and J. T. Randerson: Separating the influence of temperature, drought, and fire on interannual variability in atmospheric CO2, Global Biogeochemical Cycles, 28, 1295-1310, 2014. link
2013
Wunch, D., P.O. Wennberg, J. Messerschmidt, N. Parazoo, G.C. Toon, N.M. Deutscher, G. Keppel-Aleks, C.M. Roehl, J. T. Randerson, T. Warneke, J. Notholt, and A. Jacobson: The covariation of northern hemisphere XCO2 seasonal cycle minima with high- latitude surface temperature, Biogeosciences, in press.
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. link
Keppel-Aleks, G., P. O. Wennberg, C. W. O’Dell, and D. Wunch: Towards constraints on fossil fuel emissions from total column carbon dioxide, Atmos. Chem. Phys. 13, 4349-4357, 2013. link
2012
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. link
2011
Wunch, D., P.O. Wennberg, G.C. Toon, B.J. Connor, B. Fisher, G.B. Osterman, C. Frankenberg, L. Mandrake, 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. Robinson, 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. link
Keppel-Aleks, G., P.O. Wennberg, and T. Schneider, (2011), “Sources of variations in total column carbon dioxide”, Atmos. Chem. Phys, 10. link
Butz, A. and coauthors, (2011), “Toward accurate CO2 and CH4 observations from GOSAT”, Geophys. Res. Lett., 38. link
Reuter, M. and coauthors, (2011), “Retrieval of atmospheric CO2 with enhanced accuracy and precision from SCIAMACHY: Validation with FTS measurements and comparison with model results”, J. Geophys. Res. link
2005-2010
Wunch, D. and coauthors, (2010), “Calibration of the Total Carbon Column Observing Network against aircraft profile data”, Atmos. Meas. Tech., 3. link Deutscher, N.M. and coauthors, (2010), “Total column CO2 measurements at Darwin, Australia – site description and calibration against in situ aircraft profiles,” Atmos. Meas. Tech., 3. link
Wunch, D., P.O. Wennberg, G.C. Toon, G. Keppel-Aleks, Y.G. Yavin, (2009), “Emissions of greenhouse gases from a North American megacity”, Geophys. Res. Lett, 36. link
Keppel-Aleks, G., G. C. Toon, P. O. Wennberg, and N. M. Deutscher, (2007), “Reducing the impact of source brightness fluctuations on spectra obtained by Fourier-transform spectrometry,” Appl. Opt. 46, 4774-4779. link
Yang, Z., R. A. Washenfelder, G. Keppel-Aleks, N. Y. Krakauer, J. T. Randerson, P. P. Tans, C. Sweeney, and P. O. Wennberg, (2007), “New constraints on Northern Hemisphere growing season net flux”, Geophys. Res. Lett., 34, L12807, doi:10.1029/2007GL029742. link
Zuberi, B., K. S. Johnson, G. K. Aleks, L. T. Molina, M. J. Molina, and A. Laskin, (2005), “Hydrophilic properties of aged soot”, Geophys. Res. Lett., 32, L01807, doi:10.1029/2004GL021496. link