B102-10
Constraining carbon cycle dynamics over the ABoVE domain using in situ and space-based CO2 observations

Tuesday, 15 December 2020: 11:57
Virtual
Abhishek Chatterjee, NASA Goddard Space Flight Center, GMAO, Greenbelt, MD, United States, Sourish Basu, NOAA, ESRL/GMD, Boulder, CO, United States, Colm Sweeney, NOAA Global Monitoring Laboratory, Boulder, CO, United States, Brendan Byrne, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, United States, Roisin Commane, Columbia University in the City of New York, New York, NY, United States, Kathryn McKain, NOAA ESRL Global Monitoring Division, Boulder, CO, United States, Lesley E Ott, NASA Goddard Space Flight Center, Greenbelt, MD, United States, Nicholas Parazoo, University of California Los Angeles, JIFRESSE, Los Angeles, CA, United States, Benjamin Poulter, NASA GSFC, Biospheric Science, Greenbelt, MD, United States, Luke D Schiferl, Harvard University, Cambridge, MA, United States, Brad Weir, NASA Goddard Space Flight Center, Global Modeling and Assimilation Office, Greenbelt, MD, United States, Sonja Wolter, NOAA Boulder, Global Monitoring Division, Boulder, CO, United States and Charles E Miller, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
Abstract:
One of the largest uncertainties in projected greenhouse gas concentrations and temperature trends is the impact from terrestrial and marine carbon-climate feedbacks, especially in the Northern high-latitudes (≥ 48° N). The presence of large carbon stocks in a rapidly warming region has raised concerns about increased carbon emissions but our understanding of the magnitude and behavior of carbon cycle dynamics over this region remains rudimentary. Here, we use observation-based constraints to track the magnitude, seasonality and inter-annual variability of land-atmosphere carbon exchange over Alaska and northwestern Canada (NASA’s Arctic-Boreal Vulnerability Experiment study domain). We will first review findings from existing studies that have successfully combined aircraft and tower observations to derive CO2 flux estimates over this, or a subset of this study domain. These studies have highlighted that while our current state-of-the-art flux estimates are able to capture large scale spatial and temporal patterns in near-surface CO2 concentrations, more work is needed to resolve fine-scale flux features that are periodically observed. We will then address the question whether high-density soundings from remote-based instruments (namely, the Greenhouse gases Observing SATellite “IBUKI” and the Orbiting Carbon Observatory-2) provide a more powerful constraint on the net sources and sinks of CO2 as well as their spatial and temporal distribution. Preliminary results suggest that the satellite datasets provide complementary regional constraints relative to in situ data over homogeneous bioclimatic zones and boreal forests but vary widely in terms of the flux constraints along the coastal areas and the Southern Arctic ecozone. Finally, we will also discuss the potential and the need for sustaining a coordinated diverse observing portfolio, comprising of airborne, remote sensing and ground measurements, in order to obtain better insight into the critical processes controlling carbon cycle dynamics over this domain.
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