Peak growing season gross uptake of carbon in North America is largest in the Midwest USA

Timothy W. Hilton (), Mary E. Whelan, Andrew Zumkehr, Sarika Kulkarni, Joseph A. Berry, Ian T. Baker, Stephen A. Montzka, Colm Sweeney, Benjamin R. Miller and J. Elliott Campbell
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Timothy W. Hilton: Sierra Nevada Research Institute, University of California
Mary E. Whelan: Sierra Nevada Research Institute, University of California
Andrew Zumkehr: Sierra Nevada Research Institute, University of California
Sarika Kulkarni: Center for Global and Regional Environmental Research, University of Iowa
Joseph A. Berry: Carnegie Institution
Ian T. Baker: Colorado State University
Stephen A. Montzka: NOAA Earth System Research Laboratory
Colm Sweeney: NOAA Earth System Research Laboratory
Benjamin R. Miller: NOAA Earth System Research Laboratory
J. Elliott Campbell: Sierra Nevada Research Institute, University of California

Nature Climate Change, 2017, vol. 7, issue 6, 450-454

Abstract: Abstract Gross primary production (GPP) is a first-order uncertainty in climate predictions. Large-scale CO2 observations can provide information about the carbon cycle, but are not directly useful for GPP. Recently carbonyl sulfide (COS or OCS) has been proposed as a potential tracer for regional and global GPP. Here we present the first regional assessment of GPP using COS. We focus on the North American growing season—a global hotspot for COS air-monitoring and GPP uncertainty. Regional variability in simulated vertical COS concentration gradients was driven by variation in GPP rather than other modelled COS sources and sinks. Consequently we are able to show that growing season GPP in the Midwest USA significantly exceeds that of any other region of North America. These results are inconsistent with some ecosystem models, but are supportive of new ecosystem models from CMIP6. This approach provides valuable insight into the accuracy of various ecosystem land models.

Date: 2017
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DOI: 10.1038/nclimate3272

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