Quantifying Northern High Latitude Gross Primary Productivity (GPP) Using Carbonyl Sulfide (OCS)

Kuai, Le; Parazoo, Nicholas C.; Shi, Mingjie; Miller, Charles E.; Baker, Ian; Bloom, Anthony A.; Bowman, Kevin; Lee, Meemong; Zeng, Zhao‐Cheng; Commane, Roisin; Montzka, Stephen A.; Berry, Joe; Sweeney, Colm; Miller, John B.; Yung, Yuk L.

doi:10.1029/2021gb007216

Title: Quantifying Northern High Latitude Gross Primary Productivity (GPP) Using Carbonyl Sulfide (OCS)

Journal Article · Wed Aug 17 00:00:00 EDT 2022 · Global Biogeochemical Cycles

DOI:https://doi.org/10.1029/2021gb007216· OSTI ID:1887083

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California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Colorado State University, Fort Collins, CO (United States)
University of California, Los Angeles, CA (United States)
Columbia University, New York, NY (United States). Lamont-Doherty Earth Observatory
National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States)
Stanford University, CA (United States)

The northern high latitude (NHL, 40°N to 90°N) is where the second peak region of gross primary productivity (GPP) other than the tropics. The summer NHL GPP is about 80% of the tropical peak, but both regions are still highly uncertain. Carbonyl sulfide (OCS) provides an important proxy for photosynthetic carbon uptake. Here we optimize the OCS plant uptake fluxes across the NHL by fitting atmospheric concentration simulation with the GEOS-CHEM global transport model to the aircraft profiles acquired over Alaska during NASA's Carbon in Arctic Reservoirs Vulnerability Experiment (2012–2015). We use the empirical biome-specific linear relationship between OCS plant uptake flux and GPP to derive the six plant uptake OCS fluxes from different GPP data. Such GPP-based fluxes are used to drive the concentration simulations. We evaluate the simulations against the independent observations at two ground sites of Alaska. The optimized OCS fluxes suggest the NHL plant uptake OCS flux of -247 Gg S year^-1, about 25% stronger than the ensemble mean of the six GPP-based OCS fluxes. GPP-based OCS fluxes systematically underestimate the peak growing season across the NHL, while a subset of models predict early start of season in Alaska, consistent with previous studies of net ecosystem exchange. The OCS optimized GPP of 34 PgC yr^-1 for NHL is also about 25% more than the ensembles mean from six GPP data. Further work is needed to fully understand the environmental and biotic drivers and quantify their rate of photosynthetic carbon uptake in Arctic ecosystems.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE; National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: AC05-76RL01830; 80NSSC20K0215

OSTI ID:: 1887083

Report Number(s):: PNNL-SA-168099

Journal Information:: Global Biogeochemical Cycles, Vol. 36, Issue 9; ISSN 0886-6236

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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