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

Autor: Kuai L; Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA., Parazoo NC; Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA., Shi M; Pacific Northwest National Laboratory Richland WA USA., Miller CE; Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA., Baker I; Colorado State University Fort Collins CO USA., Bloom AA; Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA., Bowman K; Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA., Lee M; Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA., Zeng ZC; University of California Los Angeles JIFRESSE Los Angeles CA USA., Commane R; Lamont-Doherty Earth Observatory at Columbia University Palisades NY USA., Montzka SA; NOAA Global Monitoring Laboratory Boulder CO USA., Berry J; Stanford University Stanford CA USA., Sweeney C; NOAA Global Monitoring Laboratory Boulder CO USA., Miller JB; NOAA Global Monitoring Laboratory Boulder CO USA., Yung YL; Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA.; California Institute of Technology Pasadena CA USA.
Jazyk: angličtina
Zdroj: Global biogeochemical cycles [Global Biogeochem Cycles] 2022 Sep; Vol. 36 (9), pp. e2021GB007216. Date of Electronic Publication: 2022 Sep 07.
DOI: 10.1029/2021GB007216
Abstrakt: 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 (Norton et al. 2019, https://doi.org/10.5194/bg-16-3069-2019). 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.
(© 2022 Jet Propulsion Laboratory. California Institute of Technology. Government sponsorship acknowledged. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA.)
Databáze: MEDLINE
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