B001-0002
Global CO2 recycling time and gross primary productivity of the terrestrial and oceanic biospheres

Monday, 7 December 2020
Poster
Mao-Chang Liang, Academia Sinica, Taipei, Taiwan, Amzad Hussain Laskar, Physical Research Laboratory, Ahmedabad, India, Eugeni Barkan, Hebrew University of Jerusalem, The Fredy & Nadine Herrmann Institute of Earth Sciences, Jerusalem, Israel, Sally Newman, Caltech, Pasadena, CA, United States, Mark H Thiemens, University of California San Diego, Chemistry and Biochemistry, La Jolla, CA, United States and Ravi Rangarajan, St. John's Research Institute, Bangalore, India
Abstract:
In the quest to quantify the global carbon cycle, measurements often focus on specific facets, resulting in controversial or significantly differing interpretations of the gross fluxes between the atmosphere and biosphere and incomplete representations of the changing global carbon cycles under changing climatic and environmental conditions. Global carbon and oxygen cycles are intimately linked through the interconversion between O2 and CO2 in the atmosphere. Here, we report analysis of triple oxygen isotope compositions of atmospheric O2 and CO2 with the widest geographical coverage and constrain global CO2 recycling time (1.5±0.2 yr) and gross primary productivities of terrestrial (~170-200 PgC/yr) and oceanic (~90-120 PgC/yr) biospheres. New methodologies that unify the two for gross primary production strengthen our understanding of the total carbon cycle. The new measurements and incorporation of other global data sets develop an independent approach, providing a strong constraint to biogeochemical models.
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