Dong, Yuanxu ORCID: https://orcid.org/0000-0002-1468-1623, Bakker, Dorothee C. E. ORCID: https://orcid.org/0000-0001-9234-5337, Bell, Thomas G., Huang, Boyin, Landschützer, Peter, Liss, Peter S. and Yang, Mingxi (2022) Update on the temperature corrections of global air-sea CO2 flux estimates. Global Biogeochemical Cycles, 36 (9). ISSN 0886-6236
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Abstract
The oceans are a major carbon sink. Sea surface temperature (SST) is a crucial variable in the calculation of the air-sea carbon dioxide (CO2) flux from surface observations. Any bias in the SST or any upper ocean vertical temperature gradient (e.g., the cool skin effect) potentially generates a bias in the CO2 flux estimates. A recent study suggested a substantial increase (∼50% or ∼0.9 Pg C yr−1) in the global ocean CO2 uptake due to this temperature effect. Here, we use a gold standard buoy SST data set as the reference to assess the accuracy of insitu SST used for flux calculation. A physical model is then used to estimate the cool skin effect, which varies with latitude. The bias-corrected SST (assessed by buoy SST) coupled with the physics-based cool skin correction increases the average ocean CO2 uptake by ∼35% (0.6 Pg C yr−1) from 1982 to 2020, which is substantially smaller than the previous correction. After these temperature considerations, we estimate an average net ocean CO2 uptake of 2.2 ± 0.4 Pg C yr−1 from 1994 to 2007 based on an ensemble of surface observation-based flux estimates, in line with the independent interior ocean carbon storage estimate corrected for the river induced natural outgassing flux (2.1 ± 0.4 Pg C yr−1).
Item Type: | Article |
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Faculty \ School: | Faculty of Science > School of Environmental Sciences University of East Anglia Research Groups/Centres > Theme - ClimateUEA |
UEA Research Groups: | Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences Faculty of Science > Research Groups > Climatic Research Unit |
Related URLs: | |
Depositing User: | LivePure Connector |
Date Deposited: | 21 Oct 2022 11:32 |
Last Modified: | 08 Dec 2024 01:35 |
URI: | https://ueaeprints.uea.ac.uk/id/eprint/89260 |
DOI: | 10.1029/2022GB007360 |
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