Update on the Temperature Corrections of Global Air-Sea CO2 Flux Estimates
Type | Article | ||||||||||||||||
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Date | 2022-09 | ||||||||||||||||
Language | English | ||||||||||||||||
Author(s) | Dong Yuanxu1, 2, Bakker Dorothee C. E.1, Bell Thomas G.2, Huang Boyin3, Landschutzer Peter4, Liss Peter S.1, Yang Mingxi2 | ||||||||||||||||
Affiliation(s) | 1 : Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, UK 2 : Plymouth Marine Laboratory, Prospect Place, Plymouth, UK 3 : National Centers for Environmental Information, National Oceanic and Atmospheric Administration, Ashddeeville, NC, USA 4 : Max Planck Institute for Meteorology, Hamburg, Germany |
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Source | Global Biogeochemical Cycles (0886-6236) (Amer Geophysical Union), 2022-09 , Vol. 36 , N. 9 , P. e2022GB007360 (13p.) | ||||||||||||||||
DOI | 10.1029/2022GB007360 | ||||||||||||||||
WOS© Times Cited | 7 | ||||||||||||||||
Keyword(s) | air-sea CO2 flux, temperature effects, updated correction | ||||||||||||||||
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 (similar to 50% or similar to 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 similar to 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)). |
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