The Variability of Air-sea O_(2)Flux in CMIP6:Implications for Estimating Terrestrial and Oceanic Carbon Sinks  

作　　者：Changyu LI Jianping HUANG Lei DING Yu REN Linli AN Xiaoyue LIU Jiping HUANG 

机构地区：[1]College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China [2]Collaborative Innovation Center for Western Ecological Safety,Lanzhou University,Lanzhou 730000,China [3]Enlightening Bioscience Research Center,Mississauga,L4X 2X7,Canada

出　　处：《Advances in Atmospheric Sciences》2022年第8期1271-1284,I0024-I0026,共17页大气科学进展（英文版）

基　　金：the World Climate Recruitment Programme’s (WCRP) Working Group on Coupled Modelling (WGCM);the Global Organization for Earth System Science Portals (GO-ESSP);jointly supported by the National Science Foundation of China (Grant Nos. 41991231, 91937302);the China 111 project (Grant No. B13045);supported by Supercomputing Center of Lanzhou University

摘　　要：The measurement of atmospheric O_(2)concentrations and related oxygen budget have been used to estimate terrestrial and oceanic carbon uptake.However,a discrepancy remains in assessments of O_(2)exchange between ocean and atmosphere(i.e.air-sea O_(2)flux),which is one of the major contributors to uncertainties in the O_(2)-based estimations of the carbon uptake.Here,we explore the variability of air-sea O_(2)flux with the use of outputs from Coupled Model Intercomparison Project phase 6(CMIP6).The simulated air-sea O_(2)flux exhibits an obvious warming-induced upward trend(~1.49 Tmol yr−2)since the mid-1980s,accompanied by a strong decadal variability dominated by oceanic climate modes.We subsequently revise the O_(2)-based carbon uptakes in response to this changing air-sea O_(2)flux.Our results show that,for the 1990−2000 period,the averaged net ocean and land sinks are 2.10±0.43 and 1.14±0.52 GtC yr−1 respectively,overall consistent with estimates derived by the Global Carbon Project(GCP).An enhanced carbon uptake is found in both land and ocean after year 2000,reflecting the modification of carbon cycle under human activities.Results derived from CMIP5 simulations also investigated in the study allow for comparisons from which we can see the vital importance of oxygen dataset on carbon uptake estimations.

关 键 词：air-sea O_(2)flux carbon budget land and ocean carbon sinks CMIP6 

分 类 号：P467[天文地球—大气科学及气象学] P734