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The Southern Ocean carbon sink has been overestimated in the past three decades

文献类型：期刊论文

作者Zhong, Guorong1,2,3,4; Li, Xuegang1,2,3,4; Song, Jinming1,2,3,4; Wang, Fan1,2,4; Qu, Baoxiao1,2,4; Wang, Yanjun2,4; Zhang, Bin2,4; Ma, Jun1,2,4; Yuan, Huamao1,2,3,4; Duan, Liqin1,2,3,4
刊名COMMUNICATIONS EARTH & ENVIRONMENT
出版日期2024-07-24
卷号5期号:1页码:12
DOI10.1038/s43247-024-01566-6
通讯作者Li, Xuegang(lixuegang@qdio.ac.cn) ; Song, Jinming(jmsong@qdio.ac.cn)
英文摘要Employing machine learning methods for mapping surface ocean pCO2 has reduced the uncertainty in estimating sea-air CO2 flux. However, a general discrepancy exists between the Southern Ocean carbon sinks derived from pCO2 products and those from biogeochemistry models. Here, by performing a boosting ensemble learning feed-forward neural networks method, we have identified an underestimation of the surface Southern Ocean pCO2 due to notably uneven density of pCO2 measurements between summer and winter, which resulted in about 16% overestimating of Southern Ocean carbon sink over the past three decades. In particular, the Southern Ocean carbon sink since 2010 was notably overestimated by approximately 29%. This overestimation can be mitigated by a winter correction in algorithms, with the average Southern Ocean carbon sink during 1992-2021 corrected to -0.87 PgC yr-1 from the original -1.01 PgC yr-1. Furthermore, the most notable underestimation of surface ocean pCO2 mainly occurred in regions south of 60 degrees S and was hiding under ice cover. As the surface ocean pCO2 under sea ice coverage in the winter is much higher than the atmosphere, if sea ice melts completely, there could be a further reduction of about 0.14 PgC yr-1 in the Southern Ocean carbon sink. Surface partial pressure of carbon dioxide in the Southern Ocean has been underestimated, in particular beneath sea ice, because of uneven observational density in winter and summer, suggesting that the carbon sink may weaken further in the future, according to analyses of in-situ observations with a neural-network-based method.
WOS关键词GRIDDED DATA ; CO2 ; SEA ; PCO(2) ; VARIABILITY ; CLIMATOLOGY ; EXCHANGE ; RECONSTRUCTION ; SEAWATER ; COASTAL
资助项目the National Natural Science Foundation of China (grant nos.42176200), Laoshan Laboratory (LSKJ202204001, LSKJ202205001),National Key Research and Development Program (2022YFC3104305)[42176200] ; the National Natural Science Foundation of China (grant nos.42176200), Laoshan Laboratory (LSKJ202204001, LSKJ202205001),National Key Research and Development Program (2022YFC3104305)[LSKJ202204001] ; the National Natural Science Foundation of China (grant nos.42176200), Laoshan Laboratory (LSKJ202204001, LSKJ202205001),National Key Research and Development Program (2022YFC3104305)[LSKJ202205001] ; National Natural Science Foundation of China[2022YFC3104305] ; National Key Research and Development Program ; Yantai City Talent Programs ; Public Technical Service Center, Institute of Oceanology, Chinese Academy of Sciences ; International Ocean Carbon Coordination Project (IOCCP) ; Surface Ocean Lower Atmosphere Study (SOLAS) ; Integrated Marine Biosphere Research (IMBeR) program
WOS研究方向Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences
语种英语
WOS记录号WOS:001274912000001
出版者SPRINGERNATURE
源URL[http://ir.qdio.ac.cn/handle/337002/186078]  
专题中国科学院海洋研究所
通讯作者Li, Xuegang; Song, Jinming
作者单位1.Laoshan Lab, Qingdao, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
4.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China
推荐引用方式
GB/T 7714		 Zhong, Guorong,Li, Xuegang,Song, Jinming,et al. The Southern Ocean carbon sink has been overestimated in the past three decades[J]. COMMUNICATIONS EARTH & ENVIRONMENT,2024,5(1):12.
APA Zhong, Guorong.,Li, Xuegang.,Song, Jinming.,Wang, Fan.,Qu, Baoxiao.,...&Dai, Jiajia.(2024).The Southern Ocean carbon sink has been overestimated in the past three decades.COMMUNICATIONS EARTH & ENVIRONMENT,5(1),12.
MLA Zhong, Guorong,et al."The Southern Ocean carbon sink has been overestimated in the past three decades".COMMUNICATIONS EARTH & ENVIRONMENT 5.1(2024):12.

入库方式： OAI收割

来源：海洋研究所

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