Storage and redistribution of anthropogenic CO2 in the western North Pacific:The role of subtropical mode water transportation

Cheng-long Li ¹Lei Han ²Wei-dong Zhai ³Di Qi ⁴Xu-chen Wang ⁵Hong-mei Lin ¹Li-wen Zheng⁶

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作者信息

1. Institute of Marine Science and Technology,Shandong University,Qingdao 266237,China
2. China-ASEAN College of Marine Science and Technology,Xiamen University Malaysia,Selangor,Malaysia
3. Institute of Marine Science and Technology,Shandong University,Qingdao 266237,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519080,China
4. Polar and Marine Research Institute,Jimei University,Xiamen 361021,China
5. Key Laboratory of Marine Chemistry Theory and Technology,and Frontiers Science Center for Deep Ocean Multispheres and Earth System,Ministry of Education,Ocean University of China,Qingdao 266100,China;Center for Isotope Geochemistry and Geochronology,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China
6. Weihai Institute of Marine Ecology and Economy Research,Weihai 264400,China
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Abstract

Oceanic uptake and storage of anthropogenic CO2(CANT)are regulated by ocean circulation and ventilation.To decipher the storage and redistribution of CANT in the western North Pacific,where a major CANT sink develops,we investigated the water column carbonate system,dissolved inorganic radiocarbon and ancillary parameters in May and August 2018,spanning the Kuroshio Extension(KE,35-39 °N),Kuroshio Recirculation(KR,27-35 °N)and subtropical(21-27 °N)zones.Water column CANT inventories were estimated to be 40.5±1.1 mol m-2 in the KR zone and 37.2±0.9 mol m-2 in the subtropical zone.In comparison with historical data obtained in 2005,relatively high rates of increase of the CANT inventory of 1.05±0.20 and 1.03±0.12 mol m-2 yr-1 in the recent decade were obtained in the KR and subtropical zones,respectively.Our water-mass-based analyses suggest that formation and transport of subtropical mode water dominate the deep penetration,storage,and redistribution of CANT in those two regions.In the KE zone,however,both the water column CANT inventory and the decadal CANT accumulation rate were small and uncertain owing to the dynamic hydrology,where the naturally uplifting isopycnal surfaces make CANT penetration relatively shallow.The findings of this study improve the understanding of the spatiotemporal variations of CANT distribution,storage,and transport in the western North Pacific.

Key words

Oceanic CO2 uptake/Anthropogenic CO2 storage/Subtropical mode water/Kuroshio extension/Kuroshio recirculation/Western North Pacific

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基金项目

国家自然科学基金(42141001)

国家自然科学基金(91858210)

Laboratory of Marine Isotopic Technology and Environmental Risk Assessment,Third Institute of Oceanography,Ministry of Natur()

Survey Project of Environmental Radioactivity Detection in the Western Pacific(R/V Xiangyanghong 3)

Survey Project of Environmental Radioactivity Detection in the Western Pacific(R/V Tan Kah Kee)

出版年

2024

自然科学基础研究(英文)

CSTPCD

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参考文献量67

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