Distributions of dissolved oxygen and apparent oxygen utilization in the Cosmonaut Sea and Amundsen Sea in austral summer 2022OA
Distributions of dissolved oxygen and apparent oxygen utilization in the Cosmonaut Sea and Amundsen Sea in austral summer 2022
Dissolved oxygen(DO)and apparent oxygen utilization(AOU)are essential parameters for evaluating the impact of climate change on marine ecosystems.In this study,we utilized data on DO and AOU collected from the Amundsen Sea(western Antarctic)and the Cosmonaut Sea(eastern Antarctic)during the 38th Chinese National Antarctic Research Expedition,along with chlorophyll a(Chl a)data,to analyze the impact of primary production and the spatial distribution and structural features of water masses in these regions.The findings show that the standard deviation range of parallel DO samples is between 0.1 and 3.9 μmol·L-1,meeting the precision criteria of the survey method.AOU values lower than 0.0 μmol·L-1 were commonly observed in the surface waters of both regions,with the highest incidence in the polynya of Amundsen Sea,indicating a strong influence of high primary production.The Cosmonaut Sea exhibited the highest AOU values(higher than 160.0 μmol·L-1)in the 75-500 m layer,while AOU value in the Amundsen Sea did not exceed 160.0 μmol·L-1,suggesting potential upwelling of Circumpolar Deep Water to 100 m in the Cosmonaut Sea with minimal changes in its properties,whereas significant changes were noted in the properties of upwelling modified Circumpolar Deep Water in the Amundsen Sea.AOU values lower than 125.0 μmol·L-1 were detected in the near-bottom waters of the Cosmonaut Sea,indicating the presence of Antarctic Bottom Water.
DING Yufei;ZHU Changfeng;ZHANG Cai;ZHANG Haifeng;ZHAO Jun;GUO Xiaoze;ZHANG Wei;PAN Jianming
Key Laboratory of Marine Ecosystem Dynamics,Ministry of Natural Resources,Hangzhou 310012,China||Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,ChinaOrganic Geochemistry Unit,Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province,School of Earth Sciences,Zhejiang University,Hangzhou 310027,China
dissolved oxygenapparent oxygen utilizationSouthern Oceanwater masschlorophyll a
《极地科学进展（英文版）》 2024 (003)
327-369 / 43
The authors wish to thank the CHINARE-38 team members and the crew of R/V Xuelong and R/V Xuelong 2 for helping collect water samples and temperature and salinity data.Special thanks are extended to researchers He Shichang and Zhang Naixing for their contributions to the collection and determination of dissolved oxygen in the Amundsen Sea.The study was financially supported by the Scientific Research Fund of the Second Institute of Oceanography,MNR(Grant nos.JG2211 and JG2212),the National Polar Special Program"Impact and Response of Antarctic Seas to Climate Change"(Grant nos.IRASCC 01-01-02A and IRASCC 02-02),the National Key Research and Development Program of China(Grant no.2022YFE0136500)and the National Natural Science Foundation of China(Grant no.41976228).We would like to thank the anonymous reviewers and Associate Editor Dr.Zhan Liyang for their helpful remarks.
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