Impact of transparent exopolymer particles on the dynamics of dissolved organic carbon in the Amundsen Sea,AntarcticaOA北大核心
Impact of transparent exopolymer particles on the dynamics of dissolved organic carbon in the Amundsen Sea,Antarctica
The Southern Ocean is an important carbon sink pool and plays a critical role in the global carbon cycling.The Amundsen Sea was reported to be highly productive in inshore area in the Southern Ocean.In order to investigate the influence of transparent exopolymer particles(TEP)on the behavior of dissolved organic carbon(DOC)in this region,a comprehensive study was conducted,encompassing both open water areas and highly productive polynyas.It was found that microbial heterotrophic metabolism is the primary process responsible for the production of humic-like fluorescent components in the open ocean.The relationship between apparent oxygen utilization and the two humic-like components can be accurately described by a power-law function,with a conversion rate consistent with that observed globally.The presence of TEP was found to have little impact on this process.Additionally,the study revealed the accumulation of DOC at the sea surface in the Amundsen Sea Polynya,suggesting that TEP may play a critical role in this phenomenon.These findings contribute to a deeper understanding of the dynamics and surface accumulation of DOC in the Amundsen Sea Polynya,and provide valuable insights into the carbon cycle in this region.
HU Ji;XUE Siyou;ZHAO Jun;LI Dong;ZHANG Haifeng;YU Peisong;ZHANG Cai;YANG Xufeng;PAN Jianming
Key Laboratory of Marine Ecosystem Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,ChinaKey Laboratory of Marine Ecosystem Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China||College of Ocean and Earth Sciences,Xiamen University,Xiamen 361102,China
dissolved organic matterchromophoric dissolved organic matterexcitation-emission matrix coupled with parallel factor analysistransparent exopolymer particlesAmundsen SeaAntarctica
《极地科学进展（英文版）》 2024 (001)
123-131 / 9
The authors thank the Polar Research Institute of China and the crew of R/V Xuelong for their assistance in sample collection and analysis on board.This research was funded by the National Natural Science Foundation of China(Grant nos.42276255 and 41976227),and project"Impact and Response of Antarctic Seas to Climate Change,IRASCC 2020-2022"(Grant nos.01-01-02A and 02-02-05).We appreciate two anonymous reviewers and Associate Editor Dr.Liyang Zhan for constructive comments that helped us improve the manuscript.
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