Impact of transparent exopolymer particles on the dynamics of dissolved organic carbon in the Amundsen Sea, Antarctica

Hu, Ji and Xue, Siyou and Zhao, Jun and Li, Dong and Zhang, Haifeng and Yu, Peisong and Zhang, Cai and Yang, Xufeng and Pan, Jianming (2024) Impact of transparent exopolymer particles on the dynamics of dissolved organic carbon in the Amundsen Sea, Antarctica. Advances in Polar Science, 35 (1). pp. 123-131.

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Abstract

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.

Item Type:	Article
Related URLs:
Keywords:	dissolved organic matter, chromophoric dissolved organic matter, excitation-emission matrix coupled with parallel factor analysis, transparent exopolymer particles, Amundsen Sea, Antarctica
Subjects:	Natural Environment > Oceans
Organizations:	Unspecified
Date Deposited:	03 Jan 2025 14:58
URI:	http://library.arcticportal.org/id/eprint/2842

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