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Sinking particle flux and composition at three sites of different annual sea ice cover in the Amundsen Sea, Antarctica

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Cited 1 time in scopus
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Title
Sinking particle flux and composition at three sites of different annual sea ice cover in the Amundsen Sea, Antarctica
Other Titles
남극 아문젠해 연간 해빙분포가 다른 세 개 정점에서의 침강입자 플럭스 및 조성
Authors
김민경
Yang, Eun Jin
김동선
정진현
김형직
Park, Jisoo
Jung, Jinyoung
Hugh W. Ducklow
Lee, Sang H.
황점식
Keywords
Amundsen Sea; Biological pump; Particulate organic carbon; Perennial ice-covered area; Polynya
Issue Date
2019
Citation
김민경, et al. 2019. "Sinking particle flux and composition at three sites of different annual sea ice cover in the Amundsen Sea, Antarctica". JOURNAL OF MARINE SYSTEMS, 192(1): 42-50.
Abstract
This study examines the sinking particle flux and composition of samples collected at three sites in the western Amundsen Sea, Antarctica: a perrennial sea-ice-covered area, the central region of the Amundsen Sea polynya, and close to the Dotson Ice Shelf within the polynya. Time series sediment traps were deployed for one year at depths of 400-500 m from February and March 2012. Observations from the three sites confirm previously reported findings that the majority of annual POC (particulate organic carbon) flux in the Amundsen Sea occurs during the austral summer, with much smaller POC fluxes during other seasons. In the perennial ice-covered area, sea ice diatoms were the dominant source of sinking particles. In the region, the summertime POC flux is similar to that in the central polynya. However, the POC flux exhibited large interannual variability, with the reduction in sea ice cover and sufficient insolation being critical to enhanced sinking POC flux. Within the Amundsen Sea polynya, the sinking POC flux was higher in the central region than near the Dotson Ice Shelf, consistent with spatial variability in primary production. The site near the Dotson Ice Shelf had the lowest contribution of diatoms to sinking particles and the smallest POC flux among the three sites.
URI
http://repository.kopri.re.kr/handle/201206/10047
DOI
http://dx.doi.org/10.1016/j.jmarsys.2019.01.002
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