Sinking particle flux in the sea ice zone of the Amundsen Shelf, Antarctica SCIE SCOPUS

Cited 18 time in WEB OF SCIENCE Cited 21 time in Scopus
Title
Sinking particle flux in the sea ice zone of the Amundsen Shelf, Antarctica
Author(s)
Kim, Minkyoung; Hwang, Jeomshik; Kim, Hyung J.; Kim, Dongseon; Yang, Eun J.; Ducklow, Hugh W.; La, Hyoung S.; Lee, Sang H.; Park, Jisoo; Lee, SangHoon
KIOST Author(s)
Kim, Hyung Jeek(김형직)Kim, Dongseon(김동선)
Publication Year
2015-07
Abstract
We have examined the flux, biogenic composition, and isotopic values of sinking particles collected by a time-series sediment trap deployed in the sea ice zone (SIZ) of the Amundsen Sea from January 2011 for 1 year, The major portion of the particle flux occurred during the austral summer in January and February when sea ice concentration was reduced to <60%. Biogenic components, dominated by opal (similar to 78% of the biogenic components), accounted for over 75% of particle flux during this high-flux period. The dominant source of sinking particles shifted from diatoms to soft-tissued organisms, evidenced by high particulate organic carbon (POC) content (> 30%) and a low bio-Si/POC ratio (< 0.5) during the austral winter. CaCO3 content and its contribution to total particle flux was low (similar to 6%) throughout the study period. Aged POC likely supplied from sediment resuspension accounted for a considerable fraction only from October to December, which was evidenced by a low radiocarbon content and relatively high (30-50%) content of the non-biogenic components. When compared with POC flux inside the Amundsen Sea polynya obtained by the US Amundsen Sea Polynya International Research Expedition (ASPIRE), the POC flux integrated over the austral summer in the SIZ was virtually identical, although the maximum POC flux was approximately half that inside the Amundsen Sea polynya. This comparatively high POC flux integrated over the austral summer in the SIZ may be caused by phytoplankton blooms persisting over a longer periods and more efficient export of organic matter potentially owing to the diatom-dominant plankton community. If this observation is a general phenomenon on the Amundsen Shelf, the role of the SIZ, compared with the polynyas, need to be examined more carefully when trying to characterize the POC export in this region. (C) 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
ISSN
0967-0637
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2451
DOI
10.1016/j.dsr.2015.04.002
Bibliographic Citation
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, v.101, pp.110 - 117, 2015
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Subject
ROSS SEA; PHYTOPLANKTON BLOOMS; ORGANIC-CARBON; DEEP-WATER; POLYNYA; CIRCULATION; EXPORT
Keywords
Particulate organic carbon; Particle flux; Sea ice zone; Sediment trap; Amundsen Sea; Radiocarbon
Type
Article
Language
English
Document Type
Article
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Related Researcher
Research Interests

Particle flux,Carbon cycle,Climate Change,입자 플럭스,탄소순환,기후변화

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