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Interannual Variation of Modified Circumpolar Deep Water in the Dotson-Getz Trough, West Antarctica

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Cited 1 time in scopus
Title
Interannual Variation of Modified Circumpolar Deep Water in the Dotson-Getz Trough, West Antarctica
Other Titles
서남극 닷슨-겟츠 골 에서 환남극 심층수의 연간변동
Authors
Kim, Tae-Wan
Yang, Heewon
Dutrieux, Pierre
Wahlin, Anna K.
Jenkins, Adrian
Kim, Yeong Gi
Ha, Ho Kyung
Kim, Chang-Sin
Cho, Kyoung-Ho
Park, Taewook
Park, Jisoo
Lee, SangHoon
Cho, Yang-Ki
Subject
Oceanography
Keywords
Ekman upwellingAmundsen SeaDotson Ice ShelfDotson-Getz Troughhydrographic data
Issue Date
2021-12
Citation
Kim, Tae-Wan, et al. 2021. "Interannual Variation of Modified Circumpolar Deep Water in the Dotson-Getz Trough, West Antarctica". JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 126(12): 1-25.
Abstract
Widespread ice shelf thinning has been recorded in the Amundsen Sea in recent decades, driven by basal melting and intrusions of relatively warm Circumpolar Deep Water (CDW) onto the continental shelf. The Dotson Ice Shelf (DIS) is located to the south of the Amundsen Sea polynya, and has a high basal melting rate because modified CDW (mCDW) fills the Dotson-Getz Trough (DGT) and reaches the base of the ice shelf. Here, hydrographic data in the DGT obtained during seven oceanographic surveys from 2007 to 2018 were used to study the interannual variation in mCDW volume and properties and their causes. Although mCDW volume showed relatively weak interannual variations at the continental shelf break, these variations intensified southward and reached a maximum in front of the DIS. There, the mCDW volume was similar to 8,000 km(3) in 2007, rapidly decreased to 4,700 km(3) in 2014 before rebounding to 7,300 km(3) in 2018. We find that such interannual variability is coherent with local Ekman pumping integrated along the DGT modulated by the presence of sea ice, and complementing earlier theories involving shelf break winds only. The interannual variability in strength of the dominant south-southeast coastal wind modulates the amplitude of Ekman upwelling along the eastern boundary of the Amundsen Sea polynya during the austral summers of the surveyed years, apparently leading to change in the volume of mCDW along the DGT. We note a strong correlation between the wind variability and the longitudinal location of the Amundsen Sea Low.
URI
https://repository.kopri.re.kr/handle/201206/13325
DOI
http://dx.doi.org/10.1029/2021JC017491
Type
Article
Station
Araon
Indexed
SCIE
Appears in Collections  
2021-2021, Carbon cycle change and ecosystem response under the Southern Ocean warming (21-21) / Park, Jisoo (PE21110)
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