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Ice front retreat reconfigures meltwater-driven gyres modulating ocean heat delivery to an Antarctic ice shelf

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Title
Ice front retreat reconfigures meltwater-driven gyres modulating ocean heat delivery to an Antarctic ice shelf
Other Titles
남극 빙하말단부 후퇴에 의한 용융수 유출에 의해 생성된 환류의 열수송 조절
Authors
Yoon, Seung-Tae
Lee, Won Sang
Nam, SungHyun
Lee, Choon-Ki
Yun, Sukyoung
Heywood, Karen
Boehme, Lars
Zheng, Yixi
Lee, Inhee
Choi, Yeon
Jenkins, Adrian
Jin, Emilia Kyung
Larter, Robert
Wellner, Julia
Dutrieux, Pierre
Bradley, Alexander T.
Subject
Science & Technology - Other Topics
Keywords
PINE ISLAND GLACIERSEA CONTINENTAL-SHELFOCEANOGRAPHIC CONTROLSTHWAITES GLACIERCIRCULATIONVARIABILITYSHEETSTABILITYIMPACTWATER
Issue Date
2022-01-13
Citation
Yoon, Seung-Tae, et al. 2022. "Ice front retreat reconfigures meltwater-driven gyres modulating ocean heat delivery to an Antarctic ice shelf". NATURE COMMUNICATIONS, 13(1): 1-8.
Abstract
Glacial melt can modify heat transport, and therefore ocean processes, associated with ice front retreat, as revealed by direct observations from the Pine Island Bay region of Antarctica. Pine Island Ice Shelf (PIIS) buttresses the Pine Island Glacier, the key contributor to sea-level rise. PIIS has thinned owing to ocean-driven melting, and its calving front has retreated, leading to buttressing loss. PIIS melting depends primarily on the thermocline variability in its front. Furthermore, local ocean circulation shifts adjust heat transport within Pine Island Bay (PIB), yet oceanic processes underlying the ice front retreat remain unclear. Here, we report a PIB double-gyre that moves with the PIIS calving front and hypothesise that it controls ocean heat input towards PIIS. Glacial melt generates cyclonic and anticyclonic gyres near and off PIIS, and meltwater outflows converge into the anticyclonic gyre with a deep-convex-downward thermocline. The double-gyre migrated eastward as the calving front retreated, placing the anticyclonic gyre over a shallow seafloor ridge, reducing the ocean heat input towards PIIS. Reconfigurations of meltwater-driven gyres associated with moving ice boundaries might be crucial in modulating ocean heat delivery to glacial ice.
URI
https://repository.kopri.re.kr/handle/201206/13264
DOI
http://dx.doi.org/10.1038/s41467-022-27968-8
Type
Article
Station
Araon
Indexed
SCIE
Appears in Collections  
2021-2022, Land-Ice/Ocean Network Exploration with Semiautonomous Systems: Thwaites Glacier (LIONESS/TG) - Toward understanding the fate of the Thwaites Glacier by abrupt collapse and its impact on global sea level changes - (21-22) / Lee, Won Sang (PM21020)
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