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Investigation of recent oceanic contributions to instability of the Thwaites and Pine Island Glaciers

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Title
Investigation of recent oceanic contributions to instability of the Thwaites and Pine Island Glaciers
Other Titles
스웨이츠와 파인아일랜드 빙붕의 불안정도에 기여하는 해양 강제력의 최근 변화 연구
Authors
Yoon, Seung-Tae
Lee, Won Sang
Nam, SungHyun
Yun, Sukyoung
Choi, Yeon
Kim, Hyung-Bo
Keywords
Circumpolar Deep WaterPine Island Bay gyrePine Island GlacierThwaties Glacier
Issue Date
2020
Citation
Yoon, Seung-Tae, et al. 2020. Investigation of recent oceanic contributions to instability of the Thwaites and Pine Island Glaciers. Forum for Research into Ice Shelf Processes (FRISP) - Virtual conference 2020. ZOOM Meeting. 2020.06.16~2020.06.25.
Abstract
The Antarctic ice shelves around the Amundsen Sea has experienced the fastest melting together with the rapid grounding line retreat in recent decades driven by the incursion of relatively warm Circumpolar Deep Water (CDW) into the sub-ice shelves. The Thwaites and Pine Island Glaciers have had attentions due to the most apparent thinning among the western Antarctic ice shelves. The Antarctic survey was done in the Pine Island Bay from January 29 to February 15, 2020 aboard the ice-breaking research vessel ARAON to evaluate recent oceanic contributions to instability of the Thwaites and Pine Island Glaciers. Through this survey, in-situ data from 89 full-depth CTD/LADCP profiling were collected near and off the ice shelves where we considered small basins, ridges, and troughs found based on high-resolution bathymetry data along with sea ice distributions. In this presentation, we propose three key findings: 1) CDW pathways below 700 m and heat transport into the two sub-ice shelves are primarily controlled by bed topography; 2) Horizontal ocean circulation in the Pine Island Bay plays an important role in distributing and redistributing heat within the bay and into the ice shelves that is changed due to the Pine Island Glacier ice front retreat. 3) The glacial meltwater flowing out from the two glaciers shape spatial and temporal variability of meltwater fraction at the upper (shallower than 500 m) ocean near and off the ice shelves. We discuss the observational results from 2020 survey in the context of the decadal variability.
URI
https://repository.kopri.re.kr/handle/201206/12426
Conference Name
Forum for Research into Ice Shelf Processes (FRISP) - Virtual conference 2020
Conference Place
ZOOM Meeting
Conference Date
2020.06.16~2020.06.25
Type
Proceeding
Indexed
세미나-학술발표
Appears in Collections  
2019-2020, 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 - (19-20) / Lee, Won Sang (PM19020)
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