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Relationship between development of the Terra Nova Bay Polynya and distributions of water masses during the austral summer seasons in 2014-2016

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Title
Relationship between development of the Terra Nova Bay Polynya and distributions of water masses during the austral summer seasons in 2014-2016
Other Titles
2014-2016 하계 관측에서 확인된 수괴 분포와 테라노바만 폴리냐 발달간의 연관성 분석
Authors
Yoon, Seung-Tae
Lee, Won Sang
Stevens, Craig
Zappa, Christopher J.
Yun, Sukyoung
Hwang, Chung Yeon
Jang, Gwang Il
Lee, Jiyeon
Nam, SungHyun
Keywords
PolynyaTerra Nova BayWater Mass
Issue Date
2018
Citation
Yoon, Seung-Tae, et al. 2018. Relationship between development of the Terra Nova Bay Polynya and distributions of water masses during the austral summer seasons in 2014-2016. Asia Oceania Geosciences Society annual meeting 2018. Hawaii Convention Center (Honolulu). 2018.06.04~2018.06.08.
Abstract
Antarctic Bottom Water (AABW) is largely formed in the Weddell and Ross Seas and is considered a pivotal component for ventilation of the deeper ocean. It is known that the Terra Nova Bay (TNB) polynya, a latent heat polynya, plays an important role in the formation of High Salinity Shelf Water (HSSW), which is a source water for AABW. However, it remains partly understood how the development of the TNB polynya determines thermohaline structures in the TNB. In this presentation, we investigate the relation between TNB polynya activity and distributions of water masses using CTD, LADCP, and mooring data observed in the TNB during the austral summer seasons in 20142016. The open area of the TNB polynya expanded over the period. This is likely associated with an increasing number of katabatic events (continuous westerly wind) which increased from 109 to 149 in the austral winter months. This resulted in the salinity of deep water masses for the austral summer in 2016 being larger than that in 2014 (2015) by 0.03 (0.02). Active brine rejection due to strong wind and widened polynya could be responsible for this. In addition, more frequent katabatic events for the winter months in 2016 make stronger wind-induced cyclonic circulation (~10 cm/s) in the TNB, in turn Modified Shelf Water, a precursor of AABW, is clearly detected. We hypothesize that a wide-open TNB polynya triggers faster transportation of HSSW to AABW, and we will discuss further features of wide/narrow TNB polynya and their impacts on thermohaline structures in the TNB.
URI
https://repository.kopri.re.kr/handle/201206/12597
Conference Name
Asia Oceania Geosciences Society annual meeting 2018
Conference Place
Hawaii Convention Center (Honolulu)
Conference Date
2018.06.04~2018.06.08
Type
Proceeding
Indexed
Pro(초록)국외
Appears in Collections  
2018-2019, Investigating Cryospheric Evolution of the Victoria Land, Antarctica -ICE- (18-19) / Lee, Won Sang (PM18020)
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