Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Numerical Simulation of Ocean - Ice Shelf Interaction: Water Mass Circulation in the Terra Nova Bay, Antarctica

해양-빙붕 상호작용을 고려한 남극 테라노바 만에서 수괴 형성과 순환의 수치 시뮬레이션

  • Taekyun, Kim (Department of Earth and Marine Science, College of Ocean Sciences, Jeju National University) ;
  • Emilia Kyung, Jin (Division of Glacial Environment Research, Korea Polar Research Institute) ;
  • Ji Sung, Na (Division of Glacial Environment Research, Korea Polar Research Institute) ;
  • Choon Ki, Lee (Division of Glacial Environment Research, Korea Polar Research Institute) ;
  • Won Sang, Lee (Division of Glacial Environment Research, Korea Polar Research Institute) ;
  • Jae-Hong, Moon (Department of Earth and Marine Science, College of Ocean Sciences, Jeju National University)
  • 김태균 (제주대학교 해양과학대학 지구해양과학과) ;
  • 진경 (극지연구소 빙하환경연구본부) ;
  • 나지성 (극지연구소 빙하환경연구본부) ;
  • 이춘기 (극지연구소 빙하환경연구본부) ;
  • 이원상 (극지연구소 빙하환경연구본부) ;
  • 문재홍 (제주대학교 해양과학대학 지구해양과학과)
  • Received : 2022.07.29
  • Accepted : 2022.11.25
  • Published : 2022.12.30
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Abstract

The interaction between ocean and ice shelf is a critical physical process in relation to water mass transformations and ice shelf melting/freezing at the ocean-ice interface. However, it remains challenging to thoroughly understand the process due to a lack of observational data with respect to ice shelf cavities. This is the first study to simulate the variability and circulation of water mass both overlying the continental shelf and underneath an ice shelf and an ice tongue in the Terra Nova Bay (TNB), East Antarctica. To explore the properties of water mass and circulation patterns in the TNB and the corresponding effects on sub ice shelf basal melting, we explicitly incorporate the dynamic-thermodynamic processes acting on the ice shelf in the Regional Ocean Modeling System. The simulated water mass formation and circulation in the TNB region agree well with previous studies. The model results show that the TNB circulation is dominated by the geostrophic currents driven by lateral density gradients induced by the releasing of brine or freshwater at the polynya of the TNB. Meanwhile, the circulation dynamics in the cavity under the Nansen Ice shelf (NIS) are different from those in the TNB. The gravity-driven bottom current induced by High Salinity Shelf Water (HSSW) formed at the TNB polynya flows towards the grounding line, and the buoyance-driven flow associated with glacial meltwater generated by the HSSW emerges from the cavity along the ice base. Both current systems compose the thermohaline overturning circulation in the NIS cavity. This study estimates the NIS basal melting rate to be 0.98 m/a, which is comparable to the previously observed melt rate. However, the melting rate shows a significant variation in space and time.

Keywords

Acknowledgement

이 논문은 2022년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업(NRF-2020R1I1A1A01053137)과 2021년도 교육부의 재원으로 한국연구재단의 지원을 받아 수행된 이공분야기초연구 사업(NRF-2021R1I1A2050261)의 결과입니다. 또한, 이 논문은 2022년도 해양수산부 재원으로 해양수산과학기술진흥원의 지원을 받아 수행된 연구입니다(20190316, 극지 및 대양과학 연구사업).

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