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2022 Vol.44, Issue 4 Preview Page

Article

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 Kim1
,
Emilia Kyung Jin2
,
Ji Sung Na2
,
Choon Ki Lee2
,
Won Sang Lee2
,
Jae-Hong Moon1*
김 태균1
,
진 경2
,
나 지성2
,
이 춘기2
,
이 원상2
,
문 재홍1*
1Department of Earth and Marine Science, College of Ocean Sciences, Jeju National University, Jeju 63243, Korea
2Division of Glacial Environment Research, Korea Polar Research Institute, Incheon 21990, Korea
1제주대학교 해양과학대학 지구해양과학과 (63243) 제주특별자치도 제주시 제주대학로 102
2극지연구소 빙하환경연구본부 (21990) 인천광역시 연수구 송도미래로 262
*Corresponding Author
30 December 2022. pp. 269-285
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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
ocean-ice shelf interaction
cavity circulation
basal melt rate
numerical simulation
antarctica
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Information
  • Publisher :Korea Institute of Ocean Science and Technology
  • Publisher(Ko) :한국해양과학기술원
  • Journal Title :Ocean and Polar Research
  • Journal Title(Ko) :Ocean and Polar Research
  • Volume : 44
  • No :4
  • Pages :269-285
  • Received Date : 2022-07-29
  • Revised Date : 2022-11-16
  • Accepted Date : 2022-11-25
  • DOI :https://doi.org/10.4217/OPR.2022027
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