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여름철 동남극 테라노바 만의 순환 변동과 난센 빙붕 기저 용융의 특성

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Abstract
Ice shelf basal melting, caused by seawater intrusion and a consequence of ocean-ice
shelf interaction, is a significant process that occupies over half of Antarctic ice mass loss.
However, It is difficult to evaluate the properties of the ocean in the ice shelf cavity due to
restrictive spatiotemporal observation beneath the ice shelf. Terra Nova Bay (TNB) in
western Ross Sea, where high-salinity shelf water (HSSW) is formed by polynya activity,
has seasonal water mass variations. Nansen Ice Shelf (NIS) near the TNB is a cold-cavity ice
shelf with seasonal variations of basal melting influenced by water mass. Previous studies
suggested that eddies are vital in heat transport and would support enhanced basal melting in
summertime by pushing seawater into the cavity. This study presents the relationship
between summertime fluctuations about local circulation and basal melting using 3-
dimensional high resolution numerical model with considering ocean-ice interaction.
Simulated sea conditions and eddies are analogous to hydrographic data from the same
period.
The result implies that mesoscale perturbations in TNB dominate regional circulation and
lead to NIS basal melting variability by shifting the warm surface water inflow direction.
Empirical orthogonal function (EOF) analysis for sea surface height presents mesoscale
eddies and the intensity of seasonal mean current. High basal melt arises partially at the
western NIS front when cyclonic (clockwise) eddy exists forward the NIS. On the other hand,
high basal melt arises at the eastern NIS front when anticyclonic (anticlockwise) eddy exists.
Eddies in front of the NIS play a role in adjusting the direction of warm surface water into
the cavity. The surface mean current is shifted southward (northward) by cyclonic
(anticyclonic) eddy; thus, higher basal melt rates are present intensively at the western
(eastern) NIS front. Moreover, vertical distribution of heat advection shows that warm
surface water intrudes deeper into the cavity in presence of eddies. This study suggests that
the variability of seasonal mean current induced by mesoscale eddies affects surface inflows
into the cavity, enhancing local basal melting. Furthermore, spatial variation for NIS melt
rates implies the possibility for NIS calving event transpired in April 2016.
Author(s)
이진호
Issued Date
2024
Awarded Date
2024-02
Type
Dissertation
URI
https://dcoll.jejunu.ac.kr/common/orgView/000000011847
Alternative Author(s)
Lee Jinho
Affiliation
제주대학교 대학원
Department
대학원 지구해양융합학부
Advisor
문재홍
Table Of Contents
1. 서론 1
2. 자료 및 연구 방법 4
2.1 연구 지역 4
2.2 수치모델 9
2.3 자료 분석 16
3. 결과 19
3.1 모델 검증 19
3.2 TNB의 순환 변동 29
3.3 NIS의 기저 용융 변동 34
3.4 순환 변동과 기저 용융 변동의 관계 32
4. 결론 및 토의 51
참고문헌 55
Degree
Master
Publisher
제주대학교 대학원
Citation
이진호. (2024). 여름철 동남극 테라노바 만의 순환 변동과 난센 빙붕 기저 용융의 특성.
Appears in Collections:
Faculty of Earth and Marine Convergence > Earth and Marine Science
Faculty of Earth and Marine Convergence > Ocean System
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