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Observations of Ocean Transport and Mixing Across Scales in the Subpolar North Atlantic and Greenland
Observations of Ocean Transport and Mixing Across Scales in the Subpolar North Atlantic and Greenland
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103539
- ISBN
- 9798291558232
- DDC
- 551.46
- 저자명
- Nelson, Monica.
- 서명/저자
- Observations of Ocean Transport and Mixing Across Scales in the Subpolar North Atlantic and Greenland
- 발행사항
- [Sl] : University of California, San Diego, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 138 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-02, Section: A.
- 주기사항
- Advisor: Purkey, Sarah;Straneo, Fiammetta.
- 학위논문주기
- Thesis (Ph.D.)--University of California, San Diego, 2025.
- 초록/해제
- 요약Ocean dynamics in the subpolar North Atlantic play an important role in the global climate system: Deep convection in the open ocean drives a large-scale overturning circulation that redistributes heat around the globe and cold currents circulating around Greenland protect marine-terminating glaciers from warmer water offshore that drives ice-melt and sea level rise. However, the drivers of natural variability within this complex system, and how the region will respond to anthropogenic forcing, are not fully understood. This thesis sheds light on two regions of the subpolar North Atlantic: the Irminger Sea and the Greenland continental shelf, where the mesoscale dynamics that deliver heat to these otherwise cold regions are studied.The Irminger Sea is a region of deep convection, contributing to the water mass transformation and large-scale circulation. In Chapter 1, observations from profiling Argo floats and repeat hydrography are used to track buoyancy changes in the Irminger interior and study the region's recovery from wintertime convection. This work shows that the slow recovery of the Irminger interior after a year of particularly strong deep convection can be attributed to reduced transport of warm, buoyant eddies from the Irminger Current.On Greenland's continental shelf, cold, fresh waters insulate the Greenland Ice Sheet. Here, cross-shelf exchange that delivers heat on-shelf is studied. In Chapter 2, observations from a two-week ship-based survey of Narsaq Trough are used to investigate how troughs (glacially carved depressions in the continental shelf) modify the local continental shelf environment. This snapshot suggests that the trough drives a subsurface exchange flow that produces mid-depth waters in the trough that are a mixture of on-shelf and off-shelf waters. Chapter 3 contextualises the findings from Chapter 2 with two decades of repeat observations over Narsaq Trough by voluntary observing ships. This extensive time-series shows a bathymetrically-steered exchange flow is a persistent feature at the trough, both above and below the shelf, driving cross-shelf exchange of heat and salt.Cumulatively, the studies described here show how eddies and bathymetrically-steered flows at the boundaries of the sub-polar North Atlantic basins supply heat to regions which are unreachable by large-scale ocean processes.
- 일반주제명
- Physical oceanography
- 일반주제명
- Physical anthropology
- 일반주제명
- Climate change
- 키워드
- Greenland
- 키워드
- Ocean dynamics
- 키워드
- Ocean transport
- 기타저자
- University of California, San Diego Scripps Institution of Oceanography
- 기본자료저록
- Dissertations Abstracts International. 87-02A.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017357629
■00520260202103539
■006m o d
■007cr#unu||||||||
■020 ▼a9798291558232
■035 ▼a(MiAaPQ)AAI32040727
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a551.46
■1001 ▼aNelson, Monica.
■24510▼aObservations of Ocean Transport and Mixing Across Scales in the Subpolar North Atlantic and Greenland
■260 ▼a[Sl]▼bUniversity of California, San Diego▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a138 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-02, Section: A.
■500 ▼aAdvisor: Purkey, Sarah;Straneo, Fiammetta.
■5021 ▼aThesis (Ph.D.)--University of California, San Diego, 2025.
■520 ▼aOcean dynamics in the subpolar North Atlantic play an important role in the global climate system: Deep convection in the open ocean drives a large-scale overturning circulation that redistributes heat around the globe and cold currents circulating around Greenland protect marine-terminating glaciers from warmer water offshore that drives ice-melt and sea level rise. However, the drivers of natural variability within this complex system, and how the region will respond to anthropogenic forcing, are not fully understood. This thesis sheds light on two regions of the subpolar North Atlantic: the Irminger Sea and the Greenland continental shelf, where the mesoscale dynamics that deliver heat to these otherwise cold regions are studied.The Irminger Sea is a region of deep convection, contributing to the water mass transformation and large-scale circulation. In Chapter 1, observations from profiling Argo floats and repeat hydrography are used to track buoyancy changes in the Irminger interior and study the region's recovery from wintertime convection. This work shows that the slow recovery of the Irminger interior after a year of particularly strong deep convection can be attributed to reduced transport of warm, buoyant eddies from the Irminger Current.On Greenland's continental shelf, cold, fresh waters insulate the Greenland Ice Sheet. Here, cross-shelf exchange that delivers heat on-shelf is studied. In Chapter 2, observations from a two-week ship-based survey of Narsaq Trough are used to investigate how troughs (glacially carved depressions in the continental shelf) modify the local continental shelf environment. This snapshot suggests that the trough drives a subsurface exchange flow that produces mid-depth waters in the trough that are a mixture of on-shelf and off-shelf waters. Chapter 3 contextualises the findings from Chapter 2 with two decades of repeat observations over Narsaq Trough by voluntary observing ships. This extensive time-series shows a bathymetrically-steered exchange flow is a persistent feature at the trough, both above and below the shelf, driving cross-shelf exchange of heat and salt.Cumulatively, the studies described here show how eddies and bathymetrically-steered flows at the boundaries of the sub-polar North Atlantic basins supply heat to regions which are unreachable by large-scale ocean processes.
■590 ▼aSchool code: 0033.
■650 4▼aPhysical oceanography
■650 4▼aPhysical anthropology
■650 4▼aClimate change
■653 ▼aGreenland
■653 ▼aSubpolar North Atlantic
■653 ▼aOcean dynamics
■653 ▼aOcean transport
■690 ▼a0415
■690 ▼a0327
■690 ▼a0404
■71020▼aUniversity of California, San Diego▼bScripps Institution of Oceanography.
■7730 ▼tDissertations Abstracts International▼g87-02A.
■790 ▼a0033
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357629▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
