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The Dynamics and Impacts of Oxygen Minimum Zones in a Changing Ocean
The Dynamics and Impacts of Oxygen Minimum Zones in a Changing Ocean
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104651
- ISBN
- 9798297600508
- DDC
- 551.46
- 서명/저자
- The Dynamics and Impacts of Oxygen Minimum Zones in a Changing Ocean
- 발행사항
- [Sl] : Princeton University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 324 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
- 주기사항
- Advisor: Resplandy, Laure.
- 학위논문주기
- Thesis (Ph.D.)--Princeton University, 2025.
- 초록/해제
- 요약Oxygen minimum zones (OMZs) are naturally occurring ocean regions with extremely low oxygen levels, maintained by a combination of sluggish physical oxygen supply and high biological demand. Chapters 1 and 2 introduce the physical and biogeochemical mechanisms that form OMZs and explore how these processes are being affected by climate change. As the ocean deoxygenates with warming, uncertainty remains over whether OMZs will intensify or diminish. This thesis examines the future evolution of OMZs and their ecological consequences.Chapter 3 presents a novel water mass framework to analyze global oxygen dynamics using an ensemble of Earth System Model (ESM) projections. The framework identifies consistent patterns across the ensemble and enables improved constraints on future oxygen levels by evaluating model skill. Models that better match present-day observations project weaker global deoxygenation and increased oxygen supply to OMZs under warming compared to more biased models.Chapter 4 focuses on regional projections for the tropical Pacific and Indian Ocean OMZs. Across models, OMZs show a consistent three-regime response: core regions contract and peripheral layers expand, while an intermediate transition zone between exhibits little change in volume. This interpretive framework reconciles discrepancies between models, observational data, and paleoceanographic records. In the Indian Ocean, oxygen transport via the Indonesian Throughflow and marginal seas emerges as a key driver of the OMZ response.Chapter 5 explores ecological impacts in the tropical Pacific using an ecosystem model applied to ESM projections. Although oxygen increases near OMZ cores, warming raises fish metabolic demand and offsets potential habitat gains. Finally in Chapter 6, I develop and apply a high-resolution regional model of the Indian Ocean to assess the role of tidal processes on biogeochemical cycling. While tides enhance productivity and respiration, they also promote vertical mixing that supports oxygen supply to the OMZ, likely sustaining higher thermocline oxygen concentrations overall.I conclude the thesis by synthesizing these findings to reassess the robustness of our understanding for how OMZs will respond in a warming world.
- 일반주제명
- Physical oceanography
- 일반주제명
- Biogeochemistry
- 일반주제명
- Chemical oceanography
- 일반주제명
- Atmospheric sciences
- 키워드
- Oceanography
- 키워드
- Oxygen
- 기타저자
- Princeton University Atmospheric and Oceanic Sciences
- 기본자료저록
- Dissertations Abstracts International. 87-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■006m o d
■007cr#unu||||||||
■020 ▼a9798297600508
■035 ▼a(MiAaPQ)AAI32115296
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a551.46
■1001 ▼aDitkovsky, Sam J.▼0(orcid)0000-0002-4759-9829
■24510▼aThe Dynamics and Impacts of Oxygen Minimum Zones in a Changing Ocean
■260 ▼a[Sl]▼bPrinceton University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a324 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-04, Section: B.
■500 ▼aAdvisor: Resplandy, Laure.
■5021 ▼aThesis (Ph.D.)--Princeton University, 2025.
■520 ▼aOxygen minimum zones (OMZs) are naturally occurring ocean regions with extremely low oxygen levels, maintained by a combination of sluggish physical oxygen supply and high biological demand. Chapters 1 and 2 introduce the physical and biogeochemical mechanisms that form OMZs and explore how these processes are being affected by climate change. As the ocean deoxygenates with warming, uncertainty remains over whether OMZs will intensify or diminish. This thesis examines the future evolution of OMZs and their ecological consequences.Chapter 3 presents a novel water mass framework to analyze global oxygen dynamics using an ensemble of Earth System Model (ESM) projections. The framework identifies consistent patterns across the ensemble and enables improved constraints on future oxygen levels by evaluating model skill. Models that better match present-day observations project weaker global deoxygenation and increased oxygen supply to OMZs under warming compared to more biased models.Chapter 4 focuses on regional projections for the tropical Pacific and Indian Ocean OMZs. Across models, OMZs show a consistent three-regime response: core regions contract and peripheral layers expand, while an intermediate transition zone between exhibits little change in volume. This interpretive framework reconciles discrepancies between models, observational data, and paleoceanographic records. In the Indian Ocean, oxygen transport via the Indonesian Throughflow and marginal seas emerges as a key driver of the OMZ response.Chapter 5 explores ecological impacts in the tropical Pacific using an ecosystem model applied to ESM projections. Although oxygen increases near OMZ cores, warming raises fish metabolic demand and offsets potential habitat gains. Finally in Chapter 6, I develop and apply a high-resolution regional model of the Indian Ocean to assess the role of tidal processes on biogeochemical cycling. While tides enhance productivity and respiration, they also promote vertical mixing that supports oxygen supply to the OMZ, likely sustaining higher thermocline oxygen concentrations overall.I conclude the thesis by synthesizing these findings to reassess the robustness of our understanding for how OMZs will respond in a warming world.
■590 ▼aSchool code: 0181.
■650 4▼aPhysical oceanography
■650 4▼aBiogeochemistry
■650 4▼aChemical oceanography
■650 4▼aAtmospheric sciences
■653 ▼aEarth system modeling
■653 ▼aOcean ventilation
■653 ▼aOceanography
■653 ▼aOxygen
■653 ▼aOxygen minimum zones
■690 ▼a0415
■690 ▼a0425
■690 ▼a0403
■690 ▼a0725
■71020▼aPrinceton University▼bAtmospheric and Oceanic Sciences.
■7730 ▼tDissertations Abstracts International▼g87-04B.
■790 ▼a0181
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358368▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


