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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
The Dynamics and Impacts of Oxygen Minimum Zones in a Changing Ocean

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202104651
ISBN  
9798297600508
DDC  
551.46
저자명  
Ditkovsky, Sam J.
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  
Earth system modeling
키워드  
Ocean ventilation
키워드  
Oceanography
키워드  
Oxygen
키워드  
Oxygen minimum zones
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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■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.

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