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Modeling the Global Atmospheric Response to Persistent Regional SST Anomalies in the North Atlantic Ocean
Modeling the Global Atmospheric Response to Persistent Regional SST Anomalies in the North Atlantic Ocean
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202102955
- ISBN
- 9798315730408
- DDC
- 551.5
- 서명/저자
- Modeling the Global Atmospheric Response to Persistent Regional SST Anomalies in the North Atlantic Ocean
- 발행사항
- [Sl] : University of Colorado at Boulder, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 123 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
- 주기사항
- Advisor: Karnauskas, Kristopher B.
- 학위논문주기
- Thesis (Ph.D.)--University of Colorado at Boulder, 2025.
- 초록/해제
- 요약Sea surface temperature (SST) trends in the midlatitudes drive ocean-atmosphere feedbacks with implications for regional and global climate variability. The North Atlantic Warming Hole (NAWH), a cooling trend in the subpolar North Atlantic observed since 1870 despite warming global oceans, forces an atmospheric response that may be important for such impacts as well as feedbacks on the NAWH itself. Global atmospheric model experiments demonstrate that the NAWH enhances local wind speeds and surface heat fluxes due to its interaction with the jet stream, establishing a positive feedback that sustains cold SST anomalies. The latitude of the NAWH has a secondary influence on the jet stream response, but proximity to the subpolar jet appears essential for amplifying feedbacks. Extending this methodology, a targeted model intercomparison project (MIP) involving thirteen atmospheric general circulation model (AGCM) configurations confirms that resolution, vertical stability, and jet stream representation critically shape the atmospheric response to the NAWH. The experiments conducted under this MIP, which were planned, developed and executed as part of my research, broadly reveal a high sensitivity of the simulated atmospheric response to model configuration, particularly in capturing NAO-related variability and its downstream impacts on European hydroclimate, and reveal robust agreement on extratropical SST forcing influencing the tropical Atlantic. In Chapter 4, a study of the marine heatwave (MHW) appearing since 2012 off the U.S. Mid-Atlantic Coast highlights how warm SST anomalies elicit a distinct and consistent atmospheric response. Similarly designed AGCM experiments show that the warm anomaly produces a low SLP response that produces cyclonic surface winds and associated stress driving changes in Ekman pumping, sea level, and geostrophic currents. Over time, this generates a negative feedback dominated by horizontal temperature advection, overtaking the role of latent heat flux after about two years. Together, these studies identify the key mechanisms by which midlatitude SST anomalies, both warm and cold, interact with the atmosphere to modulate emergent climate signals and some of their impacts. By addressing the dependencies of atmospheric responses to prescribed SST forcing on model configuration and emphasizing the role of coupled feedbacks in both the persistence and dissipation of such signals, this work provides a more comprehensive understanding of midlatitude ocean-atmosphere coupling in a warming world.
- 일반주제명
- Atmospheric sciences
- 일반주제명
- Physical oceanography
- 일반주제명
- Geophysics
- 일반주제명
- Meteorology
- 키워드
- Jet stream
- 키워드
- Ocean-atmosphere
- 기타저자
- University of Colorado at Boulder Atmospheric and Oceanic Sciences
- 기본자료저록
- Dissertations Abstracts International. 86-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■006m o d
■007cr#unu||||||||
■020 ▼a9798315730408
■035 ▼a(MiAaPQ)AAI31769182
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a551.5
■1001 ▼aKramer, Sydney M.▼0(orcid)0009-0004-5508-216X
■24510▼aModeling the Global Atmospheric Response to Persistent Regional SST Anomalies in the North Atlantic Ocean
■260 ▼a[Sl]▼bUniversity of Colorado at Boulder▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a123 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-11, Section: B.
■500 ▼aAdvisor: Karnauskas, Kristopher B.
■5021 ▼aThesis (Ph.D.)--University of Colorado at Boulder, 2025.
■520 ▼aSea surface temperature (SST) trends in the midlatitudes drive ocean-atmosphere feedbacks with implications for regional and global climate variability. The North Atlantic Warming Hole (NAWH), a cooling trend in the subpolar North Atlantic observed since 1870 despite warming global oceans, forces an atmospheric response that may be important for such impacts as well as feedbacks on the NAWH itself. Global atmospheric model experiments demonstrate that the NAWH enhances local wind speeds and surface heat fluxes due to its interaction with the jet stream, establishing a positive feedback that sustains cold SST anomalies. The latitude of the NAWH has a secondary influence on the jet stream response, but proximity to the subpolar jet appears essential for amplifying feedbacks. Extending this methodology, a targeted model intercomparison project (MIP) involving thirteen atmospheric general circulation model (AGCM) configurations confirms that resolution, vertical stability, and jet stream representation critically shape the atmospheric response to the NAWH. The experiments conducted under this MIP, which were planned, developed and executed as part of my research, broadly reveal a high sensitivity of the simulated atmospheric response to model configuration, particularly in capturing NAO-related variability and its downstream impacts on European hydroclimate, and reveal robust agreement on extratropical SST forcing influencing the tropical Atlantic. In Chapter 4, a study of the marine heatwave (MHW) appearing since 2012 off the U.S. Mid-Atlantic Coast highlights how warm SST anomalies elicit a distinct and consistent atmospheric response. Similarly designed AGCM experiments show that the warm anomaly produces a low SLP response that produces cyclonic surface winds and associated stress driving changes in Ekman pumping, sea level, and geostrophic currents. Over time, this generates a negative feedback dominated by horizontal temperature advection, overtaking the role of latent heat flux after about two years. Together, these studies identify the key mechanisms by which midlatitude SST anomalies, both warm and cold, interact with the atmosphere to modulate emergent climate signals and some of their impacts. By addressing the dependencies of atmospheric responses to prescribed SST forcing on model configuration and emphasizing the role of coupled feedbacks in both the persistence and dissipation of such signals, this work provides a more comprehensive understanding of midlatitude ocean-atmosphere coupling in a warming world.
■590 ▼aSchool code: 0051.
■650 4▼aAtmospheric sciences
■650 4▼aPhysical oceanography
■650 4▼aGeophysics
■650 4▼aMeteorology
■653 ▼aModel intercomparison project
■653 ▼aJet stream
■653 ▼aSea surface temperature
■653 ▼aOcean-atmosphere
■690 ▼a0725
■690 ▼a0415
■690 ▼a0557
■690 ▼a0373
■71020▼aUniversity of Colorado at Boulder▼bAtmospheric and Oceanic Sciences.
■7730 ▼tDissertations Abstracts International▼g86-11B.
■790 ▼a0051
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17356575▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
