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The Impact of Orbital Precession on Dynamics and Biogeochemistry in the Pacific and Southern Ocean
The Impact of Orbital Precession on Dynamics and Biogeochemistry in the Pacific and Southern Ocean
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104815
- ISBN
- 9798291576830
- DDC
- 551.6
- 서명/저자
- The Impact of Orbital Precession on Dynamics and Biogeochemistry in the Pacific and Southern Ocean
- 발행사항
- [Sl] : University of Colorado at Boulder, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 109 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
- 주기사항
- Advisor: Sanchez, Sara.
- 학위논문주기
- Thesis (Ph.D.)--University of Colorado at Boulder, 2025.
- 초록/해제
- 요약Orbital precession exerts a powerful influence on Earth's climate at ∼21,000 year timescales by moderating the intensity of the seasonal cycle in an asymmetric pattern across Earth's hemispheres. Precession has a significant fingerprint in paleoproxy records around the globe, particularly those with nonlinear rectifications, such as ice growth, monsoonal strength, and oceanic-atmospheric interactions of the Equatorial Pacific. Furthermore, orbital precession has a profound impact on the timing of glacial terminations, potentially promoting an outgassing of carbon from the deep oceans. In this dissertation, I use experiments from the NCAR Community Earth System Model (CESM) to examine the influence of orbital precession on the Southern and Pacific Oceans. I examine the role of precession in moderating air-sea CO2 flux in the Southern Ocean and find that precession shifts the southern westerlies, significantly modifying CO2 outgassing. I then examine the influence of precession on interannual dynamics in the equatorial Pacific. By modifying the seasonal location of Earth's thermal equator, precession can impact the ability of stochastic noise in the midlatitudes to influence the El Ni˜no-Southern Oscillation via the Pacific Meridional Mode. Finally, I examine the influence of orbital precession on the air-sea CO2 flux of the equatorial Pacific. Precession induces variations in surface winds that are accompanied by significant changes in air-sea CO2 flux via modifications in gas transfer velocity and surface pCO2 concentration. The results of this dissertation elucidate the physical mechanisms by which precession forcing influences the behavior of the Southern and Pacific Ocean, potentially contributing to the glacial-interglacial release of carbon from the deep oceans to the atmosphere. These mechanisms also have implications that extend to other climate forcings such as anthropogenic aerosols and volcanic eruptions.
- 일반주제명
- Paleoclimate science
- 일반주제명
- Biogeochemistry
- 일반주제명
- Climate change
- 일반주제명
- Atmospheric sciences
- 키워드
- Carbon
- 기타저자
- University of Colorado at Boulder Atmospheric and Oceanic Sciences
- 기본자료저록
- Dissertations Abstracts International. 87-02B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017358960
■00520260202104815
■006m o d
■007cr#unu||||||||
■020 ▼a9798291576830
■035 ▼a(MiAaPQ)AAI32168129
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a551.6
■1001 ▼aPersch, Cole Frederick.
■24510▼aThe Impact of Orbital Precession on Dynamics and Biogeochemistry in the Pacific and Southern Ocean
■260 ▼a[Sl]▼bUniversity of Colorado at Boulder▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a109 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-02, Section: B.
■500 ▼aAdvisor: Sanchez, Sara.
■5021 ▼aThesis (Ph.D.)--University of Colorado at Boulder, 2025.
■520 ▼aOrbital precession exerts a powerful influence on Earth's climate at ∼21,000 year timescales by moderating the intensity of the seasonal cycle in an asymmetric pattern across Earth's hemispheres. Precession has a significant fingerprint in paleoproxy records around the globe, particularly those with nonlinear rectifications, such as ice growth, monsoonal strength, and oceanic-atmospheric interactions of the Equatorial Pacific. Furthermore, orbital precession has a profound impact on the timing of glacial terminations, potentially promoting an outgassing of carbon from the deep oceans. In this dissertation, I use experiments from the NCAR Community Earth System Model (CESM) to examine the influence of orbital precession on the Southern and Pacific Oceans. I examine the role of precession in moderating air-sea CO2 flux in the Southern Ocean and find that precession shifts the southern westerlies, significantly modifying CO2 outgassing. I then examine the influence of precession on interannual dynamics in the equatorial Pacific. By modifying the seasonal location of Earth's thermal equator, precession can impact the ability of stochastic noise in the midlatitudes to influence the El Ni˜no-Southern Oscillation via the Pacific Meridional Mode. Finally, I examine the influence of orbital precession on the air-sea CO2 flux of the equatorial Pacific. Precession induces variations in surface winds that are accompanied by significant changes in air-sea CO2 flux via modifications in gas transfer velocity and surface pCO2 concentration. The results of this dissertation elucidate the physical mechanisms by which precession forcing influences the behavior of the Southern and Pacific Ocean, potentially contributing to the glacial-interglacial release of carbon from the deep oceans to the atmosphere. These mechanisms also have implications that extend to other climate forcings such as anthropogenic aerosols and volcanic eruptions.
■590 ▼aSchool code: 0051.
■650 4▼aPaleoclimate science
■650 4▼aBiogeochemistry
■650 4▼aClimate change
■650 4▼aAtmospheric sciences
■653 ▼aOrbital precession
■653 ▼aCommunity Earth System Model
■653 ▼aEquatorial Pacific
■653 ▼aPacific Meridional Mode
■653 ▼aCarbon
■690 ▼a0653
■690 ▼a0425
■690 ▼a0404
■690 ▼a0725
■71020▼aUniversity of Colorado at Boulder▼bAtmospheric and Oceanic Sciences.
■7730 ▼tDissertations Abstracts International▼g87-02B.
■790 ▼a0051
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358960▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
