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Applications of Carbonate Clumped Isotope Paleothermometry to Land Snails for the Reconstruction of Last Glacial Maximum Climates
Applications of Carbonate Clumped Isotope Paleothermometry to Land Snails for the Reconstruction of Last Glacial Maximum Climates
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105301
- ISBN
- 9798263322533
- DDC
- 551.6
- 서명/저자
- Applications of Carbonate Clumped Isotope Paleothermometry to Land Snails for the Reconstruction of Last Glacial Maximum Climates
- 발행사항
- [Sl] : University of California, Los Angeles, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 256 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Tripati, Aradhna K.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Los Angeles, 2025.
- 초록/해제
- 요약Land snails are responsive to surface air temperatures, moisture input, and seasonality changes. They are ubiquitous in the Quaternary geologic record, thus serving as archives of environmental and climatic changes. This dissertation explores the use of clumped and bulk stable isotope compositions in land snail shells to understand the terrestrial hydrologic cycle during the Last Glacial Maximum, 26 - 19 kya. Chapter 1 focuses on understanding the modern systematics of clumped isotope values in a suite of land snail shells collected in the Northern Hemisphere and investigates reconstructing water δ18O using these temperature constraints. In Chapter 2, we apply the proxy system model developed in Chapter 1 to a case study in the Canary Islands. By examining a modern and LGM-aged set of land snail shells, we deduce a 13-degree cooling on the island. We compare to a suite of climate models from PMIP3, PMIP4, and the BRIDGE group of models, and find that all models underestimate the degree of cooling in the Canary Islands during the LGM. Reconstructed water δ18O shows that source precipitation has not changed since the LGM. In Chapter 3, we examine fossil land snail shells collected from a north-south transect of the Mississippi River Valley (MRV) to understand the summertime meridional temperature gradient south of the Laurentide Ice Sheet. We also use our temperature data to help reconstruct the isotopic composition of summertime precipitation to understand how the hypothesis of a dry ECUS as reciprocal to a wet west may have played out. In concert with model analysis of the isotope-enabled HadCM3 21 ka simulation, we find evidence consistent with depleted precipitation isotopes possibly from increased precipitation along this margin, or depleted precipitation isotopes due to much colder temperatures caused by the LIS.
- 일반주제명
- Paleoclimate science
- 일반주제명
- Climate change
- 일반주제명
- Geochemistry
- 키워드
- Land snails
- 기타저자
- University of California, Los Angeles Geochemistry 0393
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■006m o d
■007cr#unu||||||||
■020 ▼a9798263322533
■035 ▼a(MiAaPQ)AAI32281627
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a551.6
■1001 ▼aBricker, Hayley Lauren.
■24510▼aApplications of Carbonate Clumped Isotope Paleothermometry to Land Snails for the Reconstruction of Last Glacial Maximum Climates
■260 ▼a[Sl]▼bUniversity of California, Los Angeles▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a256 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Tripati, Aradhna K.
■5021 ▼aThesis (Ph.D.)--University of California, Los Angeles, 2025.
■520 ▼aLand snails are responsive to surface air temperatures, moisture input, and seasonality changes. They are ubiquitous in the Quaternary geologic record, thus serving as archives of environmental and climatic changes. This dissertation explores the use of clumped and bulk stable isotope compositions in land snail shells to understand the terrestrial hydrologic cycle during the Last Glacial Maximum, 26 - 19 kya. Chapter 1 focuses on understanding the modern systematics of clumped isotope values in a suite of land snail shells collected in the Northern Hemisphere and investigates reconstructing water δ18O using these temperature constraints. In Chapter 2, we apply the proxy system model developed in Chapter 1 to a case study in the Canary Islands. By examining a modern and LGM-aged set of land snail shells, we deduce a 13-degree cooling on the island. We compare to a suite of climate models from PMIP3, PMIP4, and the BRIDGE group of models, and find that all models underestimate the degree of cooling in the Canary Islands during the LGM. Reconstructed water δ18O shows that source precipitation has not changed since the LGM. In Chapter 3, we examine fossil land snail shells collected from a north-south transect of the Mississippi River Valley (MRV) to understand the summertime meridional temperature gradient south of the Laurentide Ice Sheet. We also use our temperature data to help reconstruct the isotopic composition of summertime precipitation to understand how the hypothesis of a dry ECUS as reciprocal to a wet west may have played out. In concert with model analysis of the isotope-enabled HadCM3 21 ka simulation, we find evidence consistent with depleted precipitation isotopes possibly from increased precipitation along this margin, or depleted precipitation isotopes due to much colder temperatures caused by the LIS.
■590 ▼aSchool code: 0031.
■650 4▼aPaleoclimate science
■650 4▼aClimate change
■650 4▼aGeochemistry
■653 ▼aLand snails
■653 ▼aQuaternary geologic record
■653 ▼aMississippi River Valley
■690 ▼a0653
■690 ▼a0404
■690 ▼a0996
■71020▼aUniversity of California, Los Angeles▼bGeochemistry 0393.
■7730 ▼tDissertations Abstracts International▼g87-05B.
■790 ▼a0031
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360085▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
