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Investigating Subglacial Processes Using Laboratory Experiments, Numerical Modeling, and Cosmogenic Nuclide Geochemistry
Investigating Subglacial Processes Using Laboratory Experiments, Numerical Modeling, and Cosmogenic Nuclide Geochemistry
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105003
- ISBN
- 9798288881893
- DDC
- 551
- 서명/저자
- Investigating Subglacial Processes Using Laboratory Experiments, Numerical Modeling, and Cosmogenic Nuclide Geochemistry
- 발행사항
- [Sl] : The University of Wisconsin - Madison, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 277 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
- 주기사항
- Includes supplementary digital materials.
- 주기사항
- Advisor: Marcott, Shaun A.;Zoet, Lucas K.
- 학위논문주기
- Thesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
- 초록/해제
- 요약Processes occurring underneath glaciers are important for a range of geologic and climatic phenomena. The process of basal slip facilitates fast glacier motion, thereby delivering ice from regions of net mass gain to regions of net mass loss. Glacial erosional processes shape alpine and polar landscapes with a range of characteristic landforms, grind rock into small particles with abundant chemically-reactive mineral surfaces, and provide material for paleoclimatic archives (e.g. proglacial lake sediments, ice-rafted debris). Subglacial chemical weathering occurs when eroded mineral surfaces meets meltwater, and glacial weathering products have a distinct stoichiometry compared to non-glacial fluvial environments, with implications for long-term changes in Earth's climate. Despite the importance of subglacial processes, it is difficult to observe these processes occurring in situ. In this dissertation, I investigate the three aforementioned subglacial processes (basal slip, erosion, chemical weathering) using a variety of approaches, including laboratory experiments that simulate subglacial motion, numerical models describing the flow of ice on both small (meter) and large (ice stream) scales, the monitoring of proglacial stream hydrology and weathering products, and cosmogenic nuclide geochemistry to explore the history of glacial advance and retreat and the rates of subglacial erosion.In Chapter 1, we use laboratory experiments, theory, and ice flow models to derive a new relation between glacier slip velocity and basal drag that incorporates the important but seldom-considered frictional influence of debris entrained in basal ice. In Chapter 2, we use paired measurements of cosmogenic nuclides (10Be, 14C) from an alpine glacier in southeastern Alaska to explore the controlling mechanisms of glacial erosion, the relative rates of abrasion and quarrying along a glacial landform, and discrepancies between erosion rates estimated from different methods. In Chapter 3, we use cosmogenic nuclides and a compilation of chronologic data from other sources to refine the advance and retreat history of the Green Bay Lobe of the Laurentide Ice Sheet during the last glacial period. We additionally estimate rates of subglacial erosion from this paleo-ice sheet setting. In Chapter 4, we compare measurements of stream discharge and major ion geochemistry from two proglacial streams in Alaska and identify linkages between the subglacial hydrological configuration and weathering regime.
- 일반주제명
- Geology
- 일반주제명
- Paleoclimate science
- 일반주제명
- Geomorphology
- 일반주제명
- Geochemistry
- 키워드
- Glacial erosion
- 키워드
- Glacier
- 키워드
- Glaciology
- 키워드
- Gorilla
- 키워드
- Ice sheet
- 기타저자
- The University of Wisconsin - Madison Geoscience
- 기본자료저록
- Dissertations Abstracts International. 87-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105003
■006m o d
■007cr#unu||||||||
■020 ▼a9798288881893
■035 ▼a(MiAaPQ)AAI32168324
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a551
■1001 ▼aBrooks, Jeremy P.
■24510▼aInvestigating Subglacial Processes Using Laboratory Experiments, Numerical Modeling, and Cosmogenic Nuclide Geochemistry
■260 ▼a[Sl]▼bThe University of Wisconsin - Madison▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a277 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-01, Section: B.
■500 ▼aIncludes supplementary digital materials.
■500 ▼aAdvisor: Marcott, Shaun A.;Zoet, Lucas K.
■5021 ▼aThesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
■520 ▼aProcesses occurring underneath glaciers are important for a range of geologic and climatic phenomena. The process of basal slip facilitates fast glacier motion, thereby delivering ice from regions of net mass gain to regions of net mass loss. Glacial erosional processes shape alpine and polar landscapes with a range of characteristic landforms, grind rock into small particles with abundant chemically-reactive mineral surfaces, and provide material for paleoclimatic archives (e.g. proglacial lake sediments, ice-rafted debris). Subglacial chemical weathering occurs when eroded mineral surfaces meets meltwater, and glacial weathering products have a distinct stoichiometry compared to non-glacial fluvial environments, with implications for long-term changes in Earth's climate. Despite the importance of subglacial processes, it is difficult to observe these processes occurring in situ. In this dissertation, I investigate the three aforementioned subglacial processes (basal slip, erosion, chemical weathering) using a variety of approaches, including laboratory experiments that simulate subglacial motion, numerical models describing the flow of ice on both small (meter) and large (ice stream) scales, the monitoring of proglacial stream hydrology and weathering products, and cosmogenic nuclide geochemistry to explore the history of glacial advance and retreat and the rates of subglacial erosion.In Chapter 1, we use laboratory experiments, theory, and ice flow models to derive a new relation between glacier slip velocity and basal drag that incorporates the important but seldom-considered frictional influence of debris entrained in basal ice. In Chapter 2, we use paired measurements of cosmogenic nuclides (10Be, 14C) from an alpine glacier in southeastern Alaska to explore the controlling mechanisms of glacial erosion, the relative rates of abrasion and quarrying along a glacial landform, and discrepancies between erosion rates estimated from different methods. In Chapter 3, we use cosmogenic nuclides and a compilation of chronologic data from other sources to refine the advance and retreat history of the Green Bay Lobe of the Laurentide Ice Sheet during the last glacial period. We additionally estimate rates of subglacial erosion from this paleo-ice sheet setting. In Chapter 4, we compare measurements of stream discharge and major ion geochemistry from two proglacial streams in Alaska and identify linkages between the subglacial hydrological configuration and weathering regime.
■590 ▼aSchool code: 0262.
■650 4▼aGeology
■650 4▼aPaleoclimate science
■650 4▼aGeomorphology
■650 4▼aGeochemistry
■653 ▼aGlacial chemical weathering
■653 ▼aGlacial erosion
■653 ▼aGlacier
■653 ▼aGlaciology
■653 ▼aGorilla
■653 ▼aIce sheet
■690 ▼a0372
■690 ▼a0653
■690 ▼a0484
■690 ▼a0996
■71020▼aThe University of Wisconsin - Madison▼bGeoscience.
■7730 ▼tDissertations Abstracts International▼g87-01B.
■790 ▼a0262
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359290▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


