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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 C...
Investigating Subglacial Processes Using Laboratory Experiments, Numerical Modeling, and Cosmogenic Nuclide Geochemistry

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105003
ISBN  
9798288881893
DDC  
551
저자명  
Brooks, Jeremy P.
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 chemical weathering
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  
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■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.

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