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Carbon in Flux: Measuring the Climate Sensitivity of Terrestrial Greenhouse Gas Uptake
Carbon in Flux: Measuring the Climate Sensitivity of Terrestrial Greenhouse Gas Uptake
Carbon in Flux: Measuring the Climate Sensitivity of Terrestrial Greenhouse Gas Uptake

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202104753
ISBN  
9798290653730
DDC  
612
저자명  
Dion-Kirschner, Hannah.
서명/저자  
Carbon in Flux: Measuring the Climate Sensitivity of Terrestrial Greenhouse Gas Uptake
발행사항  
[Sl] : California Institute of Technology, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
172 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
주기사항  
Advisor: Sessions, Alex;Fischer, Woodward W.
학위논문주기  
Thesis (Ph.D.)--California Institute of Technology, 2025.
초록/해제  
요약The greenhouse gases carbon dioxide and methane exert a major control on Earth's climate, and their accumulation in the atmosphere is tempered by biological uptake. These biological uptake processes-photosynthesis and methanotrophy-are key contributors to the carbon-climate system, but their sensitivity to ongoing environmental change remains uncertain. In this thesis, I investigate how the ecophysiology of methanotrophy and photosynthesis dictate their response to perturbations in atmospheric composition, temperature, and other environmental variables. In Chapter 1, I present the first comprehensive compilation of kinetic measurements of methanotrophy in soils, and use this dataset to explore how kinetic properties may provide additional constraints to improve global models of the soil methane sink. Chapter 2 is a study of soil methane uptake rates in California dryland ecosystems and their relationship to local climate, ecology, and edaphic properties. This study reveals unique characteristics of dry climate regions that contradict typical assumptions about soil methane cycling. In Chapter 3, I present a novel method for position-specific carbon isotope analysis of submilligram glucose samples by Orbitrap mass spectrometry, and an application of this method to glucose standards isolated from C3 and C4 plants. In Chapter 4, I apply this new method to cellulose-derived glucose from tree-ring samples. Measurements of trees grown in climate chambers show how 13C-PSIA can disentangle changes in temperature, soil moisture, and tree carbon allocation. Finally, in two appendices, I describe methodological progress toward field-portable measurements of sedimentary porewater methane and the kinetics of soil methane uptake. Taken together, this work makes progress toward a more nuanced understanding of biological greenhouse gas uptake processes and their sensitivity to climate change.
일반주제명  
Physiology
일반주제명  
Biogeochemistry
일반주제명  
Methane
일반주제명  
Photosynthesis
일반주제명  
Scientific imaging
일반주제명  
Metabolism
일반주제명  
Climate change
일반주제명  
Mass spectrometry
일반주제명  
Vegetation
일반주제명  
Carbon sequestration
일반주제명  
Greenhouse gases
일반주제명  
Atmosphere
일반주제명  
Cellulose
일반주제명  
Carbon dioxide
일반주제명  
Glucose
일반주제명  
Trees
일반주제명  
Kinetics
일반주제명  
Carbon cycle
일반주제명  
Metabolites
기타저자  
California Institute of Technology Geological and Planetary Sciences
기본자료저록  
Dissertations Abstracts International. 87-01B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
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■1001  ▼aDion-Kirschner,  Hannah.
■24510▼aCarbon  in  Flux:  Measuring  the  Climate  Sensitivity  of  Terrestrial  Greenhouse  Gas  Uptake
■260    ▼a[Sl]▼bCalifornia  Institute  of  Technology▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a172  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-01,  Section:  B.
■500    ▼aAdvisor:  Sessions,  Alex;Fischer,  Woodward  W.
■5021  ▼aThesis  (Ph.D.)--California  Institute  of  Technology,  2025.
■520    ▼aThe  greenhouse  gases  carbon  dioxide  and  methane  exert  a  major  control  on  Earth's  climate,  and  their  accumulation  in  the  atmosphere  is  tempered  by  biological  uptake.  These  biological  uptake  processes-photosynthesis  and  methanotrophy-are  key  contributors  to  the  carbon-climate  system,  but  their  sensitivity  to  ongoing  environmental  change  remains  uncertain.  In  this  thesis,  I  investigate  how  the  ecophysiology  of  methanotrophy  and  photosynthesis  dictate  their  response  to  perturbations  in  atmospheric  composition,  temperature,  and  other  environmental  variables.  In  Chapter  1,  I  present  the  first  comprehensive  compilation  of  kinetic  measurements  of  methanotrophy  in  soils,  and  use  this  dataset  to  explore  how  kinetic  properties  may  provide  additional  constraints  to  improve  global  models  of  the  soil  methane  sink.  Chapter  2  is  a  study  of  soil  methane  uptake  rates  in  California  dryland  ecosystems  and  their  relationship  to  local  climate,  ecology,  and  edaphic  properties.  This  study  reveals  unique  characteristics  of  dry  climate  regions  that  contradict  typical  assumptions  about  soil  methane  cycling.  In  Chapter  3,  I  present  a  novel  method  for  position-specific  carbon  isotope  analysis  of  submilligram  glucose  samples  by  Orbitrap  mass  spectrometry,  and  an  application  of  this  method  to  glucose  standards  isolated  from  C3  and  C4  plants.  In  Chapter  4,  I  apply  this  new  method  to  cellulose-derived  glucose  from  tree-ring  samples.  Measurements  of  trees  grown  in  climate  chambers  show  how  13C-PSIA  can  disentangle  changes  in  temperature,  soil  moisture,  and  tree  carbon  allocation.  Finally,  in  two  appendices,  I  describe  methodological  progress  toward  field-portable  measurements  of  sedimentary  porewater  methane  and  the  kinetics  of  soil  methane  uptake.  Taken  together,  this  work  makes  progress  toward  a  more  nuanced  understanding  of  biological  greenhouse  gas  uptake  processes  and  their  sensitivity  to  climate  change.
■590    ▼aSchool  code:  0037.
■650  4▼aPhysiology
■650  4▼aBiogeochemistry
■650  4▼aMethane
■650  4▼aPhotosynthesis
■650  4▼aScientific  imaging
■650  4▼aMetabolism
■650  4▼aClimate  change
■650  4▼aMass  spectrometry
■650  4▼aVegetation
■650  4▼aCarbon  sequestration
■650  4▼aGreenhouse  gases
■650  4▼aAtmosphere
■650  4▼aCellulose
■650  4▼aCarbon  dioxide
■650  4▼aGlucose
■650  4▼aTrees
■650  4▼aKinetics
■650  4▼aCarbon  cycle
■650  4▼aMetabolites
■690    ▼a0404
■690    ▼a0425
■690    ▼a0719
■71020▼aCalifornia  Institute  of  Technology▼bGeological  and  Planetary  Sciences.
■7730  ▼tDissertations  Abstracts  International▼g87-01B.
■790    ▼a0037
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358799▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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