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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
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104753
- ISBN
- 9798290653730
- DDC
- 612
- 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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■00520260202104753
■006m o d
■007cr#unu||||||||
■020 ▼a9798290653730
■035 ▼a(MiAaPQ)AAI32151364
■035 ▼a(MiAaPQ)Caltech17324
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a612
■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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