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Leveraging Historical Observational Data and Climate Models to Understand Uncertainties in Global Climate Diagnostics and Regional Climate Impacts
Leveraging Historical Observational Data and Climate Models to Understand Uncertainties in Global Climate Diagnostics and Regional Climate Impacts
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105321
- ISBN
- 9798297663879
- DDC
- 000
- 서명/저자
- Leveraging Historical Observational Data and Climate Models to Understand Uncertainties in Global Climate Diagnostics and Regional Climate Impacts
- 발행사항
- [Sl] : The Pennsylvania State University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 142 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
- 주기사항
- Advisor: Forest, Chris E.
- 학위논문주기
- Thesis (Ph.D.)--The Pennsylvania State University, 2025.
- 초록/해제
- 요약In this dissertation, we examine uncertainties in the climate system by investigating both global climate diagnostics and regional climate impacts by leveraging historical observational data and climate models. At the global scale, we quantify uncertainties in two different diagnostics-Equilibrium Climate Sensitivity (ECS) and Transient Climate Response (TCR). These global diagnostics are affected by the uncertainties in the historical observational datasets.In Chapter 2, we study observational datasets from four different data centers and quantify how their structural differences translate into differences in ECS and TCR. We use a model-observation comparison framework to estimate these climate metrics using the MIT Earth System Model (MESM). We find that differences among datasets can influence median estimates up to 0.44 °C for ECS. We assess the sensitivity of observational datasets to how they are grouped and observe that using products sharing identical Sea Surface Temperatures (SST) introduce discernible biases in climate sensitivity estimates.In Chapter 3, we extend the analysis to recently updated observational datasets. The data centers now provide estimates of uncertainty within their temperature datasets (intra-observational uncertainty for their own methodology). Two additional sensitivity analyses are performed, one examining National Oceanic and Atmospheric Administration (NOAA)'s 100-member ensembles separating land and ocean uncertainties, and another analyzing Hadley Centre Climatic Research Unit Temperature series version 5 (HadCRUT5)'s 200-member ensembles with and without spatial infilling. We find that intra-observational dataset uncertainties are four times larger than inter-observational dataset uncertainties, and that land surface air temperature uncertainties contribute seven times more to climate sensitivity metrics than sea surface temperature uncertainties. HadCRUT5's ensembles demonstrate that addressing coverage gaps through spatial infilling increases median climate sensitivity estimates by 0.2 °C.In Chapter 4, we analyze the climate impacts of historical afforestation in the MidAtlantic region of the United States. The Mid-Atlantic region experienced progressive afforestation as agriculture declined throughout the 20 th century, affecting both carbon sequestration and surface radiation balance. We found that afforestation lowered surface albedo by 1.5% during the highest conversion period (1920-1930). Forest growth enhanced carbon sequestration, with regional gross primary productivity in the Mid-Atlantic Region increasing from 5.0 to 6.5 g C m −2 day −1 between 1900-2000. By translating both effects into common units using the radiative forcing equivalent framework, we determined that 14% of carbon sequestration (6.0 Gt CO 2) were offset by albedo-related warming (0.8 Gt CO 2-eq).
- 일반주제명
- Vegetation
- 일반주제명
- Atmosphere
- 일반주제명
- Carbon
- 일반주제명
- Earth
- 일반주제명
- Aerosols
- 일반주제명
- Heat
- 일반주제명
- Probability distribution
- 일반주제명
- Climate science
- 일반주제명
- Radiation
- 일반주제명
- Climate change
- 일반주제명
- Statistics
- 기본자료저록
- Dissertations Abstracts International. 87-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■1001 ▼aSapkota, Vikrant.
■24510▼aLeveraging Historical Observational Data and Climate Models to Understand Uncertainties in Global Climate Diagnostics and Regional Climate Impacts
■260 ▼a[Sl]▼bThe Pennsylvania State University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a142 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-04, Section: B.
■500 ▼aAdvisor: Forest, Chris E.
■5021 ▼aThesis (Ph.D.)--The Pennsylvania State University, 2025.
■520 ▼aIn this dissertation, we examine uncertainties in the climate system by investigating both global climate diagnostics and regional climate impacts by leveraging historical observational data and climate models. At the global scale, we quantify uncertainties in two different diagnostics-Equilibrium Climate Sensitivity (ECS) and Transient Climate Response (TCR). These global diagnostics are affected by the uncertainties in the historical observational datasets.In Chapter 2, we study observational datasets from four different data centers and quantify how their structural differences translate into differences in ECS and TCR. We use a model-observation comparison framework to estimate these climate metrics using the MIT Earth System Model (MESM). We find that differences among datasets can influence median estimates up to 0.44 °C for ECS. We assess the sensitivity of observational datasets to how they are grouped and observe that using products sharing identical Sea Surface Temperatures (SST) introduce discernible biases in climate sensitivity estimates.In Chapter 3, we extend the analysis to recently updated observational datasets. The data centers now provide estimates of uncertainty within their temperature datasets (intra-observational uncertainty for their own methodology). Two additional sensitivity analyses are performed, one examining National Oceanic and Atmospheric Administration (NOAA)'s 100-member ensembles separating land and ocean uncertainties, and another analyzing Hadley Centre Climatic Research Unit Temperature series version 5 (HadCRUT5)'s 200-member ensembles with and without spatial infilling. We find that intra-observational dataset uncertainties are four times larger than inter-observational dataset uncertainties, and that land surface air temperature uncertainties contribute seven times more to climate sensitivity metrics than sea surface temperature uncertainties. HadCRUT5's ensembles demonstrate that addressing coverage gaps through spatial infilling increases median climate sensitivity estimates by 0.2 °C.In Chapter 4, we analyze the climate impacts of historical afforestation in the MidAtlantic region of the United States. The Mid-Atlantic region experienced progressive afforestation as agriculture declined throughout the 20 th century, affecting both carbon sequestration and surface radiation balance. We found that afforestation lowered surface albedo by 1.5% during the highest conversion period (1920-1930). Forest growth enhanced carbon sequestration, with regional gross primary productivity in the Mid-Atlantic Region increasing from 5.0 to 6.5 g C m −2 day −1 between 1900-2000. By translating both effects into common units using the radiative forcing equivalent framework, we determined that 14% of carbon sequestration (6.0 Gt CO 2) were offset by albedo-related warming (0.8 Gt CO 2-eq).
■590 ▼aSchool code: 0176.
■650 4▼aVegetation
■650 4▼aAtmosphere
■650 4▼aCarbon
■650 4▼aEarth
■650 4▼aAerosols
■650 4▼aHeat
■650 4▼aProbability distribution
■650 4▼aClimate science
■650 4▼aRadiation
■650 4▼aClimate change
■650 4▼aStatistics
■690 ▼a0404
■690 ▼a0463
■71020▼aThe Pennsylvania State University.
■7730 ▼tDissertations Abstracts International▼g87-04B.
■790 ▼a0176
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360198▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


