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Brown Carbon in an Earth System Model: A Scheme to Study Biomass Burning Aerosols
Brown Carbon in an Earth System Model: A Scheme to Study Biomass Burning Aerosols
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103616
- ISBN
- 9798283138817
- DDC
- 577
- 서명/저자
- Brown Carbon in an Earth System Model: A Scheme to Study Biomass Burning Aerosols
- 발행사항
- [Sl] : Columbia University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 205 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
- 주기사항
- Advisor: Tsigaridis, Kostas;Bauer, Susanne E.
- 학위논문주기
- Thesis (Ph.D.)--Columbia University, 2025.
- 초록/해제
- 요약Organic aerosols (OAs) are important, short-lived climate forcers that cool the atmosphere. However, there is significant uncertainty in the magnitude of their cooling effect, posing a large gap in aerosol science and modeling. Growing wildfire frequency and intensity, along with reduction of other aerosol sources via emission controls and cleaner technologies, are increasing the prominence of OAs in the atmosphere, making this a priority for model improvement. This dissertation advances organic and biomass burning (BB) aerosol modeling by explicitly representing brown carbon (BrC) aerosols, OAs that absorb UV-to-visible light and are primarily emitted by BB, in an Earth system model (ESM). In the first part of this work, a BrC scheme was developed and implemented in the NASA GISS ModelE ESM ("ModelE") through the definition of four key properties and processes: BB emissions of BrC, secondary formation of BrC as biogenic secondary organic aerosols (SOAs), optical properties of both primary and secondary BrC, and the chemical aging of primary BrC. The latter was simulated through a novel aging scheme, which utilizes local oxidant concentrations to increase (brown) then decrease (bleach) BrC light absorption.The remainder of the dissertation details the evaluation of this BrC scheme. To start, model sensitivity tests were conducted to understand the overall impact of BrC in ModelE. Model simulation of total aerosol properties, specifically optical depth, with the addition of this scheme was also evaluated against Aerosol Robotic Network (AERONET) and Moderate Resolution Imaging Spectroradiometer (MODIS) retrieval data. These initial assessments revealed that, on a global scale, while explicit representation of BrC, the inclusion of secondary BrC, and simulated bleaching had distinguishable effects in the model, varied optical properties and emission ratios did not. Further, model total optical depth performance was unchanged with the addition of BrC. This left several scheme parameters unconstrained, and necessitated evaluation against BrC-specific data. The next stage of evaluation constrained scheme parameters by harmonizing them with the aerosol property assumptions of an AERONET retrieval of BrC, resulting in a relative improvement in model performance. This model-retrieval comparison, which focused on BB regions and seasons, created an alternative scheme configuration grounded in measured radiance fields represented by the retrieval. The alternative case was not, however, indicative of in-situ microphysical and chemical processes. As such, the final stage of work was an extensive evaluation of ModelE OAs and BrC against in-situ measurements from flight campaigns. Focusing on vertical profile comparisons, and looking at BB-influenced aerosols wherever possible, this revealed systematic underestimation in BrC absorption. Introducing variable OA-to-OC ratios and reducing the water-solubility of BrC improved model performance in an updated scheme, but there was still persistent model bias. The dissertation concludes with a discussion of further model improvements, as well as advances in measurement and satellite data, that could help address remaining bias and uncertainty.In-depth analysis of the ModelE BrC scheme allowed for the exploration of the BrC parameter space and investigation of potential sources of biases, while at the same time highlighting the usefulness of different atmospheric science tools in model development and evaluation. The product of this dissertation is a scheme within an ESM that has several applications: estimating the radiative effect of OA absorption-between 0.03-0.04 W m-2 according to different scheme configurations-improving satellite retrieval algorithms, and, in general, furthering the study of biomass burning and organic aerosols.
- 일반주제명
- Environmental science
- 일반주제명
- Climate change
- 일반주제명
- Atmospheric chemistry
- 키워드
- Aerosols
- 키워드
- Climate modeling
- 키워드
- Fires
- 키워드
- Biomass burning
- 기타저자
- Columbia University Earth and Environmental Sciences
- 기본자료저록
- Dissertations Abstracts International. 86-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■007cr#unu||||||||
■020 ▼a9798283138817
■035 ▼a(MiAaPQ)AAI32044639
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a577
■1001 ▼aDeLessio, Maegan Anne.
■24510▼aBrown Carbon in an Earth System Model: A Scheme to Study Biomass Burning Aerosols
■260 ▼a[Sl]▼bColumbia University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a205 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-12, Section: B.
■500 ▼aAdvisor: Tsigaridis, Kostas;Bauer, Susanne E.
■5021 ▼aThesis (Ph.D.)--Columbia University, 2025.
■520 ▼aOrganic aerosols (OAs) are important, short-lived climate forcers that cool the atmosphere. However, there is significant uncertainty in the magnitude of their cooling effect, posing a large gap in aerosol science and modeling. Growing wildfire frequency and intensity, along with reduction of other aerosol sources via emission controls and cleaner technologies, are increasing the prominence of OAs in the atmosphere, making this a priority for model improvement. This dissertation advances organic and biomass burning (BB) aerosol modeling by explicitly representing brown carbon (BrC) aerosols, OAs that absorb UV-to-visible light and are primarily emitted by BB, in an Earth system model (ESM). In the first part of this work, a BrC scheme was developed and implemented in the NASA GISS ModelE ESM ("ModelE") through the definition of four key properties and processes: BB emissions of BrC, secondary formation of BrC as biogenic secondary organic aerosols (SOAs), optical properties of both primary and secondary BrC, and the chemical aging of primary BrC. The latter was simulated through a novel aging scheme, which utilizes local oxidant concentrations to increase (brown) then decrease (bleach) BrC light absorption.The remainder of the dissertation details the evaluation of this BrC scheme. To start, model sensitivity tests were conducted to understand the overall impact of BrC in ModelE. Model simulation of total aerosol properties, specifically optical depth, with the addition of this scheme was also evaluated against Aerosol Robotic Network (AERONET) and Moderate Resolution Imaging Spectroradiometer (MODIS) retrieval data. These initial assessments revealed that, on a global scale, while explicit representation of BrC, the inclusion of secondary BrC, and simulated bleaching had distinguishable effects in the model, varied optical properties and emission ratios did not. Further, model total optical depth performance was unchanged with the addition of BrC. This left several scheme parameters unconstrained, and necessitated evaluation against BrC-specific data. The next stage of evaluation constrained scheme parameters by harmonizing them with the aerosol property assumptions of an AERONET retrieval of BrC, resulting in a relative improvement in model performance. This model-retrieval comparison, which focused on BB regions and seasons, created an alternative scheme configuration grounded in measured radiance fields represented by the retrieval. The alternative case was not, however, indicative of in-situ microphysical and chemical processes. As such, the final stage of work was an extensive evaluation of ModelE OAs and BrC against in-situ measurements from flight campaigns. Focusing on vertical profile comparisons, and looking at BB-influenced aerosols wherever possible, this revealed systematic underestimation in BrC absorption. Introducing variable OA-to-OC ratios and reducing the water-solubility of BrC improved model performance in an updated scheme, but there was still persistent model bias. The dissertation concludes with a discussion of further model improvements, as well as advances in measurement and satellite data, that could help address remaining bias and uncertainty.In-depth analysis of the ModelE BrC scheme allowed for the exploration of the BrC parameter space and investigation of potential sources of biases, while at the same time highlighting the usefulness of different atmospheric science tools in model development and evaluation. The product of this dissertation is a scheme within an ESM that has several applications: estimating the radiative effect of OA absorption-between 0.03-0.04 W m-2 according to different scheme configurations-improving satellite retrieval algorithms, and, in general, furthering the study of biomass burning and organic aerosols.
■590 ▼aSchool code: 0054.
■650 4▼aEnvironmental science
■650 4▼aClimate change
■650 4▼aAtmospheric chemistry
■653 ▼aAerosols
■653 ▼aClimate modeling
■653 ▼aFires
■653 ▼aEarth system model
■653 ▼aBiomass burning
■690 ▼a0768
■690 ▼a0404
■690 ▼a0371
■71020▼aColumbia University▼bEarth and Environmental Sciences.
■7730 ▼tDissertations Abstracts International▼g86-12B.
■790 ▼a0054
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357909▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


