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Atmospheric Mercury Dry Deposition Across Eastern North America: Addressing Data Gaps, Environmental Drivers, and Measurement Limitations
Atmospheric Mercury Dry Deposition Across Eastern North America: Addressing Data Gaps, Environmental Drivers, and Measurement Limitations
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103611
- ISBN
- 9798315713067
- DDC
- 628
- 저자명
- Yasar, Muge.
- 서명/저자
- Atmospheric Mercury Dry Deposition Across Eastern North America: Addressing Data Gaps, Environmental Drivers, and Measurement Limitations
- 발행사항
- [Sl] : The University of Wisconsin - Madison, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 123 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
- 주기사항
- Advisor: Schauer, James J.
- 학위논문주기
- Thesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
- 초록/해제
- 요약Mercury (Hg) is a globally distributed pollutant with serious ecological and health risks due to its toxicity, persistence, and ability to bioaccumulate. Dry deposition plays a major role in transferring mercury to ecosystems but remains poorly quantified due to limited data and modeling uncertainties.This dissertation aims to (1) evaluate long-term trends in total mercury deposition by reconstructing continuous speciated mercury concentration records using imputation methods, enabling decade-scale dry deposition modeling and integrated analysis with wet deposition data. (2) quantify the sensitivity of mercury dry deposition to environmental drivers linked to climate change for different mercury species, and (3) evaluate how the design of mercury monitoring strategies influence the accuracy and representation of modeled deposition fluxes and long-term trends in deposition.Chapter 2 presents a multi-site analysis of mercury dry deposition trends at Beltsville, Maryland; Stoneville, Mississippi; and Nova Scotia, Canada over a 10 year period. Concentration records were reconstructed using imputation techniques to enable continuous modeling. A bidirectional inferential model incorporating meteorological and land surface data was used to estimate dry deposition of GEM, GOM, and PBM, which was then analyzed alongside wet deposition data. The imputed concentration records produced a more complete and realistic mercury dataset, allowing improved estimation of both dry and total mercury deposition at each site. Dry deposition accounted for a large share of total mercury input, reinforcing the importance of characterizing both pathways.Chapter 3 examines the sensitivity of dry deposition fluxes to changes in solar radiation, vegetation coverage, wind speed, and relative humidity at the Maryland site. Findings show nonlinear and asymmetric responses, with solar radiation and vegetation as dominant drivers, underscoring the potential influence of climate change.Chapter 4 evaluates how the design of mercury monitoring strategies impact the ability to accurately model GEM deposition and demonstrates that using temporally averaged inputs- such as daily or monthly mean GEM concentrations- can introduce biases in modeled fluxes. It shows that daily inputs significantly improve performance over two-monthly data. While hourly resolution offers the highest fidelity, the improvement over daily is often minor, making daily averages a reliable alternative when hourly data is unavailable. This analysis helps define efficient monitoring thresholds while acknowledging the limitations of lower-resolution data.. Together, these studies advance the scientific basis for mercury dry deposition modeling by improving data completeness, identifying key drivers, and enabling better characterization of long-term trends in dry, wet, and total fluxes. The findings support policy evaluation and offer a framework for anticipating future monitoring and mercury emissions control measures.
- 일반주제명
- Atmospheric chemistry
- 일반주제명
- Ecology
- 일반주제명
- Climate change
- 키워드
- Mercury
- 키워드
- Toxicity
- 키워드
- GEM deposition
- 키워드
- North America
- 기타저자
- The University of Wisconsin - Madison Environmental Chemistry and Technology
- 기본자료저록
- Dissertations Abstracts International. 86-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■007cr#unu||||||||
■020 ▼a9798315713067
■035 ▼a(MiAaPQ)AAI32043385
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a628
■1001 ▼aYasar, Muge.
■24510▼aAtmospheric Mercury Dry Deposition Across Eastern North America: Addressing Data Gaps, Environmental Drivers, and Measurement Limitations
■260 ▼a[Sl]▼bThe University of Wisconsin - Madison▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a123 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-11, Section: B.
■500 ▼aAdvisor: Schauer, James J.
■5021 ▼aThesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
■520 ▼aMercury (Hg) is a globally distributed pollutant with serious ecological and health risks due to its toxicity, persistence, and ability to bioaccumulate. Dry deposition plays a major role in transferring mercury to ecosystems but remains poorly quantified due to limited data and modeling uncertainties.This dissertation aims to (1) evaluate long-term trends in total mercury deposition by reconstructing continuous speciated mercury concentration records using imputation methods, enabling decade-scale dry deposition modeling and integrated analysis with wet deposition data. (2) quantify the sensitivity of mercury dry deposition to environmental drivers linked to climate change for different mercury species, and (3) evaluate how the design of mercury monitoring strategies influence the accuracy and representation of modeled deposition fluxes and long-term trends in deposition.Chapter 2 presents a multi-site analysis of mercury dry deposition trends at Beltsville, Maryland; Stoneville, Mississippi; and Nova Scotia, Canada over a 10 year period. Concentration records were reconstructed using imputation techniques to enable continuous modeling. A bidirectional inferential model incorporating meteorological and land surface data was used to estimate dry deposition of GEM, GOM, and PBM, which was then analyzed alongside wet deposition data. The imputed concentration records produced a more complete and realistic mercury dataset, allowing improved estimation of both dry and total mercury deposition at each site. Dry deposition accounted for a large share of total mercury input, reinforcing the importance of characterizing both pathways.Chapter 3 examines the sensitivity of dry deposition fluxes to changes in solar radiation, vegetation coverage, wind speed, and relative humidity at the Maryland site. Findings show nonlinear and asymmetric responses, with solar radiation and vegetation as dominant drivers, underscoring the potential influence of climate change.Chapter 4 evaluates how the design of mercury monitoring strategies impact the ability to accurately model GEM deposition and demonstrates that using temporally averaged inputs- such as daily or monthly mean GEM concentrations- can introduce biases in modeled fluxes. It shows that daily inputs significantly improve performance over two-monthly data. While hourly resolution offers the highest fidelity, the improvement over daily is often minor, making daily averages a reliable alternative when hourly data is unavailable. This analysis helps define efficient monitoring thresholds while acknowledging the limitations of lower-resolution data.. Together, these studies advance the scientific basis for mercury dry deposition modeling by improving data completeness, identifying key drivers, and enabling better characterization of long-term trends in dry, wet, and total fluxes. The findings support policy evaluation and offer a framework for anticipating future monitoring and mercury emissions control measures.
■590 ▼aSchool code: 0262.
■650 4▼aEnvironmental engineering
■650 4▼aAtmospheric chemistry
■650 4▼aEcology
■650 4▼aClimate change
■653 ▼aMercury
■653 ▼aToxicity
■653 ▼aGEM deposition
■653 ▼aPolicy evaluation
■653 ▼aNorth America
■690 ▼a0775
■690 ▼a0371
■690 ▼a0404
■690 ▼a0329
■71020▼aThe University of Wisconsin - Madison▼bEnvironmental Chemistry and Technology.
■7730 ▼tDissertations Abstracts International▼g86-11B.
■790 ▼a0262
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357872▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


