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Field Measurements of Trace Gases in an Agricultural Region: Identification and Characterization of Aerosol Growth Precursors and Organic Pollutants
Field Measurements of Trace Gases in an Agricultural Region: Identification and Characterization of Aerosol Growth Precursors and Organic Pollutants
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260311091509.5
- ISBN
- 9798315701934
- DDC
- 551.51
- 서명/저자
- Field Measurements of Trace Gases in an Agricultural Region: Identification and Characterization of Aerosol Growth Precursors and Organic Pollutants / Daniel John Katz
- 발행사항
- [Sl] : University of Colorado at Boulder, 2025
- 형태사항
- 1 electronic resource (204 pages)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
- 주기사항
- Advisors: Browne, Eleanor Committee members: Stark, Harald; de Gouw, Joost; Jiménez, José-Luis; Volkamer, Rainer.
- 학위논문주기
- - Ph.D. : University of Colorado at Boulder, 2025.
- 초록/해제
- 요약Atmospheric aerosols affect the climate by influencing radiative forcing and negatively impact human health as pollutants. Trace gases are crucial in the life cycle of atmospheric aerosols, forming aerosols via new particle formation (NPF) and growing aerosols through condensation of low volatility gases. Gas-phase pollutants can partition onto aerosols, exacerbating negative health effects of aerosol exposure and affecting their ability to undergo long-range transport. However, measurements of trace gases in agricultural regions, which account for a large portion of global land use, are limited. This dissertation presents field measurements of trace gases made in the agricultural Southern Great Plains.In the first study, field measurements of ambient ions made in summer 2016 with an atmospheric pressure interface time-of-flight mass spectrometer are used to characterize trace gases relevant to aerosol formation and growth. A data analysis approach combining binned positive matrix factorization and generalized Kendrick analysis increases the chemical information and temporal resolution available from the dataset. Negative mode ions include clusters of NO3- with highly oxygenated isoprene, monoterpene, and sesquiterpene oxidation products. Sesquiterpene organonitrates dominate the signal of the lowest volatility organic compounds. Positive ion measurements suggest that ammonia and amines are the most abundant bases which may participate in NPF. Building on the first study, the second study presents measurements made with a nitrate anion chemical ionization mass spectrometer (NO3-CIMS) deployed at SGP in May 2023. NO3- CIMS measurements show that the majority of semi-volatile and low volatility compounds are formed by isoprene and monoterpene oxidation but confirm that the lowest volatility species are formed by sesquiterpene oxidation. Organic nitrates contribute a large fraction of aerosol growth precursors.The third study presents NO3-CIMS measurements of atmospheric medium-chain chlorinated paraffins (MCCPs), high production volume industrial chemicals which are toxic and ubiquitous environmental pollutants. Few atmospheric measurements of MCCPs have been reported, and current measurements rely on offline techniques with long sample collection times. The high temporal resolution of the NO3-CIMS is used to investigate the behavior of MCCPs in real time and shows that partitioning between aerosols and the gas phase controls the gas-phase MCCP signal.
- 언어주기
- English
- 일반주제명
- Atmospheric chemistry
- 일반주제명
- Analytical chemistry
- 일반주제명
- Environmental science
- 키워드
- Aerosols
- 키워드
- Ambient ions
- 기타저자
- University of Colorado at Boulder Chemistry
- 기본자료저록
- Dissertations Abstracts International. 86-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■006m o d
■007cr|nu||||||||
■020 ▼a9798315701934
■040 ▼aMiAaPQD▼beng▼cMiAaPQD▼erda
■082 ▼a551.51
■1001 ▼aKatz, Daniel John▼eauthor.▼0(orcid)0000-0001-5673-0131
■24510▼aField Measurements of Trace Gases in an Agricultural Region: Identification and Characterization of Aerosol Growth Precursors and Organic Pollutants ▼cDaniel John Katz
■260 ▼a[Sl]▼bUniversity of Colorado at Boulder▼c2025
■264 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a1 electronic resource (204 pages)
■336 ▼atext▼btxt▼2rdacontent
■337 ▼acomputer▼bc▼2rdamedia
■338 ▼aonline resource▼bcr▼2rdacarrier
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-11, Section: B.
■500 ▼aAdvisors: Browne, Eleanor Committee members: Stark, Harald; de Gouw, Joost; Jiménez, José-Luis; Volkamer, Rainer.
■5021 ▼bPh.D.▼cUniversity of Colorado at Boulder▼d2025.
■520 ▼aAtmospheric aerosols affect the climate by influencing radiative forcing and negatively impact human health as pollutants. Trace gases are crucial in the life cycle of atmospheric aerosols, forming aerosols via new particle formation (NPF) and growing aerosols through condensation of low volatility gases. Gas-phase pollutants can partition onto aerosols, exacerbating negative health effects of aerosol exposure and affecting their ability to undergo long-range transport. However, measurements of trace gases in agricultural regions, which account for a large portion of global land use, are limited. This dissertation presents field measurements of trace gases made in the agricultural Southern Great Plains.In the first study, field measurements of ambient ions made in summer 2016 with an atmospheric pressure interface time-of-flight mass spectrometer are used to characterize trace gases relevant to aerosol formation and growth. A data analysis approach combining binned positive matrix factorization and generalized Kendrick analysis increases the chemical information and temporal resolution available from the dataset. Negative mode ions include clusters of NO3- with highly oxygenated isoprene, monoterpene, and sesquiterpene oxidation products. Sesquiterpene organonitrates dominate the signal of the lowest volatility organic compounds. Positive ion measurements suggest that ammonia and amines are the most abundant bases which may participate in NPF. Building on the first study, the second study presents measurements made with a nitrate anion chemical ionization mass spectrometer (NO3-CIMS) deployed at SGP in May 2023. NO3- CIMS measurements show that the majority of semi-volatile and low volatility compounds are formed by isoprene and monoterpene oxidation but confirm that the lowest volatility species are formed by sesquiterpene oxidation. Organic nitrates contribute a large fraction of aerosol growth precursors.The third study presents NO3-CIMS measurements of atmospheric medium-chain chlorinated paraffins (MCCPs), high production volume industrial chemicals which are toxic and ubiquitous environmental pollutants. Few atmospheric measurements of MCCPs have been reported, and current measurements rely on offline techniques with long sample collection times. The high temporal resolution of the NO3-CIMS is used to investigate the behavior of MCCPs in real time and shows that partitioning between aerosols and the gas phase controls the gas-phase MCCP signal.
■546 ▼aEnglish
■590 ▼aSchool code: 0051
■650 4▼aAtmospheric chemistry
■650 4▼aAnalytical chemistry
■650 4▼aEnvironmental science
■653 ▼aAerosols
■653 ▼aAmbient ions
■653 ▼aChemical ionization mass spectrometry
■653 ▼aChlorinated paraffins
■653 ▼aLow volatility organic compounds
■653 ▼aNew particle formation
■7102 ▼aUniversity of Colorado at Boulder▼bChemistry.▼edegree granting institution.
■7201 ▼aBrowne, Eleanor▼edegree supervisor.
■7730 ▼tDissertations Abstracts International▼g86-11B.
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357040▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
