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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 Characteri...
Field Measurements of Trace Gases in an Agricultural Region: Identification and Characterization of Aerosol Growth Precursors and Organic Pollutants

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260311091509.5
ISBN  
9798315701934
DDC  
551.51
저자명  
Katz, Daniel John
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
키워드  
Chemical ionization mass spectrometry
키워드  
Chlorinated paraffins
키워드  
Low volatility organic compounds
키워드  
New particle formation
기타저자  
University of Colorado at Boulder Chemistry
기본자료저록  
Dissertations Abstracts International. 86-11B.
전자적 위치 및 접속  
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MARC

 008260311s2025        us                                    eng  d
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■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.

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