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Hydroxyl and Hydroperoxyyl Radicals: A Model Re-Assessment, Measurements in a Ponderosa Pine Forest, and Indoor-Outdoor Comparison
Hydroxyl and Hydroperoxyyl Radicals: A Model Re-Assessment, Measurements in a Ponderosa Pi...
Hydroxyl and Hydroperoxyyl Radicals: A Model Re-Assessment, Measurements in a Ponderosa Pine Forest, and Indoor-Outdoor Comparison

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자료유형  
 학위논문 서양
최종처리일시  
20250211153021
ISBN  
9798346532569
DDC  
551.5
저자명  
Price, Paige McKenzie.
서명/저자  
Hydroxyl and Hydroperoxyyl Radicals: A Model Re-Assessment, Measurements in a Ponderosa Pine Forest, and Indoor-Outdoor Comparison
발행사항  
[Sl] : Indiana University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
160 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
주기사항  
Advisor: Stevens, Philip S.
학위논문주기  
Thesis (Ph.D.)--Indiana University, 2024.
초록/해제  
요약The hydroxyl radical (OH) controls the lifetime of many trace gases in the atmosphere and initiates the chemistry that can lead to the production of secondary pollutants harmful to human health and the environment such as aerosols and tropospheric ozone. The OH radical oxidizes volatile organic compounds (VOCs) to propagate a radical cycle which forms organic peroxy radicals (RO2) that react with nitric oxide (NO) to form hydroperoxyl radicals (HO2) which react with NO to re-form OH. Due to the short lifetime of these radicals, they can be very difficult to measure. Yet, accurate measurements of OH and HO2 are necessary in order to test the understanding of radical chemistry in models. Historically, a model-measurement discrepancy has driven the study of the OH radical, especially in rural areas. However, an analysis presented here demonstrates that the model understanding of OH chemistry generally reproduces measured concentrations. This is in contrast to the variable model-measurement agreement for HO2.One environment where HO2 has been underpredicted by models is in the ponderosa pine forest. In this forest, 2-methyl-3-buten-2-ol (MBO) is the dominant biogenic VOC (BVOC) released. Here, a missing HO2 source is most likely attributed to the fate of MBO and oxidized MBO products which are largely understudied. Additionally, when sesquiterpenes are added as a model constraint the model first-order lifetime needed to be decreased from 24 hours to 30 minutes in order for the modeled OH reactivity to reproduce the measured OH reactivity. This result revealed that sesquiterpenes are also an understudied class of chemicals with respect to their atmospheric fate.Finally, similar to the outdoor environment, HOx (OH + HO2) radicals can be responsible for generating indoor air pollutants such as O3 and secondary organic aerosols which are harmful to human health. For the first time, the influence of outdoor radicals on the unperturbed indoor environment is evaluated through concurrent measurements of HO2. Initial results reveal that the lifetime of HO2 outdoors is most likely too short for an indoor influence. However, correlations of NO and O3 indicate potential of outdoor air transport inside to influence radical chemistry indoors.
일반주제명  
Atmospheric chemistry
일반주제명  
Environmental science
일반주제명  
Atmospheric sciences
키워드  
Hydroperoxyl radicals
키워드  
Hydroxyl radical
키워드  
Ponderosa pine
키워드  
Nitric oxide
기타저자  
Indiana University Environmental Science
기본자료저록  
Dissertations Abstracts International. 86-05B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■020    ▼a9798346532569
■035    ▼a(MiAaPQ)AAI31632080
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a551.5
■1001  ▼aPrice,  Paige  McKenzie.
■24510▼aHydroxyl  and  Hydroperoxyyl  Radicals:  A  Model  Re-Assessment,  Measurements  in  a  Ponderosa  Pine  Forest,  and  Indoor-Outdoor  Comparison
■260    ▼a[Sl]▼bIndiana  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a160  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-05,  Section:  B.
■500    ▼aAdvisor:  Stevens,  Philip  S.
■5021  ▼aThesis  (Ph.D.)--Indiana  University,  2024.
■520    ▼aThe  hydroxyl  radical  (OH)  controls  the  lifetime  of  many  trace  gases  in  the  atmosphere  and  initiates  the  chemistry  that  can  lead  to  the  production  of  secondary  pollutants  harmful  to  human  health  and  the  environment  such  as  aerosols  and  tropospheric  ozone.  The  OH  radical  oxidizes  volatile  organic  compounds  (VOCs)  to  propagate  a  radical  cycle  which  forms  organic  peroxy  radicals  (RO2)  that  react  with  nitric  oxide  (NO)  to  form  hydroperoxyl  radicals  (HO2)  which  react  with  NO  to  re-form  OH.  Due  to  the  short  lifetime  of  these  radicals,  they  can  be  very  difficult  to  measure.  Yet,  accurate  measurements  of  OH  and  HO2  are  necessary  in  order  to  test  the  understanding  of  radical  chemistry  in  models.  Historically,  a  model-measurement  discrepancy  has  driven  the  study  of  the  OH  radical,  especially  in  rural  areas.  However,  an  analysis  presented  here  demonstrates  that  the  model  understanding  of  OH  chemistry  generally  reproduces  measured  concentrations.  This  is  in  contrast  to  the  variable  model-measurement  agreement  for  HO2.One  environment  where  HO2  has  been  underpredicted  by  models  is  in  the  ponderosa  pine  forest.  In  this  forest,  2-methyl-3-buten-2-ol  (MBO)  is  the  dominant  biogenic  VOC  (BVOC)  released.  Here,  a  missing  HO2  source  is  most  likely  attributed  to  the  fate  of  MBO  and  oxidized  MBO  products  which  are  largely  understudied.  Additionally,  when  sesquiterpenes  are  added  as  a  model  constraint  the  model  first-order  lifetime  needed  to  be  decreased  from  24  hours  to  30  minutes  in  order  for  the  modeled  OH  reactivity  to  reproduce  the  measured  OH  reactivity.  This  result  revealed  that  sesquiterpenes  are  also  an  understudied  class  of  chemicals  with  respect  to  their  atmospheric  fate.Finally,  similar  to  the  outdoor  environment,  HOx  (OH  +  HO2)  radicals  can  be  responsible  for  generating  indoor  air  pollutants  such  as  O3  and  secondary  organic  aerosols  which  are  harmful  to  human  health.  For  the  first  time,  the  influence  of  outdoor  radicals  on  the  unperturbed  indoor  environment  is  evaluated  through  concurrent  measurements  of  HO2.  Initial  results  reveal  that  the  lifetime  of  HO2  outdoors  is  most  likely  too  short  for  an  indoor  influence.  However,  correlations  of  NO  and  O3  indicate  potential  of  outdoor  air  transport  inside  to  influence  radical  chemistry  indoors.
■590    ▼aSchool  code:  0093.
■650  4▼aAtmospheric  chemistry
■650  4▼aEnvironmental  science
■650  4▼aAtmospheric  sciences
■653    ▼aHydroperoxyl  radicals
■653    ▼aHydroxyl  radical
■653    ▼aPonderosa  pine
■653    ▼aNitric  oxide
■690    ▼a0371
■690    ▼a0768
■690    ▼a0725
■71020▼aIndiana  University▼bEnvironmental  Science.
■7730  ▼tDissertations  Abstracts  International▼g86-05B.
■790    ▼a0093
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164602▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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