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Modeling the Response of Isoprene Emissions from Terrestrial Ecosystems to Drought and Heatwaves
Modeling the Response of Isoprene Emissions from Terrestrial Ecosystems to Drought and Hea...
Modeling the Response of Isoprene Emissions from Terrestrial Ecosystems to Drought and Heatwaves

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152829
ISBN  
9798384499305
DDC  
551.5
저자명  
Wang, Hui.
서명/저자  
Modeling the Response of Isoprene Emissions from Terrestrial Ecosystems to Drought and Heatwaves
발행사항  
[Sl] : University of California, Irvine, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
168 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-04, Section: B.
주기사항  
Advisor: Guenther, Alex.
학위논문주기  
Thesis (Ph.D.)--University of California, Irvine, 2024.
초록/해제  
요약The heatwave and drought stresses induced by rapid climate change can alter the emission of isoprene from terrestrial ecosystems. This, in turn, affects climate and air quality by modifying photochemistry and forming secondary organic aerosols. Understanding the complex interactions and feedback loops between climate and isoprene emissions is a challenging yet urgent task. This study integrates laboratory experiments and in-situ measurements to investigate and model these impacts within the Model of Emissions of Gases and Aerosols from Nature (MEGAN).In the first chapter, an empirical algorithm was developed to simulate drought effects on isoprene emissions, revealing an 11% global decrease in isoprene in 2012 due to drought. This algorithm improved the agreement between model simulations and satellite formaldehyde observations during droughts, as formaldehyde is widely used as a proxy for isoprene. However, its performance was limited by the model's ability to accurately capture drought severity.The second and third chapters focus on Arctic ecosystems, where rapid warming is accelerating isoprene emissions. The second chapter characterizes the temperature response of Arctic willows, finding that their hourly temperature response curve is similar to that of temperate plants. Isoprene emissions increase with rising temperature, reaching an optimal level before declining due to enzyme denaturation. Additionally, the isoprene capacity of willows could increase rapidly with rising ambient temperatures from the previous day. During heatwaves, Arctic willows exhibited a 66% higher isoprene emission when using a modified algorithm based on my measurements.The third chapter investigates sedges, another major Arctic isoprene emitter, and finds that their temperature response is notably stronger compared to other isoprene emitters. Integrating these findings into MEGAN improved the capacity of model to reproduce observations. The omission of these strong temperature responses from both willows and sedges led to a 20% underestimation of isoprene emissions in high-latitude regions between 2000 and 2009, and a 55% underestimation of long-term trends from 1960 to 2009. Therefore, rapid warming in the Arctic could significantly increase isoprene emissions, altering local chemistry and impacting the climate.
일반주제명  
Atmospheric chemistry
일반주제명  
Environmental science
일반주제명  
Climate change
일반주제명  
Atmospheric sciences
키워드  
Heatwaves
키워드  
Drought
키워드  
Isoprene emissions
키워드  
Formaldehyde
키워드  
Arctic willows
기타저자  
University of California, Irvine Earth System Science
기본자료저록  
Dissertations Abstracts International. 86-04B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■035    ▼a(MiAaPQ)AAI31560363
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a551.5
■1001  ▼aWang,  Hui.
■24510▼aModeling  the  Response  of  Isoprene  Emissions  from  Terrestrial  Ecosystems  to  Drought  and  Heatwaves
■260    ▼a[Sl]▼bUniversity  of  California,  Irvine▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a168  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-04,  Section:  B.
■500    ▼aAdvisor:  Guenther,  Alex.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Irvine,  2024.
■520    ▼aThe  heatwave  and  drought  stresses  induced  by  rapid  climate  change  can  alter  the  emission  of  isoprene  from  terrestrial  ecosystems.  This,  in  turn,  affects  climate  and  air  quality  by  modifying  photochemistry  and  forming  secondary  organic  aerosols.  Understanding  the  complex  interactions  and  feedback  loops  between  climate  and  isoprene  emissions  is  a  challenging  yet  urgent  task.  This  study  integrates  laboratory  experiments  and  in-situ  measurements  to  investigate  and  model  these  impacts  within  the  Model  of  Emissions  of  Gases  and  Aerosols  from  Nature  (MEGAN).In  the  first  chapter,  an  empirical  algorithm  was  developed  to  simulate  drought  effects  on  isoprene  emissions,  revealing  an  11%  global  decrease  in  isoprene  in  2012  due  to  drought.  This  algorithm  improved  the  agreement  between  model  simulations  and  satellite  formaldehyde  observations  during  droughts,  as  formaldehyde  is  widely  used  as  a  proxy  for  isoprene.  However,  its  performance  was  limited  by  the  model's  ability  to  accurately  capture  drought  severity.The  second  and  third  chapters  focus  on  Arctic  ecosystems,  where  rapid  warming  is  accelerating  isoprene  emissions.  The  second  chapter  characterizes  the  temperature  response  of  Arctic  willows,  finding  that  their  hourly  temperature  response  curve  is  similar  to  that  of  temperate  plants.  Isoprene  emissions  increase  with  rising  temperature,  reaching  an  optimal  level  before  declining  due  to  enzyme  denaturation.  Additionally,  the  isoprene  capacity  of  willows  could  increase  rapidly  with  rising  ambient  temperatures  from  the  previous  day.  During  heatwaves,  Arctic  willows  exhibited  a  66%  higher  isoprene  emission  when  using  a  modified  algorithm  based  on  my  measurements.The  third  chapter  investigates  sedges,  another  major  Arctic  isoprene  emitter,  and  finds  that  their  temperature  response  is  notably  stronger  compared  to  other  isoprene  emitters.  Integrating  these  findings  into  MEGAN  improved  the  capacity  of  model  to  reproduce  observations.  The  omission  of  these  strong  temperature  responses  from  both  willows  and  sedges  led  to  a  20%  underestimation  of  isoprene  emissions  in  high-latitude  regions  between  2000  and  2009,  and  a  55%  underestimation  of  long-term  trends  from  1960  to  2009.  Therefore,  rapid  warming  in  the  Arctic  could  significantly  increase  isoprene  emissions,  altering  local  chemistry  and  impacting  the  climate.
■590    ▼aSchool  code:  0030.
■650  4▼aAtmospheric  chemistry
■650  4▼aEnvironmental  science
■650  4▼aClimate  change
■650  4▼aAtmospheric  sciences
■653    ▼aHeatwaves
■653    ▼aDrought
■653    ▼aIsoprene  emissions
■653    ▼aFormaldehyde
■653    ▼aArctic  willows
■690    ▼a0371
■690    ▼a0768
■690    ▼a0404
■690    ▼a0725
■71020▼aUniversity  of  California,  Irvine▼bEarth  System  Science.
■7730  ▼tDissertations  Abstracts  International▼g86-04B.
■790    ▼a0030
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164075▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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