Simulating the Effects of Hydroclimate Stress on BVOC-Chemistry-Climate Interactions in NASA GISS ModelE

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dc.contributor.advisorWang, Yuxuan
dc.contributor.committeeMemberJiang, Xun
dc.contributor.committeeMemberFlynn, James H., III
dc.contributor.committeeMemberBauer, Susanne E.
dc.contributor.committeeMemberTsigaridis, Kostas
dc.creatorKlovenski, Elizabeth Renee
dc.creator.orcid0000-0003-1747-415X
dc.date.accessioned2023-05-28T16:26:16Z
dc.date.createdAugust 2022
dc.date.issued2022-07-08
dc.date.updated2023-05-28T16:26:17Z
dc.description.abstractDrought is a hydroclimatic extreme that causes perturbations to the terrestrial biosphere which causes biosphere-atmosphere feedbacks. Drought acts as a stressor on vegetation, which causes a unique biogenic volatile organic carbon (BVOC) emission response during severe or prolonged drought. In the first chapter, we introduce the concept of drought and the four main types: meteorological, agricultural, hydrological, and socioeconomic. Then we expand upon how drought affects vegetation on the physiological level and how drought stress impacts vegetative isoprene emissions and their impact on atmospheric composition and climate, as isoprene is the dominantly emitted BVOC and is a precursor to ozone (O3) and secondary organic aerosols (SOA). In the second chapter, the implementation of isoprene drought stress into the Model of Emissions and Gases and Aerosols from Nature (MEGAN) module in the NASA GISS ModelE, an earth system model, is described along with validation of isoprene emissions during the 2012 drought at the Missouri Ozarks Ameriflux site. In the third chapter, the development of a model tuned isoprene drought stress parameterization is described along with validation of O3, PM2.5 and HCHO tropospheric columns compared to observations during drought periods. We found the isoprene drought stress parameterization reduced the normalized mean bias in tropospheric HCHO column, a proxy for isoprene emissions, by ~ 19.3% in the southeast U.S. during the 2007 drought and ~ 15.3% during the 2011 drought. In the fourth chapter, the ModelE tuned isoprene drought stress ( ) parameterization is applied in free-running experiments to simulate the historic 1950s decadal drought that occurred from 1948-1957 and in present-day experiments from 2003-2013. It was found the inclusion of isoprene drought stress in both the historic and present-day experiments reduced the averaged precipitation in the warm season (APR-SEP) and reduced the frequency of “rainy-days”. With decreasing isoprene emissions and decreasing SOA during drought, its theorized a biosphere- atmosphere feedback is causing reduced precipitation during the warm season through BVOC- drought-aerosol-climate interactions. We speculate that this feedback during our simulations is exacerbating the already existing precipitation deficit during drought periods.
dc.description.departmentEarth and Atmospheric Sciences, Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.citationPortions of this document appear in: Klovenski, Elizabeth, Yuxuan Wang, Susanne Bauer, Kostas Tsigaridis, Gregory Faluvegi, Nancy Kiang, Igor Aleinov, Xiaoyan Jiang, and Alex Guenther. "Interactive Biogenic Emissions and Drought Stress Effects on Biosphere-Atmosphere-Chemistry in NASA GISS ModelE." In AGU Fall Meeting Abstracts, vol. 2021, pp. B15E-1480. 2021.
dc.identifier.urihttps://hdl.handle.net/10657/14299
dc.language.isoeng
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. UH Libraries has secured permission to reproduce any and all previously published materials contained in the work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectDrought
dc.subjectBvoc
dc.subjectOzone
dc.subjectAerosol
dc.subjectChemistry
dc.subjectClimate
dc.subjectInteractions
dc.titleSimulating the Effects of Hydroclimate Stress on BVOC-Chemistry-Climate Interactions in NASA GISS ModelE
dc.type.dcmiText
dc.type.genreThesis
dcterms.accessRightsThe full text of this item is not available at this time because the student has placed this item under an embargo for a period of time. The Libraries are not authorized to provide a copy of this work during the embargo period.
local.embargo.lift2024-08-01
local.embargo.terms2024-08-01
thesis.degree.collegeCollege of Natural Sciences and Mathematics
thesis.degree.departmentEarth and Atmospheric Sciences, Department of
thesis.degree.disciplineAtmospheric Sciences
thesis.degree.grantorUniversity of Houston
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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