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Linking the Land Biosphere with Atmo...

Zheng, Yiqi.

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Linking the Land Biosphere with Atmospheric Chemistry and Climate: Plant Volatile Emissions and Organic Aerosol.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Linking the Land Biosphere with Atmospheric Chemistry and Climate: Plant Volatile Emissions and Organic Aerosol./
Author:	Zheng, Yiqi.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	209 p.
Notes:	Source: Dissertations Abstracts International, Volume: 80-09, Section: B.
Contained By:	Dissertations Abstracts International80-09B.
Subject:	Atmospheric Chemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13851109
ISBN:	9780438981508

Linking the Land Biosphere with Atmospheric Chemistry and Climate: Plant Volatile Emissions and Organic Aerosol.
Zheng, Yiqi.

Linking the Land Biosphere with Atmospheric Chemistry and Climate: Plant Volatile Emissions and Organic Aerosol. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 209 p.

Source: Dissertations Abstracts International, Volume: 80-09, Section: B.

Thesis (Ph.D.)--Yale University, 2018.

This item must not be added to any third party search indexes.

Volatile organic compounds (VOCs) emitted from terrestrial vegetation play a key role in atmospheric chemistry and climate. In turn, the emission and oxidation of VOCs are sensitive to atmospheric pollutants and climate change. By integrating multiple platform observations and global chemistry-climate models, this thesis quantitatively improves the current understanding of the interactive relationships between photosynthesis, biogenic VOC emissions, their oxidation products, anthropogenic pollutants and climate. Isoprene is the dominant biogenic VOC species but its direct observation is not available at large spatiotemporal scales. This thesis first examines the variability of isoprene emission and its two indirect indicators: photosynthesis, which supports isoprene synthesis, and formaldehyde (HCHO), a high-yield product of atmospheric isoprene oxidation. Satellite observations show that monthly photosynthesis and HCHO columns are decoupled (r=-0.03) in the summertime southeast US. Interpretation of the observed patterns using a global chemistry-climate model NASA GISS ModelE2-YIBs embedded with three different isoprene algorithms suggests that water availability is an important driver of isoprene emission at seasonal to interannual time scales. At local scale, impacts of water deficit on the three interlinked variables (photosynthesis, isoprene emission and HCHO) have been studied at the Missouri Ozarks forest during a 20-day mild drought in summer 2011 and a 3-month severe drought in summer 2012. Observed isoprene emissions show opposite responses to the short- and long-term droughts, while photosynthesis is substantially reduced in both cases. The remote-sensed HCHO columns are not quantitatively reliable to detect drought impacts on isoprene emission. Then, this thesis develops a semi-empirical Fluorescence-based Isoprene emission Model (FIM), in which all input data can be acquired from satellite. FIM well captures the flux tower measured isoprene emissions at four Northern Hemisphere extratropical locations at both daily (r2=0.88) and monthly (r2=0.94) time scales. Compared to an existing empirical isoprene emission model MEGAN, FIM shows a similar seasonal cycle and interannual variability. FIM is the first attempt to use satellite solar-induced fluorescence to reconstruct biogenic isoprene emission, and is an important independent supplement to current commonly used methods. Finally, this thesis investigates the formation of secondary organic aerosol (SOA). Globally, SOA is mostly formed from biogenic VOC emissions, but can be modified by anthropogenic pollutants, e.g. nitrogen oxides (NO x=NO+NO2). The SOA scheme in the global chemistry-climate model CAM4-Chem has been updated by implementing a 4-product Volatility Basis Set (VBS) scheme, including NOx-dependent yields and an aging parameterization. Compared to surface and aircraft observations, the VBS with aging scheme improves simulated spatial distribution and secondary-to-primary ratio in total organic matter. Limited SOA reduction is found in response to a 50% reduction in anthropogenic NOx emissions due to the buffering in different chemical pathways.

ISBN: 9780438981508Subjects--Topical Terms:

1669583
Atmospheric Chemistry.

Linking the Land Biosphere with Atmospheric Chemistry and Climate: Plant Volatile Emissions and Organic Aerosol.
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245 1 0 $a Linking the Land Biosphere with Atmospheric Chemistry and Climate: Plant Volatile Emissions and Organic Aerosol.
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300 $a 209 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-09, Section: B.
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500 $a Advisor: Smith, Ronald B.
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506 $a This item must not be added to any third party search indexes.
506 $a This item must not be sold to any third party vendors.
520 $a Volatile organic compounds (VOCs) emitted from terrestrial vegetation play a key role in atmospheric chemistry and climate. In turn, the emission and oxidation of VOCs are sensitive to atmospheric pollutants and climate change. By integrating multiple platform observations and global chemistry-climate models, this thesis quantitatively improves the current understanding of the interactive relationships between photosynthesis, biogenic VOC emissions, their oxidation products, anthropogenic pollutants and climate. Isoprene is the dominant biogenic VOC species but its direct observation is not available at large spatiotemporal scales. This thesis first examines the variability of isoprene emission and its two indirect indicators: photosynthesis, which supports isoprene synthesis, and formaldehyde (HCHO), a high-yield product of atmospheric isoprene oxidation. Satellite observations show that monthly photosynthesis and HCHO columns are decoupled (r=-0.03) in the summertime southeast US. Interpretation of the observed patterns using a global chemistry-climate model NASA GISS ModelE2-YIBs embedded with three different isoprene algorithms suggests that water availability is an important driver of isoprene emission at seasonal to interannual time scales. At local scale, impacts of water deficit on the three interlinked variables (photosynthesis, isoprene emission and HCHO) have been studied at the Missouri Ozarks forest during a 20-day mild drought in summer 2011 and a 3-month severe drought in summer 2012. Observed isoprene emissions show opposite responses to the short- and long-term droughts, while photosynthesis is substantially reduced in both cases. The remote-sensed HCHO columns are not quantitatively reliable to detect drought impacts on isoprene emission. Then, this thesis develops a semi-empirical Fluorescence-based Isoprene emission Model (FIM), in which all input data can be acquired from satellite. FIM well captures the flux tower measured isoprene emissions at four Northern Hemisphere extratropical locations at both daily (r2=0.88) and monthly (r2=0.94) time scales. Compared to an existing empirical isoprene emission model MEGAN, FIM shows a similar seasonal cycle and interannual variability. FIM is the first attempt to use satellite solar-induced fluorescence to reconstruct biogenic isoprene emission, and is an important independent supplement to current commonly used methods. Finally, this thesis investigates the formation of secondary organic aerosol (SOA). Globally, SOA is mostly formed from biogenic VOC emissions, but can be modified by anthropogenic pollutants, e.g. nitrogen oxides (NO x=NO+NO2). The SOA scheme in the global chemistry-climate model CAM4-Chem has been updated by implementing a 4-product Volatility Basis Set (VBS) scheme, including NOx-dependent yields and an aging parameterization. Compared to surface and aircraft observations, the VBS with aging scheme improves simulated spatial distribution and secondary-to-primary ratio in total organic matter. Limited SOA reduction is found in response to a 50% reduction in anthropogenic NOx emissions due to the buffering in different chemical pathways.
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