SEV Hydrocarbon Emissions, Absorption Spectra, and Future Work

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SEV Hydrocarbon Emissions, Absorption Spectra,
and Future Work
Workers Court Strong Jose D Fuentes Bruce P
Hayden Daniel Wang
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Air sampling methodology Sevilleta National
Wildlife Refuge
Emissions from foliage using

• A gas exchange system
• Electropolished canisters
• Mass flow controllers

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Air sampling methodology Sevilleta National
Wildlife Refuge
Hydrocarbon concentration gradients

• Samples taken at 0.05, 0.5, 1.2, 2.0, and 3.0 m
• Samples stored in electropolished canisters

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Air sampling methodology Sevilleta Field Station
Emissions from foliage using

• A gas exchange system
• Electropolished canisters
• Mass flow controllers

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Preliminary data analyses
Data viewing on computer monitor with a size 3X
T-shirt!
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Hydrocarbons produced by Chihuahuan desert plants
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Irradiance absorption spectra
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Absorption Spectrum for 3-hexen-1-ol(Z)
Window
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Absorption Spectrum for ?-pinene
Window
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Absorption Spectrum for Benzaldehyde
Window
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Absorption Spectrum for Beta-Pinene
Window
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Absorption Spectrum for Camphene
Window
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Absorption Spectrum for Cyclohexanone
Window
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Absorption Spectrum for Hexanal
Window
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Absorption Spectrum for Isoprene
Window
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Absorption Spectrum for Limonene
Window
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Absorption Spectrum for Nonanal
Window
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Absorption Spectrum for Octanal
Window
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Laria (PMD 10)
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Courtyard II
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Snakeweed
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Benzaldehyde
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Cyclohexanone
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Acetaldehyde
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Ethanol
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Future field and theoretical work
A. Hydrocarbon emissions from Laria vegetation

• Define hydrocarbon amounts in leaf tissue
• Establish diurnal emission rates
• Derive seasonal emissions rates
• Develop hydrocarbon emission model

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Future field and theoretical work
B. Ecosystem-level hydrocarbon fluxes

• Study hydrocarbon fluxes during selected periods
  of the growing season
• Determine amounts of hydrocarbons reacted in the
  atmospheric boundary layer
• Quantify reaction products and yields from
  hydrocarbon oxidation processes

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Future field and theoretical work
C. Spatial distribution of hydrocarbons

• Define diurnal distribution of hydrocarbons in
  the atmospheric boundary layer
• Determine the amounts of hydrocarbons leaving the
  atmospheric boundary layer

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Future field and theoretical work
D. Thermal energy trapping by hydrocarbons

• Develop a one-dimension model to study the
  thermal energy trapping by unreacted hydrocarbons
• Investigate the shifts in the local energy
  balance due to the presence of creosote
  vegetation (comparative modeling studies for
  creosote and grass lands)

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