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Download fileModeling the Current and Future Roles of Particulate Organic Nitrates in the Southeastern United States
dataset
posted on 2015-12-15, 00:00 authored by Havala O. T. Pye, Deborah
J. Luecken, Lu Xu, Christopher M. Boyd, Nga L. Ng, Kirk R. Baker, Benjamin R. Ayres, Jesse O. Bash, Karsten Baumann, William P. L. Carter, Eric Edgerton, Juliane
L. Fry, William T. Hutzell, Donna B. Schwede, Paul B. ShepsonOrganic
nitrates are an important aerosol constituent in locations
where biogenic hydrocarbon emissions mix with anthropogenic NOx sources. While regional and global chemical
transport models may include a representation of organic aerosol from
monoterpene reactions with nitrate radicals (the primary source of
particle-phase organic nitrates in the Southeast United States), secondary
organic aerosol (SOA) models can underestimate yields. Furthermore,
SOA parametrizations do not explicitly take into account organic nitrate
compounds produced in the gas phase. In this work, we developed a
coupled gas and aerosol system to describe the formation and subsequent
aerosol-phase partitioning of organic nitrates from isoprene and monoterpenes
with a focus on the Southeast United States. The concentrations of
organic aerosol and gas-phase organic nitrates were improved when
particulate organic nitrates were assumed to undergo rapid (τ
= 3 h) pseudohydrolysis resulting in nitric acid and nonvolatile secondary
organic aerosol. In addition, up to 60% of less oxidized-oxygenated
organic aerosol (LO-OOA) could be accounted for via organic nitrate
mediated chemistry during the Southern Oxidants and Aerosol Study
(SOAS). A 25% reduction in nitrogen oxide (NO + NO2) emissions
was predicted to cause a 9% reduction in organic aerosol for June
2013 SOAS conditions at Centreville, Alabama.
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Categories
- Biochemistry
- Space Science
- Microbiology
- Molecular Biology
- Environmental Sciences not elsewhere classified
- Chemical Sciences not elsewhere classified
- Astronomical and Space Sciences not elsewhere classified
- Biological Sciences not elsewhere classified
- Developmental Biology
- Inorganic Chemistry
- Infectious Diseases
Keywords
Particulate Organic Nitrateschemical transport modelsanthropogenic NOx sourcesnitric acidnitrate radicalsAerosol Studyaerosol constituentSOA parametrizationsSouthern OxidantsFuture Rolesgas phaseSoutheastern United StatesOrganic nitratesnitrate compounds3 hbiogenic hydrocarbon emissions mixnitrogen oxideJune 2013 SOAS conditionsaerosol systemSoutheast United Statesmonoterpene reactions