HR: 0800h
AN: A51C-0064    [Abstracts]
TI: Peroxyacetic Acid Ubiquitous During ICARTT (Summer 2004)
AU: * Crounse, J D
EM: crounjd@caltech.edu
AF: California Institute of Technology, MC 150-21 1200 E California Blvd, Pasadena, CA 91125 United States
AU: Kwan, A
EM: kwan@caltech.edu
AF: California Institute of Technology, MC 150-21 1200 E California Blvd, Pasadena, CA 91125 United States
AU: Wennberg, P
EM: wennberg@gps.caltech.edu
AF: California Institute of Technology, MC 150-21 1200 E California Blvd, Pasadena, CA 91125 United States
AU: O'Sullivan, D
EM: osulliva@usna.edu
AF: United States Navel Academy, Chemistry Department 572 Holloway Rd, Annapolis, MD 21402 United States
AU: Shen, H
EM: hshen@gso.uri.edu
AF: University of Rhode Island, Center for Atmospheric Chemistry Studies Graduate School of Oceanography South Ferry Rd., Narragansett, RI 02882-1197 United States
AU: Heikes, B
EM: bheikes@gso.uri.edu
AF: University of Rhode Island, Center for Atmospheric Chemistry Studies Graduate School of Oceanography South Ferry Rd., Narragansett, RI 02882-1197 United States
AU: Pippin, M
EM: m.r.pippin@larc.nasa.gov
AF: NASA Langley Research Center, Atmospheric Sciences, Hampton, VA 23681 United States
AU: Crawford, J
EM: James.H.Crawford@nasa.gov
AF: NASA Langley Research Center, Atmospheric Sciences, Hampton, VA 23681 United States
AB: Observations of peroxyacetic acid (PAA) aboard the NASA DC-8 reveal significant levels of this molecule throughout the troposphere. Constrained box-model simulations significantly underestimate the amount of PAA, particularly in the upper troposphere (UT). This implies either a large unaccounted for source of PAA or an error in the assumed lifetime of PAA. This lifetime is thought to be governed by reaction with the hydroxyl radical. The rate coefficient for this reaction has, however, only been estimated, as no laboratory measurements have been reported. Using the box model, we investigate the sensitivity of calculated PAA to assumptions about the rate of the reaction of OH with PAA. Alternatively, we calculate the magnitude of the additional source required to account for the observed PAA mixing ratios. Implications to the chemistry of the UT will be discussed.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0317 Chemical kinetic and photochemical properties
DE: 0322 Constituent sources and sinks
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005