HR: 10:35h
AN: A22C-02 INVITED     [Abstracts]
TI: Measurements of OH and HO2 + RO2 at Summit Greenland
AU: * Huey, L G
EM: greg.huey@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Dr., Atlanta, GA 30332 United States
AU: Sjostedt, S
EM: sjostedt@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Dr., Atlanta, GA 30332 United States
AU: Tanner, D J
EM: tanner@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Dr., Atlanta, GA 30332 United States
AU: Dibb, J
EM: jack.dibb@unh.edu
AF: University of New Hampshire, Climate Change Research Center, Durham, NH 03824 United States
AU: Chen, G
EM: g.chen_1@nasa.gov
AF: NASA Langley, Atmospheric Sciences, Langley, VA 23665 United States
AU: Lefer, B
EM: lefer@ucar.edu
AF: NCAR, Atmospheric Chemistry Division, Boulder, CO 80303 United States
AU: Peischl, J
EM: jeff.peiscl@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Dr., Atlanta, GA 30332 United States
AU: Hutterli, M
EM: manuel@hwr.arizona.edu
AF: University of Arizona, Dep. of Hydrology and Water Resources, Tuscon, AZ 85721 United States
AU: Blake, N
EM: nblake@uci.edu
AF: University of California - Irvine, Dep. of Chemistry, Irvine, CA 92602 United States
AU: Blake, D
EM: dblake@orion.oac.uci.edu
AF: University of California - Irvine, Dep. of Chemistry, Irvine, CA 92602 United States
AU: Beyersdorf, A
EM: abeyersd@uci.edu
AF: University of California - Irvine, Dep. of Chemistry, Irvine, CA 92602 United States
AU: Ryerson, T
EM: tryerson@al.noaa.gov
AF: NOAA, Aeronomy Laboratory, Boulder, CO 80303 United States
AB: A photochemistry experiment was conducted at Summit, Greenland during summer 2003 . Measurements of OH, HO2 + RO2, NO, O3, H2O, HONO, CH2O, HOOH, j values, soluble bromide, and a large suite of hydrocarbons were performed a few meters above the snowpack. Noon time values of OH and HO2 + RO2 were observed to range from 5-20 E6 and 2-5 x E8 molec. cm-3, respectively. For most conditions the HO2 + RO2 values were within 20% of calculations from a photochemical box model. However, the OH levels were consistently higher than predicted especially during times of high winds and blowing snow. These results suggest that there is a an significant mechanism for converting HO2 to OH in this environment that is unaccounted for at the present. We hypothesize that halogen chemistry may help account for this and other observations in the Summit environment.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0322 Constituent sources and sinks
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting