HR: 16:30h
AN: A24A-02    [Abstracts]
TI: Peroxy and Hydroxyl Radical Measurements During the Spring 2004 Summit Field Campaign
AU: * Sjostedt, S J
EM: ssjostedt@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332-0340 United States
AU: Huey, L G
EM: greg.huey@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332-0340 United States
AU: Tanner, D J
EM: tanner@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332-0340 United States
AU: Peischl, J
EM: jeff.peischl@noaa.gov
AF: Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332-0340 United States
AU: Peischl, J
EM: jeff.peischl@noaa.gov
AF: NOAA Aeronomy Lab, 325 Broadway, Boulder, CO 80305-2290 United States
AU: Chen, G
EM: g.chen@larc.nasa.gov
AF: NASA Langley Research Center, 100 NASA Rd, Hampton, VA 23681-001 United States
AU: Dibb, J E
EM: jack.dibb@unh.edu
AF: University of New Hampshire, 39 College Rd, Durham, NH 03824-3525 United States
AU: Lefer, B
EM: blefer@uh.edu
AF: University of Houston, 4800 Calhoun Rd, Houston, TX 77204-5007 United States
AU: Hutterli, M A
EM: mahut@bas.ac.uk
AF: British Antarctic Survey, High Cross, Madingley Rd, Cambridge, CB3-0ET United Kingdom
AU: Beyersdorf, A J
EM: abeyersd@uci.edu
AF: University of California at Irvine, 570 Rowland Hall, Irvine, CA 92697-2025 United States
AU: Blake, N J
EM: nblake@uci.edu
AF: University of California at Irvine, 570 Rowland Hall, Irvine, CA 92697-2025 United States
AU: Blake, D R
EM: drblake@uci.edu
AF: University of California at Irvine, 570 Rowland Hall, Irvine, CA 92697-2025 United States
AB: Due to increased interest in cryosphere-atmosphere interactions a series of two field campaigns were conducted at Summit, Greenland during Summer 2003 and Spring 2004. During the first campaign we found that observed and predicted levels of peroxy radicals (HO2+RO2) were in excellent agreement. However the measured ratios of HO2+RO2 to OH were consistently lower than predictions. This indicated that we have a good understanding of total radical sources (dominated by ozone photolyis) but that HOx partitioning may be perturbed. The second campaign, mid-March to early-May, allowed us to make measurements when radical production by ozone photolysis was much less important due to low dew points. This allows us to test photochemistry when other HOx precursors such as hydrogen peroxide, formaldehyde and nitrous acid are expected to dominate production. We will present a comparison of observations to model predictions and discuss the impact of the various HOx precursors.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0317 Chemical kinetic and photochemical properties
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005