HR: 0800h
AN: A11B-0042    [Abstracts]
TI: Measurement of Pernitric Acid, Nitric Acid and Sulfur Dioxide at the South Pole during ANTCI 2003
AU: * Sjostedt, S J
EM: ssjostedt@eas.gatech.edu
AF: Georgia Institute of Technology Dept. of Earth and Atmospheric Sciences, 311 Ferst Dr., Atlanta, GA 30332
AU: Tanner, D J
EM: tanner@eas.gatech.edu
AF: Georgia Institute of Technology Dept. of Earth and Atmospheric Sciences, 311 Ferst Dr., Atlanta, GA 30332
AU: Dibb, J E
EM: jack.dibb@unh.edu
AF: University of New Hampshire EOS, 39 College Rd, Durham, NH 03824
AU: Buhr, M
EM: marty@sonomatech.com
AF: Sonoma Technology, Inc, 607 Virginia St, Golden, CO 80403
AU: Warshawsky, M
EM: mwarshawsky@azeotech.com
AF: Georgia Institute of Technology Dept. of Earth and Atmospheric Sciences, 311 Ferst Dr., Atlanta, GA 30332
AU: Davis, D
EM: doug.davis@eas.gatech.edu
AF: Georgia Institute of Technology Dept. of Earth and Atmospheric Sciences, 311 Ferst Dr., Atlanta, GA 30332
AU: Chen, G
EM: g.chen@larc.nasa,gov
AF: NASA Langley Research Center, 100 NASA Rd., Hampton, VA 23681
AU: Mauldin, R L
EM: mauldin@ncar.edu
AF: National Center for Atmospheric Research, 1850 Table Mesa Dr., Boulder, CO 80305
AU: Eisele, F
EM: eisele@ncar.ucar.edu
AF: National Center for Atmospheric Research, 1850 Table Mesa Dr., Boulder, CO 80305
AU: Arimoto, R
EM: arimoto@cemrc.nmsu.edu
AF: Carlsbad Environmental Monitoring & Research Center, 1400 University Dr., Carlsbad, NM 88220
AU: Huey, L G
EM: greg.huey@eas.gatech.edu
AF: Georgia Institute of Technology Dept. of Earth and Atmospheric Sciences, 311 Ferst Dr., Atlanta, GA 30332
AB: Sulfur dioxide, pernitric and nitric acid were measured with a chemical ionization mass spectrometer (CIMS) from the Atmospheric Research Observatory during the ANTCI 2003 austral summer field campaign. Preliminary mean mixing ratios of HNO4 (28 pptv) are comparable to values observed during ISCAT 2000, while the HNO3 mixing ratios (89 pptv) are elevated by a factor of 4. The mean SO2 mixing ratio (10 pptv ) displayed little variation throughout the mission. While the mean values for temperature, dewpoint and ozone between the two field missions are comparable, the NOx mixing ratios were ~2.5 higher during the 2003 ANTCI campaign. The NOx increase is mirrored in the HNO3 mixing ratio but is not as apparent in the HNO4 mixing ratio. Two probable causes for the increase of the HNO3/HNO4 ratio have been identified: 1) Advection of enhanced HNO3 mixing ratios to the South Pole 2) An increase in local production of HNO3 at the South Pole due to elevated NOx concentrations. The relative importance of each will be examined with a simple 0-D photochemical box model.
DE: 0365 Troposphere--composition and chemistry
DE: 0394 Instruments and techniques
DE: 0399 General or miscellaneous
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting