HR: 11:05h
AN: A22A-03    [Abstracts]
TI: Measurements of Active Chlorine in the Antarctic Ozone Hole: 1986 to 2005
AU: * Solomon, P
EM: Philip.Solomon@stonybrook.edu
AF: State University of New York, Physics and Astronomy Department, Stony Brook, NY 11794-3800 United States
AU: Barrett, J
EM: James.Barrett@stonybrook.edu
AF: State University of New York, Physics and Astronomy Department, Stony Brook, NY 11794-3800 United States
AU: Connor, B
EM: b.connor@niwa.scott.aq
AF: National Institute of Water and Atmospheric Research, Private Bag 50061, Omakau, Lauder, Central Otago, 9182 New Zealand
AU: Mooney, T
EM: Thomas.Mooney@stonybrook.edu
AF: State University of New York, Physics and Astronomy Department, Stony Brook, NY 11794-3800 United States
AU: Parrish, A
EM: parrish@astro.umass.edu
AF: University of Massachusetts, Department of Astronomy LGRT-B 619E, Amherst, MA 01003-9305 United States
AB: We will present and compare ground-based microwave measurements of stratospheric chlorine monoxide, ClO, from 1986, 1987 and 1996 through 2005 obtained from McMurdo and Scott Base, Antarctica (78° S). These measurements demonstrate the evolution of the ClO altitude profile (from 15 to 40 km) as the ozone hole progresses from the onset of sunlight in early August until the beginning of the breakup of the vortex in early October. The measurements from 1986 and 1987 were part of the National Ozone Expedition and the 1996 to 2005 measurements are carried out as part of the Network for the Detection of Stratospheric Change, NDSC. The 1986 measurements were the first detection of a huge excess of chlorine monoxide during the Antarctic ozone hole period and the 1987 measurements produced the first full altitude profile of ClO over Antarctica. The last 10 years of measurements were carried out with an instrument very similar to the one used in the 1980's, but automated for continuous operation. The ClO altitude profile from the older measurements will be compared to the more recent measurements and variations in the time sequence of active chlorine from year to year will be discussed. We will also report on changes and/or trends in the peak mixing ratios from year to year both within the 10 year sequence (1996 to 2005) and between the recent measurements and the data from the 1980's. The measurements will also be compared to models to test the current understanding of chlorine chemistry.
UR: http://chloe.ess.sunysb.edu
DE: 0340 Middle atmosphere: composition and chemistry
DE: 1610 Atmosphere (0315, 0325)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005