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Measurements of Halogenated Organic Compounds near the Tropical TropopauseThe amount of organic chlorine and bromine entering the stratosphere have a direct influence on the magnitude of chlorine and bromine catalyzed ozone losses. Twelve organic chlorine species and five organic bromine species were measured from 12 samples collected near the tropopause between 23.8 deg N and 25.3 deg N during AASE 2. The average mixing ratios of total organic chlorine and total organic bromine were 3.50 +/- 0.06 ppbv and 21.1 +/- 0.8 pptv, respectively. CH3Cl represented 15.1% of the total organic chlorine, with CFC 11 (CCl3F) and CFC 12 (CCl2F2) accounting for 22.6% and 28.2%, respectively, with the remaining 34.1% primarily from CCl4, CH3CCl3, and CFC 113 (CCl2FCClF2). CH3Br represented 54% of the total organic bromine. The 95% confidence intervals of the mixing ratios of all but four of the individual compounds were within the range observed in low and mid-latitude midtroposphere samples. The four compounds with significantly lower mixing ratios at the tropopause were CHCl3, CH2Cl2, CH2Br2, and CH3CCl3. The lower mixing ratios may be due to entrainment of southern hemisphere air during vertical transport in the tropical region and/or to exchange of air across the tropopause between the lower stratosphere and upper troposphere.
Document ID
19970028659
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
Authors
Schauffler, S. M.
(National Center for Atmospheric Research Boulder, CO United States)
Heidt, L. E.
(National Center for Atmospheric Research Boulder, CO United States)
Pollock, W. H.
(National Center for Atmospheric Research Boulder, CO United States)
Gilpin, T. M.
(National Center for Atmospheric Research Boulder, CO United States)
Vedder, J. F.
(NASA Ames Research Center Moffett Field, CA United States)
Solomon, S.
(Colorado Univ. Boulder, CO United States)
Leub, R. A.
(National Center for Atmospheric Research Boulder, CO United States)
Atlas, E. L.
(National Center for Atmospheric Research Boulder, CO United States)
Date Acquired
August 17, 2013
Publication Date
November 19, 1993
Publication Information
Publication: Airborne Arctic Stratospheric Expedition 2 Air Parcel Trajectories
Publisher: American Geophysical Union
Volume: 20
Issue: 22
ISSN: 0094-8354
Subject Category
Environment Pollution
Accession Number
97N72320
Distribution Limits
Public
Copyright
Public Use Permitted.
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