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Quantitative observations of the behavior of anomalous low altitude ClO in the Antarctic spring Stratosphere, 1987During the second National Ozone Expedition ground-based observations at McMurdo Station Antarctica were performed which resulted in a second season's measurement of abnormally large amounts of ClO in the Antarctic spring stratosphere. The original measurements of 1986, in which the presence of this anomalous layer was first discovered, were limited in low altitude recovery of the ClO mixing ratio profile by the restrictions of the spectral bandwidth (256 MHz) which was used to measure the pressure-broadened ClO emission line shape. The 1987 measurements were marked by the use of twice the spectral bandpass employed the previous year, and allow a better characterization of the ClO mixing ratio profile in the critical altitude range 18 to 25 km. In-situ aircraft measurements of ClO made over the Palmer Peninsula during Aug. and Sept. of 1987 by Anderson, et al. effectively determined the important question of the ClO mixing ratio profile at altitudes inaccessible to our technique, below approximately 18 to 18.5 km. These flights did not penetrate further than 75 deg S, however, (vs 78 deg S for McMurdo) and were thus limited to coverage near the outer boundaries of the region of severest ozone depletion over Antarctica in 1987, did not reach an altitude convincingly above that of the peak mixing ratio for ClO, and were not able to make significant observations of the diurnal variation of ClO. The two techniques, and the body of data recovered by each, thus complement one another in producing a full picture of the anomalous ClO layer intimately connected with the region of Antarctic spring ozone depletion. An analysis is presented of the mixing ratio profile from approximately 18 to 45 km, the diurnal behavior, and the secular change in ClO over McMurdo Station during Sept. and early Oct. 1987.
Document ID
19890005177
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Dezafra, R. L. (State Univ. of New York Stony Brook, NY, United States)
Jaramillo, M. (State Univ. of New York Stony Brook, NY, United States)
Barrett, J. (State Univ. of New York Stony Brook, NY, United States)
Emmons, L. (State Univ. of New York Stony Brook, NY, United States)
Solomon, P. (State Univ. of New York Stony Brook, NY, United States)
Parrish, A. (State Univ. of New York Stony Brook, NY, United States)
Date Acquired
September 5, 2013
Publication Date
May 1, 1988
Publication Information
Publication: NASA, Goddard Space Flight Center, Polar Ozone Workshop. Abstracts
Subject Category
Environment Pollution
Accession Number
89N14548
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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