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Measurements of the vertical profile, diurnal variation, and secular change of ClO in the stratosphere over Thule, Greenland, February-March, 1992We report observations of stratospheric chlorine monoxide over the altitude range approx. 16 to 50 km at Thule, Greenland from Feb. 8 to Mar. 24, 1992. A new, more sensitive ground-based mm-wave spectrometer was employed for these measurements, similar in principle to that used earlier for the discovery of low altitude ClO in the Antarctic springtime. In this report, we discuss different aspects of vertical distribution, secular trends, and diurnal variation of ClO in the Arctic stratosphere, based on a preliminary analysis of our Thule data. We see no evidence for large (approx. 1.2-1.5 ppb) amounts of ClO in the lower stratosphere at any time during February or March, in agreement with UARS-MLS findings for this period, and in marked contrast to findings reported for the Arctic in January. We have some evidence for small enhancements (approx. 0.2-0.5 ppb) in the 18-30 km range in late February-early March, which might be associated with volcanic aerosol, rather than PSC, processing.
Document ID
19950004618
Document Type
Conference Paper
Authors
Dezafra, Robert L. (State Univ. of New York Stony Brook, NY, United States)
Emmons, Louisa K. (State Univ. of New York Stony Brook, NY, United States)
Reeves, John M. (State Univ. of New York Stony Brook, NY, United States)
Shindell, Drew T. (State Univ. of New York Stony Brook, NY, United States)
Date Acquired
September 6, 2013
Publication Date
April 1, 1994
Publication Information
Publication: NASA. Goddard Space Flight Center, Ozone in the Troposphere and Stratosphere, Part 2
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF ATM-84-19733
CONTRACT_GRANT: NSF DPP-89-22688
CONTRACT_GRANT: NAGW-2182
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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