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First Observations of Iodine Oxide from SpaceWe present retrievals of IO total columns from the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) satellite instrument. We analyze data for October 2005 in the polar regions to demonstrate for the first time the capability to measure IO column abundances from space. During the period of analysis (i.e. Southern Hemisphere springtime), enhanced IO vertical columns over 3 x 10(exp 13) molecules cm(exp -2) are observed around coastal Antarctica; by contrast during that time in the Arctic region IO is consistently below the calculated instrumental detection limit for individual radiance spectra (2-4 x 10(exp 12) molecules cm(exp -2) for slant columns). The levels reported here are in reasonably good agreement with previous ground-based measurements at coastal Antarctica. These results also demonstrate that IO is widespread over sea-ice covered areas in the Southern Ocean. The occurrence of elevated IO and its hitherto unrecognized spatial distribution suggest an efficient iodine activation mechanism at a synoptic scale over coastal Antarctica.
Document ID
20080047100
Acquisition Source
Jet Propulsion Laboratory
Document Type
Reprint (Version printed in journal)
Authors
Saiz-Lopez, Alfonso
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Chance, Kelly
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Liu, Xiong
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kurosu, Thomas P.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Sander, Stanley P.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 24, 2013
Publication Date
June 29, 2007
Publication Information
Publication: Geophysical Research Letters
Volume: 34
ISSN: 0094-8276
Subject Category
Space Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
emissions
marine boundary-layer
stratospheric ozone
chemistry
io
molecular-iodine

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