Observations of chlorine monoxide over Scott Base, Antarctica, during the ozone hole, 1996-2005
Open-File Report
2007-1047-SRP-077
By: Brian Connor, Philip Solomon, James Barrett, Thomas Mooney, and Alan Parrish
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Abstract
We report observations of chlorine monoxide, ClO, in the lower stratosphere, made from Scott Base
(77.85º S, 166.77º E) in springtime during each year, 1996-2005. The ClO amounts in the atmosphere are
retrieved from remote measurements of microwave emission spectra. ClO column densities of up to about 2.5 ×
1015 cm-2
are recorded during September, when chlorine is present in chemically active forms due to reactions on
the surface of Polar Stratospheric Cloud (PSC) particles. Maximum mixing ratios of ClO are approximately 2
ppbv. The annual average of ClO column density during the activation period is anticorrelated with similar
averages of ozone column measured at nearby Arrival Heights, with correlation coefficient of –0.81, and with
averages of ozone mass integrated over the entire polar region, with similar correlation coefficients. There was a
substantial decrease in ClO amounts during 2002-2004. There has been no systematic change in the timing of
chlorine deactivation attributable to secular change in the Antarctic vortex
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Observations of chlorine monoxide over Scott Base, Antarctica, during the ozone hole, 1996-2005 |
| Series title | Open-File Report |
| Series number | 2007-1047-SRP-077 |
| DOI | 10.3133/ofr20071047SRP077 |
| Year Published | 2007 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 4 p. |
| Larger Work Type | Report |
| Larger Work Subtype | USGS Numbered Series |
| Larger Work Title | Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. Santa Barbara, California, U.S.A.--August 26 to September 1, 2007 |
| Other Geospatial | Antarctica |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |