New observations of a large concentration of ClO in the springtime lower stratosphere over Antarctica and its implications for ozone-depleting chemistry
New measurements of stratospheric chlorine monoxide (ClO) were made at McMurdo Station, Antarctica, during the austral spring of 1987. Rotational emission line spectroscopy, employing a ground-based detector, was used to determine mixing ratio profiles over the range about 17-45 km. A spectral band...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19890066532 2023-05-15T14:04:33+02:00 New observations of a large concentration of ClO in the springtime lower stratosphere over Antarctica and its implications for ozone-depleting chemistry De Zafra, R. L. Jaramillo, M. Barrett, J. Emmons, L. K. Solomon, P. M. Unclassified, Unlimited, Publicly available Aug 30, 1989 http://ntrs.nasa.gov/search.jsp?R=19890066532 unknown http://ntrs.nasa.gov/search.jsp?R=19890066532 Accession ID: 89A53903 Copyright Other Sources 46 Journal of Geophysical Research; 94; 11423-11 1989 ftnasantrs 2012-02-15T18:08:07Z New measurements of stratospheric chlorine monoxide (ClO) were made at McMurdo Station, Antarctica, during the austral spring of 1987. Rotational emission line spectroscopy, employing a ground-based detector, was used to determine mixing ratio profiles over the range about 17-45 km. A spectral band pass double that was used for similar measurements in 1986 allowed an improvement to be made in the definition of the anomalous low-altitude stratospheric ClO layer associated with springtime ozone depletion. A peak mixing ratio of 1.6 + or - 0.4 parts per billion by volume (ppbv) (95 percent confidence level) was found at 19.5 + or - 1 km at midday during the period September 20-24, 1987. The observed peak mixing ratio and diurnal behavior are discussed in relation to chemical depletion theories. Calculations indicate that the large observed ClO concentration provides an efficient closure for a catalytic Cl cycle through the ClO dimer mechanism, yielding good agreement with various observed features of O3 depletion. Other/Unknown Material Antarc* Antarctica NASA Technical Reports Server (NTRS) Austral McMurdo Station ENVELOPE(166.667,166.667,-77.850,-77.850) |
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46 De Zafra, R. L. Jaramillo, M. Barrett, J. Emmons, L. K. Solomon, P. M. New observations of a large concentration of ClO in the springtime lower stratosphere over Antarctica and its implications for ozone-depleting chemistry |
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46 |
description |
New measurements of stratospheric chlorine monoxide (ClO) were made at McMurdo Station, Antarctica, during the austral spring of 1987. Rotational emission line spectroscopy, employing a ground-based detector, was used to determine mixing ratio profiles over the range about 17-45 km. A spectral band pass double that was used for similar measurements in 1986 allowed an improvement to be made in the definition of the anomalous low-altitude stratospheric ClO layer associated with springtime ozone depletion. A peak mixing ratio of 1.6 + or - 0.4 parts per billion by volume (ppbv) (95 percent confidence level) was found at 19.5 + or - 1 km at midday during the period September 20-24, 1987. The observed peak mixing ratio and diurnal behavior are discussed in relation to chemical depletion theories. Calculations indicate that the large observed ClO concentration provides an efficient closure for a catalytic Cl cycle through the ClO dimer mechanism, yielding good agreement with various observed features of O3 depletion. |
format |
Other/Unknown Material |
author |
De Zafra, R. L. Jaramillo, M. Barrett, J. Emmons, L. K. Solomon, P. M. |
author_facet |
De Zafra, R. L. Jaramillo, M. Barrett, J. Emmons, L. K. Solomon, P. M. |
author_sort |
De Zafra, R. L. |
title |
New observations of a large concentration of ClO in the springtime lower stratosphere over Antarctica and its implications for ozone-depleting chemistry |
title_short |
New observations of a large concentration of ClO in the springtime lower stratosphere over Antarctica and its implications for ozone-depleting chemistry |
title_full |
New observations of a large concentration of ClO in the springtime lower stratosphere over Antarctica and its implications for ozone-depleting chemistry |
title_fullStr |
New observations of a large concentration of ClO in the springtime lower stratosphere over Antarctica and its implications for ozone-depleting chemistry |
title_full_unstemmed |
New observations of a large concentration of ClO in the springtime lower stratosphere over Antarctica and its implications for ozone-depleting chemistry |
title_sort |
new observations of a large concentration of clo in the springtime lower stratosphere over antarctica and its implications for ozone-depleting chemistry |
publishDate |
1989 |
url |
http://ntrs.nasa.gov/search.jsp?R=19890066532 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(166.667,166.667,-77.850,-77.850) |
geographic |
Austral McMurdo Station |
geographic_facet |
Austral McMurdo Station |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19890066532 Accession ID: 89A53903 |
op_rights |
Copyright |
_version_ |
1766275729819959296 |