Heterogeneous chemistry on Antarctic polar stratospheric clouds - A microphysical estimate of the extent of chemical processing
A detailed model of polar stratospheric clouds (PSCs), which includes nucleation, condensational growth. and sedimentation processes, has been applied to the study of heterogeneous chemical reactions. For the first time, the extent of chemical processing during a polar winter has been estimated for...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19930057273 2023-05-15T14:04:19+02:00 Heterogeneous chemistry on Antarctic polar stratospheric clouds - A microphysical estimate of the extent of chemical processing Drdla, K. Turco, R. P. Elliott, S. Unclassified, Unlimited, Publicly available May 20, 1993 http://ntrs.nasa.gov/search.jsp?R=19930057273 unknown http://ntrs.nasa.gov/search.jsp?R=19930057273 Accession ID: 93A41270 Copyright Other Sources 46 Journal of Geophysical Research; 98; D5; p. 8965-8981. 1993 ftnasantrs 2012-02-15T20:09:50Z A detailed model of polar stratospheric clouds (PSCs), which includes nucleation, condensational growth. and sedimentation processes, has been applied to the study of heterogeneous chemical reactions. For the first time, the extent of chemical processing during a polar winter has been estimated for an idealized air parcel in the Antarctic vortex by calculating in detail the rates of heterogeneous reactions on PSC particles. The resulting active chlorine and NO(x) concentrations at first sunrise are analyzed with respect to their influence upon the Antarctic ozone hole using a photochemical model. It is found that the species present at sunrise are primarily influenced by the relative values of the heterogeneous reaction rate constants and the initial gas concentrations. However, the extent of chlorine activation is also influenced by whether N2O5 is removed by reaction with HCl or H2O. The reaction of N2O5 with HCl, which occurs rapidly on type 1 PSCs, activates the chlorine contained in the reservoir species HCl. Hence the presence and surface area of type 1 PSCs early in the winter are crucial in determining ozone depletion. Other/Unknown Material Antarc* Antarctic NASA Technical Reports Server (NTRS) Antarctic The Antarctic |
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NASA Technical Reports Server (NTRS) |
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46 |
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46 Drdla, K. Turco, R. P. Elliott, S. Heterogeneous chemistry on Antarctic polar stratospheric clouds - A microphysical estimate of the extent of chemical processing |
topic_facet |
46 |
description |
A detailed model of polar stratospheric clouds (PSCs), which includes nucleation, condensational growth. and sedimentation processes, has been applied to the study of heterogeneous chemical reactions. For the first time, the extent of chemical processing during a polar winter has been estimated for an idealized air parcel in the Antarctic vortex by calculating in detail the rates of heterogeneous reactions on PSC particles. The resulting active chlorine and NO(x) concentrations at first sunrise are analyzed with respect to their influence upon the Antarctic ozone hole using a photochemical model. It is found that the species present at sunrise are primarily influenced by the relative values of the heterogeneous reaction rate constants and the initial gas concentrations. However, the extent of chlorine activation is also influenced by whether N2O5 is removed by reaction with HCl or H2O. The reaction of N2O5 with HCl, which occurs rapidly on type 1 PSCs, activates the chlorine contained in the reservoir species HCl. Hence the presence and surface area of type 1 PSCs early in the winter are crucial in determining ozone depletion. |
format |
Other/Unknown Material |
author |
Drdla, K. Turco, R. P. Elliott, S. |
author_facet |
Drdla, K. Turco, R. P. Elliott, S. |
author_sort |
Drdla, K. |
title |
Heterogeneous chemistry on Antarctic polar stratospheric clouds - A microphysical estimate of the extent of chemical processing |
title_short |
Heterogeneous chemistry on Antarctic polar stratospheric clouds - A microphysical estimate of the extent of chemical processing |
title_full |
Heterogeneous chemistry on Antarctic polar stratospheric clouds - A microphysical estimate of the extent of chemical processing |
title_fullStr |
Heterogeneous chemistry on Antarctic polar stratospheric clouds - A microphysical estimate of the extent of chemical processing |
title_full_unstemmed |
Heterogeneous chemistry on Antarctic polar stratospheric clouds - A microphysical estimate of the extent of chemical processing |
title_sort |
heterogeneous chemistry on antarctic polar stratospheric clouds - a microphysical estimate of the extent of chemical processing |
publishDate |
1993 |
url |
http://ntrs.nasa.gov/search.jsp?R=19930057273 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19930057273 Accession ID: 93A41270 |
op_rights |
Copyright |
_version_ |
1766275360101498880 |