Heterogeneous physicochemistry of the winter polar stratosphere
Present chemical theories of the Antarctic ozone hole assume that heterogeneous reactions involving polar stratospheric clouds (PSCs) are the precursor of springtime ozone depletions. However, none of the theories quantify the rates of proposed heterogeneous processed, and none utilize the extensive...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19890005164 2023-05-15T13:35:11+02:00 Heterogeneous physicochemistry of the winter polar stratosphere Turco, R. P. Toon, O. B. Unclassified, Unlimited, Publicly available May 1, 1988 application/pdf http://hdl.handle.net/2060/19890005164 unknown Document ID: 19890005164 Accession ID: 89N14535 http://hdl.handle.net/2060/19890005164 No Copyright CASI ENVIRONMENT POLLUTION NASA, Goddard Space Flight Center, Polar Ozone Workshop. Abstracts; p 85-89 1988 ftnasantrs 2015-03-15T05:59:55Z Present chemical theories of the Antarctic ozone hole assume that heterogeneous reactions involving polar stratospheric clouds (PSCs) are the precursor of springtime ozone depletions. However, none of the theories quantify the rates of proposed heterogeneous processed, and none utilize the extensive data base on PSC's. Thus, all of the theories must be considered incomplete until the heterogeneous mechanisms are properly defined. A unified treatment developed of the cloud related processes, both physical and chemical, and the importance of these processes using observation data is calibrated. The rates are compared competitive heterogeneous processes to place reasonable limits on critical mechanisms such as the denitrification and dechlorination of the polar winter stratosphere. Among the subjects addressed here are the physical/chemical properties of PSC's including their relevant microphysical, optical and compositional characteristics, mass transfer rates of gaseous constituents to cloud particles, adsorption, accommodation and sticking coefficients on cloud particles, time constants for condensation, absorption and other microphysical processes, effects of solubility and vapor pressure on cloud composition, the statistics of cloud processing of chemically active condensible species, rate limiting steps in heterogeneous chemical reactions, and the nonlinear dependence of ozone loss on physical and chemical parameters. 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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ftnasantrs |
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ENVIRONMENT POLLUTION |
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ENVIRONMENT POLLUTION Turco, R. P. Toon, O. B. Heterogeneous physicochemistry of the winter polar stratosphere |
topic_facet |
ENVIRONMENT POLLUTION |
description |
Present chemical theories of the Antarctic ozone hole assume that heterogeneous reactions involving polar stratospheric clouds (PSCs) are the precursor of springtime ozone depletions. However, none of the theories quantify the rates of proposed heterogeneous processed, and none utilize the extensive data base on PSC's. Thus, all of the theories must be considered incomplete until the heterogeneous mechanisms are properly defined. A unified treatment developed of the cloud related processes, both physical and chemical, and the importance of these processes using observation data is calibrated. The rates are compared competitive heterogeneous processes to place reasonable limits on critical mechanisms such as the denitrification and dechlorination of the polar winter stratosphere. Among the subjects addressed here are the physical/chemical properties of PSC's including their relevant microphysical, optical and compositional characteristics, mass transfer rates of gaseous constituents to cloud particles, adsorption, accommodation and sticking coefficients on cloud particles, time constants for condensation, absorption and other microphysical processes, effects of solubility and vapor pressure on cloud composition, the statistics of cloud processing of chemically active condensible species, rate limiting steps in heterogeneous chemical reactions, and the nonlinear dependence of ozone loss on physical and chemical parameters. |
format |
Other/Unknown Material |
author |
Turco, R. P. Toon, O. B. |
author_facet |
Turco, R. P. Toon, O. B. |
author_sort |
Turco, R. P. |
title |
Heterogeneous physicochemistry of the winter polar stratosphere |
title_short |
Heterogeneous physicochemistry of the winter polar stratosphere |
title_full |
Heterogeneous physicochemistry of the winter polar stratosphere |
title_fullStr |
Heterogeneous physicochemistry of the winter polar stratosphere |
title_full_unstemmed |
Heterogeneous physicochemistry of the winter polar stratosphere |
title_sort |
heterogeneous physicochemistry of the winter polar stratosphere |
publishDate |
1988 |
url |
http://hdl.handle.net/2060/19890005164 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
CASI |
op_relation |
Document ID: 19890005164 Accession ID: 89N14535 http://hdl.handle.net/2060/19890005164 |
op_rights |
No Copyright |
_version_ |
1766062030123433984 |