Causes and effects of a hole
Preliminary results from the U.S. National Ozone Expedition (NOZE) to Antarctica are reviewed. The NOZE ozonesonde measurements showed significant vertical structure in the hole, with 80 percent depletion in some of the 1 km layers but only 20 percent in adjacent layers. The depletion was confined t...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19870043209 2023-05-15T14:01:08+02:00 Causes and effects of a hole Margitan, J. J. Unclassified, Unlimited, Publicly available Jan 22, 1987 http://ntrs.nasa.gov/search.jsp?R=19870043209 unknown http://ntrs.nasa.gov/search.jsp?R=19870043209 Accession ID: 87A30483 Copyright Other Sources 46 Nature; 325; 297 1987 ftnasantrs 2012-02-15T17:11:42Z Preliminary results from the U.S. National Ozone Expedition (NOZE) to Antarctica are reviewed. The NOZE ozonesonde measurements showed significant vertical structure in the hole, with 80 percent depletion in some of the 1 km layers but only 20 percent in adjacent layers. The depletion was confined to the 12-20 km region, beginning first at higher altitude and progressing downward. This is strong evidence against the theory that the ozone hole is due to solar activity producing odd nitrogen at high altitudes which is transported downwards, leading to enhanced odd-nitrogen catalytic cycles that destroy ozone. Nitrous oxide data show unusually low concentrations within the polar vortex, which is evidence against the theory that the hole is caused by a purely dynamical mechanism in which rising air motions within the polar vortex lead to reduced column densities of ozone. It is tentatively concluded that a chemical mechanism involving man-made chlorofluorocarbons is the likely cause of ozone depletion in the hole. Other/Unknown Material Antarc* Antarctica NASA Technical Reports Server (NTRS) |
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46 Margitan, J. J. Causes and effects of a hole |
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Preliminary results from the U.S. National Ozone Expedition (NOZE) to Antarctica are reviewed. The NOZE ozonesonde measurements showed significant vertical structure in the hole, with 80 percent depletion in some of the 1 km layers but only 20 percent in adjacent layers. The depletion was confined to the 12-20 km region, beginning first at higher altitude and progressing downward. This is strong evidence against the theory that the ozone hole is due to solar activity producing odd nitrogen at high altitudes which is transported downwards, leading to enhanced odd-nitrogen catalytic cycles that destroy ozone. Nitrous oxide data show unusually low concentrations within the polar vortex, which is evidence against the theory that the hole is caused by a purely dynamical mechanism in which rising air motions within the polar vortex lead to reduced column densities of ozone. It is tentatively concluded that a chemical mechanism involving man-made chlorofluorocarbons is the likely cause of ozone depletion in the hole. |
format |
Other/Unknown Material |
author |
Margitan, J. J. |
author_facet |
Margitan, J. J. |
author_sort |
Margitan, J. J. |
title |
Causes and effects of a hole |
title_short |
Causes and effects of a hole |
title_full |
Causes and effects of a hole |
title_fullStr |
Causes and effects of a hole |
title_full_unstemmed |
Causes and effects of a hole |
title_sort |
causes and effects of a hole |
publishDate |
1987 |
url |
http://ntrs.nasa.gov/search.jsp?R=19870043209 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19870043209 Accession ID: 87A30483 |
op_rights |
Copyright |
_version_ |
1766270734536015872 |