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<article language="en">
	<journal>
		<journal_title>Nonlinear Processes  in Geophysics</journal_title>
		<journal_url>www.nonlin-processes-geophys.net</journal_url>
		<issn>1023-5809</issn>
		<eissn>1607-7946</eissn>
		<volume_number>16</volume_number>
		<issue_number>3</issue_number>
		<publication_year>2009</publication_year>
	</journal>
	<doi>10.5194/npg-16-409-2009</doi>
	<article_url>http://www.nonlin-processes-geophys.net/16/409/2009/</article_url>
	<abstract_html>http://www.nonlin-processes-geophys.net/16/409/2009/npg-16-409-2009.html</abstract_html>
	<fulltext_pdf>http://www.nonlin-processes-geophys.net/16/409/2009/npg-16-409-2009.pdf</fulltext_pdf>
	<start_page>409</start_page>
	<end_page>418</end_page>
	<publication_date>2009-06-19</publication_date>
	<article_title content_type="html">Upper stratospheric ozone decrease events due to a positive feedback between ozone and the ozone dissociation rate</article_title>
	<authors>
		<author numeration="1" affiliations="1,2">
			<name>G. R. Sonnemann</name>
			<email>sonnemann@iap-kborn.de</email>
		</author>
		<author numeration="2" affiliations="2">
			<name>P. Hartogh</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Leibniz-Institute of Atmospheric Physics at the University of Rostock, Schloss-Str. 6, 18225 Ostseebad Kühlungsborn, Germany</affiliation>
		<affiliation numeration="2" content_type="html">Max-Planck-Institute for Solar System Research, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany</affiliation>
	</affiliations>
	<abstract content_type="html">Ozone measurements taken with a ground based microwave instrument at Lindau
(51.66&amp;deg; N, 10.13&amp;deg; E) over some years showed strong ozone
decrease events within the stratopause region, particularly during the
winter half-year. These events are characterized by a marked drop of the
ozone mixing ratio from two to three ppmv to less than half a ppmv in
extreme cases. Simultaneous water vapor measurements at the same place, also
carried out by a microwave instrument, showed a strong increase of its
mixing ratio and the temperature was also enhanced during these episodes.
The theoretical analysis brought evidence that these events result from a
positive feedback in the complex radiatively-chemical system between the
ozone column density and the ozone dissociation rate.</abstract>
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