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| Titel |
Evidence of a 50-year increase in tropospheric ozone in Upper Bavaria |
| VerfasserIn |
M. Schmidt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 12, no. 12 ; Nr. 12, no. 12, S.1197-1206 |
| Datensatznummer |
250011249
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| Publikation (Nr.) |
 copernicus.org/angeo-12-1197-1994.pdf |
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| Zusammenfassung |
| In a series of ozone-sonde soundings at the
Hohenpeißenberg observatory, starting in 1967, the most striking features are
increases of \sim2.2% per year in all tropospheric heights up to 8 km during the
past 24 years. These facts have recently been published and discussed by several
authors. In this paper, we present some evidence for the increase of
tropospheric ozone concentrations during the past 50 years 1940-1990 in the
territory of the northern edge of the Bavarian Alps, including the Hohenpeißenberg
data. In December 1940 and August 1942, probably the first exact wet-chemical
vertical soundings of ozone up to 9 km height were made by an aircraft in the
region mentioned. These results were published in the earlier literature. We
have converted the results of the flights on 4 days in December 1940 and on 6
days in August 1942 to modern units and have compared them with the Hohenpeißenberg
ozone-sonde data of the December and August months. We also compared the data at
the ground with the August results of Paris-Montsouris 1886-1898. Our results
show an increase of ozone concentration at all tropospheric heights in Upper
Bavaria during the past 50 years, compared with the Montsouris data in August
during the past 105 years. In the recently published papers, the increases since
1967 were approximated linearly.Our results, extended to the past, show
non-linear trends, with steeper increases since 1975-1979. Possible reasons for
these findings are discussed. Quite recently (in case of the December months
since 1986/87, the August months since 1990), the ozone mixing ratios at and
above Hohenpeißenberg seem to have decreased. |
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