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| Titel |
A UT/LS ozone climatology of the nineteen seventies deduced from the GASP aircraft measurement program |
| VerfasserIn |
C. Schnadt Poberaj, J. Staehelin, D. Brunner, V. Thouret, V. Mohnen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 7, no. 22 ; Nr. 7, no. 22 (2007-11-29), S.5917-5936 |
| Datensatznummer |
250005266
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| Publikation (Nr.) |
 copernicus.org/acp-7-5917-2007.pdf |
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| Zusammenfassung |
| We present ozone measurements of the Global Atmospheric Sampling Program
(GASP) performed from four commercial and one research aircraft in the late
1970s. The GASP quality assurance and control program was reviewed,
and an ozone climatology of the upper troposphere and lower stratosphere (UT/LS)
of the years 1975–1979 was built. The data set was
estimated to have an overall uncertainty of 9% or 3 ppb whichever is
greater for the first two years and 4% or 3 ppb for the remaining years,
i.e. after implementation of silicone rubber membranes in the pumps. Two
cases of nearly coincident flights of two GASP airliners along the same
flight route, and the comparison with independent observations from the
literature, including ozonesondes and aircraft campaigns, indicate that the
ozone measurements are of high quality. The UT/LS climatology of the GASP
data set is in general agreement with that derived from MOZAIC in the 1990s
in regions covered by both programmes. GASP provides unique large-scale
climatological information on UT/LS ozone above the northern hemisphere
Pacific region, which is not covered by MOZAIC. There, the GASP climatology
confirms several characteristic features derived from individual research
aircraft campaigns and from ozone soundings. In particular, summertime ozone
in the UT over the midlatitude eastern Pacific Ocean was significantly lower
in the 1970s than over the American continent. The generally lower ozone
concentrations in the tropics near the dateline as compared to farther east
are indicative of convective uplifting of ozone poor air from the marine
boundary layer. |
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