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| Titel |
Influence of stratospheric airmasses on tropospheric vertical O3 columns based on GOME (Global Ozone Monitoring Experiment) measurements and backtrajectory calculation over the Pacific |
| VerfasserIn |
A. Ladstätter-Weißenmayer, J. Meyer-Arnek, A. Schlemm, J. P. Burrows |
| 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 ; 4, no. 4 ; Nr. 4, no. 4 (2004-06-21), S.903-909 |
| Datensatznummer |
250001827
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| Publikation (Nr.) |
 copernicus.org/acp-4-903-2004.pdf |
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| Zusammenfassung |
| Satellite based GOME (Global Ozone Measuring experiment) data are used to
characterize the amount of tropospheric ozone over the tropical Pacific.
Tropospheric ozone was determined from GOME data using the Tropospheric
Excess Method (TEM). In the tropical Pacific a significant seasonal
variation is detected. Tropospheric excess ozone is enhanced during the
biomass burning season from September to November due to outflow from the
continents. In September 1999 GOME data reveal an episode of increased
excess ozone columns over Tahiti (18.0° S; 149.0° W)
(Eastern Pacific) compared
to Am. Samoa (14.23° S; 170.56° W) and Fiji
(18.13° S; 178.40° E), both situated
in the Western Pacific. Backtrajectory calculations show that none of the
airmasses arriving over the three locations experienced anthropogenic
pollution (e. g. biomass burning). Consequently other sources of ozone have
to be considered. One possible process leading to an increase of tropospheric
ozone is stratosphere-troposphere-exchange. An analysis of the potential
vorticity along trajectories arriving above each of the locations reveals
that airmasses at Tahiti are subject to enhanced stratospheric influence,
compared to Am. Samoa and Fiji. As a result this study shows clear
incidents of transport of airmasses from the stratosphere into the
troposphere. |
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