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| Titel |
Correlating tropospheric column ozone with tropopause folds: the Aura-OMI satellite data |
| VerfasserIn |
Q. Tang, M. J. Prather |
| 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 ; 10, no. 19 ; Nr. 10, no. 19 (2010-10-12), S.9681-9688 |
| Datensatznummer |
250008827
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| Publikation (Nr.) |
 copernicus.org/acp-10-9681-2010.pdf |
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| Zusammenfassung |
| The geographic and temporal variations in tropospheric and
stratospheric ozone columns from individual swath measurements of
the Ozone Monitoring Instrument (OMI), on the NASA Aura spacecraft,
are reasonably well simulated by the University of California,
Irvine (UCI) chemistry transport model (CTM) using
1°×1°×40-layer meteorological fields for
the year 2005. From the CTM we find that high-frequency spatial
variations in tropospheric column ozone (TCO), including around the
jet streams, are not generally correlated with variations in
stratospheric ozone column, but instead are collocated with folding
events involving stratospheric-origin, high-ozone layers below the
tropopause. The CTM fold events are verified in many cases with
available ozone sondes. Using the OMI Level 2 profiles, and defining
tropopause height from our CTM using the European Centre for
Medium-Range Weather Forecasts (ECMWF) fields, we find that most of
the variations in TCO near CTM folding events are also not
correlated with those in stratospheric ozone column. A large
fraction of the OMI TCO variance is accurately simulated by the CTM
where the variance is significant, especially along the subtropical
jets. The absolute tropospheric columns from OMI and CTM agree
swath-by-swath, pixel-by-pixel within ±5 Dobson Units (DU) for
most cases. Notable exceptions are in the tropics where neither the
high ozone from biomass burning nor the low ozone in the convergence
zones over the Pacific is found in the OMI observations, because of
OMI's insensitivity to the lower troposphere. Another difference is
identified with the OMI profiles near the southern subtropical jet.
The CTM has a high bias in stratospheric column outside the tropics,
due to problems previously identified with the stratospheric
circulation in the 40-layer meteorological fields. Overall, we
identify ozone folds with short-lived features in TCO that have
scales of a few hundred kilometres as observed by OMI. |
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