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| Titel |
Five blind men and the elephant: what can the NASA Aura ozone measurements tell us about stratosphere-troposphere exchange? |
| 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 ; 12, no. 5 ; Nr. 12, no. 5 (2012-03-02), S.2357-2380 |
| Datensatznummer |
250010849
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| Publikation (Nr.) |
 copernicus.org/acp-12-2357-2012.pdf |
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| Zusammenfassung |
| We examine whether the individual ozone (O3) measurements from the four Aura
instruments can quantify the stratosphere-troposphere exchange (STE) flux of
O3, an important term of the tropospheric O3 budget. The level 2 (L2)
Aura swath data and the nearly coincident ozone sondes for the years 2005–2006
are compared with the 4-D, high-resolution
(1° × 1° × 40-layer × 0.5 h) model simulation of
atmospheric ozone for the same period from the University of California, Irvine
chemistry transport model (CTM). The CTM becomes a transfer standard for
comparing individual profiles from these five, not-quite-coincident
measurements of atmospheric ozone. Even with obvious model discrepancies
identified here, the CTM can readily quantify instrument-instrument biases in
the tropical upper troposphere and mid-latitude lower stratosphere. In terms of
STE processes, all four Aura datasets have some skill in identifying
stratosphere-troposphere folds, and we find several cases where both model and
measurements see evidence of high-O3 stratospheric air entering the
troposphere. In many cases identified in the model, however, the individual
Aura profile retrievals in the upper troposphere and lower stratosphere show
too much noise, as expected from their low sensitivity and coarse vertical
resolution at and below the tropopause. These model-measurement comparisons of
individual profiles do provide some level of confidence in the model-derived
STE O3 flux, but it will be difficult to integrate this flux from the
satellite data alone. |
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