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| Titel |
On the seasonal dependence of tropical lower-stratospheric temperature trends |
| VerfasserIn |
Q. Fu, S. Solomon, P. Lin |
| 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. 6 ; Nr. 10, no. 6 (2010-03-18), S.2643-2653 |
| Datensatznummer |
250008247
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| Publikation (Nr.) |
 copernicus.org/acp-10-2643-2010.pdf |
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| Zusammenfassung |
| This study examines the seasonality of tropical lower-stratospheric
temperature trends using the Microwave Sounding Unit lower-stratospheric
channel (T4) for 1980–2008. We present evidence that this seasonality is
largely a response to changes in the Brewer-Dobson circulation (BDC) driven
by extratropical wave forcing. We show how the tropical T4 trend can be
used as an indicator of changes in the BDC, and find that the BDC is
strengthening for 1980–2008 in June–November related to the Southern
Hemisphere (SH) and in December–February to the Northern Hemisphere (NH). In
marked contrast, we find that the BDC is weakening in March–May, apparently
because of a weakening of its northern cell. The novel observational
evidence on the seasonal dependence of the BDC trends presented in this
study has important implications for the understanding of climate change in
the stratosphere as well as testing climate model simulations. |
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