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| Titel |
Variability of subtropical upper tropospheric humidity |
| VerfasserIn |
J.-M. Ryoo, D. W. Waugh, A. Gettelman |
| 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 ; 8, no. 10 ; Nr. 8, no. 10 (2008-05-20), S.2643-2655 |
| Datensatznummer |
250006142
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| Publikation (Nr.) |
 copernicus.org/acp-8-2643-2008.pdf |
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| Zusammenfassung |
| Analysis of Atmospheric Infrared Sounder (AIRS) measurements for
five years shows significant longitudinal variations in the winter
subtropical upper tropospheric relative humidity (RH), not only in
the climatological mean values but also in the local distributions
and temporal variability. The largest climatological mean values
occur over the central-eastern Pacific and Atlantic oceans, where
there is also large day-to-day variability. In contrast, there are
smaller mean values, and smaller variability that occurs at lower
frequency, over the Indian and western Pacific oceans. These
differences in the distribution and variability of subtropical RH
are related to differences in the key transport processes in the
different sectors. The large variability and intermittent high and
low RH over the central-eastern Pacific and Atlantic oceans are due
to intrusions of high potential vorticity air into the
subtropics. Intrusions seldom occur over the eastern Indian and
western Pacific oceans, and here the subtropical RH is more closely
linked to the location and strength of subtropical
anticyclones. During northern winter there are eastward propagating
features in the subtropical RH in this region that are out of phase
with the tropical RH, and are caused by modulation of the
subtropical anticyclones by the Madden-Julian Oscillation. |
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