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| Titel |
Comparison of microwave satellite humidity data and radiosonde profiles: A survey of European stations |
| VerfasserIn |
V. O. John, S. A. Buehler |
| 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 ; 5, no. 7 ; Nr. 5, no. 7 (2005-07-25), S.1843-1853 |
| Datensatznummer |
250002985
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| Publikation (Nr.) |
 copernicus.org/acp-5-1843-2005.pdf |
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| Zusammenfassung |
| A method to compare upper tropospheric humidity (UTH) from
satellite and radiosonde data has been applied to the European
radiosonde stations. The method uses microwave data as a benchmark
for monitoring the performance of the stations. The present study
utilizes three years (2001-2003) of data from channel 18
(183.31±1.00 GHz) of the Advanced Microwave Sounding Unit-B
(AMSU-B) aboard the satellites NOAA-15 and NOAA-16. The comparison is
done in the radiance space, the radiosonde data were transformed to
the channel radiances using a radiative transfer model. The
comparison results confirm that there is a dry bias in the UTH
measured by the radiosondes. This bias is highly variable among the
stations and the years. This variability is attributed mainly to
the differences in the radiosonde humidity measurements. The
analysis also shows a difference between daytime and nighttime
soundings which is attributed to radiation error in the radiosonde
data. The dry bias due to this error alone correspond to
approximately 11% relative error in the UTH measurements. |
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