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| Titel |
Technical Note: 30 years of HIRS data of upper tropospheric humidity |
| VerfasserIn |
K. Gierens, K. Eleftheratos, L. Shi |
| 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 ; 14, no. 14 ; Nr. 14, no. 14 (2014-07-28), S.7533-7541 |
| Datensatznummer |
250118905
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| Publikation (Nr.) |
 copernicus.org/acp-14-7533-2014.pdf |
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| Zusammenfassung |
| We use 30 years of intercalibrated HIRS (High-Resolution Infrared
Radiation Sounder) data to produce a 30-year
data set of upper tropospheric humidity with respect to ice
(UTHi). Since the required brightness
temperatures (channels 12 and 6, T12 and T6) are
intercalibrated to different versions of the HIRS sensors (HIRS/2
and HIRS/4) it is necessary to convert the channel 6 brightness
temperatures which are intercalibrated to HIRS/4 into equivalent
brightness temperatures intercalibrated to HIRS/2, which is achieved
using a linear regression. Using the new regression coefficients we
produce daily files of UTHi, T12 and
T6, for each NOAA satellite and METOP-A (Meteorological Operational Satellite Programme), which carry the HIRS
instrument. From this we calculate daily and monthly means in
2.5° × 2.5° resolution for the northern
midlatitude zone 30–60° N. As a first application we
calculate decadal means of UTHi and the
brightness temperatures for the two decades 1980–1989 and
2000–2009. We find that the humidity mainly increased from the
1980s to the 2000s and that this increase is highly statistically
significant in large regions of the considered midlatitude belt.
The main reason for this result and its statistical significance is
the corresponding increase of the T12 variance. Changes of the
mean brightness temperatures are less significant. |
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