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| Titel |
Comparison of Fast In situ Stratospheric Hygrometer (FISH) measurements of water vapor in the upper troposphere and lower stratosphere (UTLS) with ECMWF (re)analysis data |
| VerfasserIn |
A. Kunz, N. Spelten, P. Konopka, R. Müller, R. M. Forbes, H. Wernli |
| 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. 19 ; Nr. 14, no. 19 (2014-10-14), S.10803-10822 |
| Datensatznummer |
250119099
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| Publikation (Nr.) |
 copernicus.org/acp-14-10803-2014.pdf |
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| Zusammenfassung |
An evaluation of water vapor in the upper troposphere and lower stratosphere
(UTLS) of the ERA-Interim, the global atmospheric reanalysis produced by the
European Centre for Medium-Range Weather Forecasts (ECMWF), is presented.
Water vapor measurements are derived from the Fast In situ Stratospheric
Hygrometer (FISH) during a large set of airborne measurement campaigns from
2001 to 2011 in the tropics, midlatitudes and polar regions, covering
isentropic layers from 300 to 400K (5–18km).
The comparison shows around 87% of the reanalysis data are within a
factor of 2 of the FISH water vapor measurements and around 30% have
a nearly perfect agreement with an over- and underestimation lower than 10%.
Nevertheless, strong over- and underestimations can occur both in the UT and
LS, in particularly in the extratropical LS and in the tropical UT, where severe
over- and underestimations up to 10 times can occur.
The analysis data from the evolving ECMWF operational system is also
evaluated, and the FISH measurements are divided into time periods
representing different cycles of the Integrated Forecast System (IFS).
The agreement with FISH improves over the time, in particular when comparing
water vapor fields for time periods before 2004 and after 2010. It appears
that influences of tropical tropospheric and extratropical UTLS processes,
e.g., convective and quasi-isentropic exchange processes, are particularly
challenging for the simulation of the UTLS water vapor distribution.
Both the reanalysis and operational analysis data show the tendency of an
overestimation of low water vapor mixing ratio (⪅10ppmv)
in the LS and underestimation of high water vapor mixing ratio
(⪆300ppmv) in the UT. |
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