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| Titel |
The CM SAF SSM/I-based total column water vapour climate data record: methods and evaluation against re-analyses and satellite |
| VerfasserIn |
M. Schröder, M. Jonas, R. Lindau, J. Schulz, K. Fennig |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 3 ; Nr. 6, no. 3 (2013-03-19), S.765-775 |
| Datensatznummer |
250017846
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| Publikation (Nr.) |
 copernicus.org/amt-6-765-2013.pdf |
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| Zusammenfassung |
| The European Organisation for the Exploitation of Meteorological
Satellites (EUMETSAT) Satellite Application Facility on Climate Monitoring
(CM SAF) aims at the provision and sound validation of well documented
Climate Data Records (CDRs) in sustained and operational environments. In
this study, a total column water vapour path (WVPA) climatology from CM SAF is
presented and inter-compared to water vapour data records from various data
sources. Based on homogenised brightness temperatures from the Special
Sensor Microwave Imager (SSM/I), a climatology of WVPA has been generated
within the Hamburg Ocean–Atmosphere Fluxes and Parameters from Satellite
(HOAPS) framework. Within a research and operation transition activity the
HOAPS data and operation capabilities have been successfully transferred to
the CM SAF where the complete HOAPS data and processing schemes are hosted
in an operational environment. An objective analysis for interpolation, namely
kriging, has been applied to the swath-based WVPA retrievals
from the HOAPS data set. The resulting climatology consists of daily and
monthly mean fields of WVPA over the global ice-free ocean. The temporal
coverage ranges from July 1987 to August 2006. After a comparison to the
precursor product the CM SAF SSM/I-based climatology has been
comprehensively compared to different types of meteorological analyses from
the European Centre for Medium-Range Weather Forecasts (ECMWF-ERA40, ERA
INTERIM and operational analyses) and from the Japan Meteorological Agency
(JMA–JRA). This inter-comparison shows an overall good agreement between
the climatology and the analyses, with daily absolute biases generally
smaller than 2 kg m−2. The absolute value of the bias to JRA and ERA INTERIM is
typically smaller than 0.5 kg m−2. For the period 1991–2006, the root
mean square error (RMSE) for both reanalyses is approximately 2 kg m−2.
As SSM/I WVPA and radiances are assimilated into JMA and all ECMWF analyses
and to assess consistency with existing WVPA climatologies, the SSM/I-based
climatology is also compared to the time series of SSM/I and TMI (Tropical Rainfall Measuring Mission Microwave Imager) WVPA from Remote
Sensing Systems (RSS), leading to results consistent with the reanalyses
results. This evaluation study gives confidence in consistency, accurateness
and stability of the total water vapour climatology produced. |
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