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| Titel |
Evaluation of wet troposphere path delays from atmospheric reanalyses and radiometers and their impact on the altimeter sea level |
| VerfasserIn |
J.-F. Legeais, M. Ablain, S. Thao |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 10, no. 6 ; Nr. 10, no. 6 (2014-11-10), S.893-905 |
| Datensatznummer |
250117091
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| Publikation (Nr.) |
 copernicus.org/os-10-893-2014.pdf |
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| Zusammenfassung |
| The assessment of long-term errors in altimeter sea level measurements is
essential for studies related to the mean sea level (MSL) evolution. One of
the main contributors to the long-term sea level uncertainties is the
correction of the altimeter range from the wet troposphere path delay, which
is provided by onboard microwave radiometers for the main altimeter missions.
The wet troposphere correction (WTC) derived from the operational European
Centre for Medium-Range Weather Forecast (ECMWF) atmospheric model is usually
used as a reference for comparison with the radiometer WTC. However, due to
several improvements in the processing, this model is not homogenous over the
altimetry period (from 1993 onwards), preventing the detection of errors in
the radiometer WTC, especially in the first altimetry decade. In this study,
we determine the quality of WTC provided by the operational ECMWF atmospheric
model in comparison with the fields derived from the ERA-Interim (ECMWF) and
the National Centers for Environmental Predictions/National Center for
Atmospheric Research (NCEP/NCAR) reanalyses. Separating our analyses on
several temporal and spatial scales, we demonstrate that ERA-Interim provides
the best modeled WTC for the altimeter sea level at climate scales. This
allows us to better evaluate the radiometer WTC errors, especially for the
first altimetry decade (1993–2002), and thus to improve the altimeter MSL
error budget. This work also demonstrates the relevance of the interactions
between the "altimetry" and "atmosphere" communities, since the expertise
of each is of benefit to the other. |
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