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| Titel |
Improvement metrics for water vapour and temperature profiles retrieved from GPS RO profiles through 1D-Var. |
| VerfasserIn |
J. K. Nielsen, K. B. Lauritsen, K. Kinch |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250067167
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| Zusammenfassung |
| Wave optical retrieval of GPS RO profiles are known to give a better estimate of bending
angle and refractivity profiles in the lower troposphere than geometric optics can provide.
Here we analyse the GRAS raw sampling dataset from METOP from October 2007, with
good representation of the lower troposphere. We process all profiles with both the wave
optics and geometric optics methods. The resulting refractivity profiles are inverted to
temperature, humidity and surface pressure state vectors by using the 1D-Var method, with
background states interpolated from the ECMWF forecast. We use the same error covariance
matrices for the two retrieval methods. In order to describe the difference in performance of
wave optics versus geometric optics we investigate standard information measures to quantify
the partitioning of information from observation and background data in the solution profiles. |
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