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| Titel |
Validation of refractivity profiles derived from GRAS raw-sampling data |
| VerfasserIn |
F. Zus, G. Beyerle, S. Heise, T. Schmidt, J. Wickert, C. Marquardt |
| 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 ; 4, no. 7 ; Nr. 4, no. 7 (2011-07-27), S.1541-1550 |
| Datensatznummer |
250002061
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| Publikation (Nr.) |
 copernicus.org/amt-4-1541-2011.pdf |
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| Zusammenfassung |
| Results from GRAS (GNSS Receiver for Atmospheric Sounding) RO (Radio
Occultation) data recorded in RS (Raw Sampling) mode processed at the GFZ
(German Research Centre for Geoscience) Potsdam are presented. The
experimental processing software POCS-X includes FSI (Full Spectrum
Inversion) in order to cope with multi-path regions and enables in connection
with RS data to retrieve atmospheric refractivity profiles down to the
Earths surface. Radio occultation events observed between 30 September
and 30 October 2007 are processed and the retrievals are validated
against co-located ECMWF (European Centre for Medium-Range Weather Forecasts)
profiles. The intercomparison indicates good quality of the retrieved
profiles. In the altitude range 8 to 25 km the standard deviation is
below 1 %. The mean deviation in this altitude range tends to be negative.
At 30 km the negative bias reaches about −0.4 %. Below 8 km the
standard deviation increases, reaching 2.5 % at 2 km. Below 2 km the
mean deviation tends to be negative, reaching −1.9 % close to the ground.
The negative bias mainly stems from the tropical lower troposphere; there,
the negative bias reaches −3 %. The tropospheric penetration depth obtained
from RS data shows a vast improvement compared to the tropospheric
penetration depth typically obtained from CL (Closed Loop) data; 50 % of
all retrieved profiles reach 720 m. |
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