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| Titel |
Implementation of a GPS-RO data processing system for the KIAPS-LETKF data assimilation system |
| VerfasserIn |
H. Kwon, J.-S. Kang, Y. Jo, J. H. Kang |
| 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 ; 8, no. 3 ; Nr. 8, no. 3 (2015-03-16), S.1259-1273 |
| Datensatznummer |
250116215
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| Publikation (Nr.) |
 copernicus.org/amt-8-1259-2015.pdf |
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| Zusammenfassung |
| The Korea Institute of Atmospheric Prediction Systems (KIAPS) has been
developing a new global numerical weather prediction model and an advanced
data assimilation system. As part of the KIAPS package for observation
processing (KPOP) system for data assimilation, preprocessing, and quality
control modules for bending-angle measurements of global
positioning system radio occultation (GPS-RO) data have been implemented and
examined. The GPS-RO data processing system is composed of several steps for
checking observation locations, missing values, physical values for Earth
radius of curvature, and geoid undulation. An observation-minus-background
check is implemented by use of a one-dimensional observational bending-angle
operator, and tangent point drift is also considered in the quality control
process. We have tested GPS-RO observations utilized by the Korean
Meteorological Administration (KMA) within KPOP, based on both the KMA
global model and the National Center for Atmospheric Research
Community Atmosphere
Model with Spectral Element dynamical core (CAM-SE) as a model background.
Background fields from the CAM-SE model are incorporated for the preparation
of assimilation experiments with the KIAPS local
ensemble transform Kalman filter (LETKF) data assimilation system,
which has been successfully implemented to a cubed-sphere model with
unstructured quadrilateral meshes. As a result of data processing, the
bending-angle departure statistics between observation and background show
significant improvement. Also, the first experiment in assimilating GPS-RO
bending angle from KPOP within KIAPS-LETKF shows encouraging results. |
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