Assimilation of GNSS radio occultation observations in GRAPES
This paper reviews the development of the global navigation satellite system (GNSS) radio occultation (RO) observations assimilation in the Global/Regional Assimilation and PrEdiction System (GRAPES) of China Meteorological Administration, including the choice of data to assimilate, the data qua...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2014-11-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://www.atmos-meas-tech.net/7/3935/2014/amt-7-3935-2014.pdf |
| Summary: | This paper reviews the development of the global
navigation satellite system (GNSS) radio occultation (RO) observations
assimilation in the Global/Regional Assimilation and PrEdiction System
(GRAPES) of China Meteorological Administration, including the choice of
data to assimilate, the data quality control, the observation operator, the
tuning of observation error, and the results of the observation impact
experiments. The results indicate that RO data have a significantly positive
effect on analysis and forecast at all ranges in GRAPES, not only in the
Southern Hemisphere where conventional observations are lacking but also in
the Northern Hemisphere where data are rich. It is noted that a relatively
simple assimilation and forecast system in which only the conventional and
RO observation are assimilated still has analysis and forecast skill even
after nine months integration, and the analysis difference between both
hemispheres is gradually reduced with height when compared with NCEP
(National Centers for Environmental Prediction) analyses. Finally, as a
result of the new on-board payload of the Chinese FengYun-3 (FY-3)
satellites, the research status of the RO of FY-3 satellites is also
presented. |
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| ISSN: | 1867-1381 1867-8548 |