In order to further improve the accuracy of global atmospheric detection and extreme weather forecasting,the paper proposed a retrieval method of zenith tropospheric delay from the constellation observing system for meteorology ionosphere and climate-2 (COSMIC-2) near real-time radio occultation profile:it was pointed that with the deepening of COSMIC-2 radio occultation (RO) detection depth,it became feasible to provide priori near-real-time zenith tropospheric delay (ZTD) products for ground-based global navigation satellite system (GNSS) observation stations through radio occultation ways;then,the retrieval ZTD obtained through the near-real-time COSMIC-2 Level 2 product wetPf2 was evaluated with the fifth reanalysis data of European Centre for Medium-Range Weather Forecasts (ERA5) as a reference,and the evaluation was conducted considering elevations,latitudes and seasons.Results showed that the overall accuracy of retrieval ZTD using COSMIC-2 would be high,and the overall accuracy for global positioning system (GPS) signal would be better than that of global navigation satellite system (GLONASS) signal under 10 km elevation;the accuracy of retrieval ZTD could be improved with increasing elevation,with the lowest accuracy in the range of 0～1 km elevation,where root mean square (RMS) would be 11.33 mm (GPS) and 11.54 mm (GLONASS);in the mid-low latitude range (25°N-35°N),the retrieval ZTD accuracy would be lower compared to low latitudes (15°N-25°N) and mid latitudes (35°N-45°N) regions,with the highest accuracy in the mid-latitude region,where RMS would be 4.74 mm (GPS) and 4.70 mm (GLONASS);moreover,the retrieval ZTD could be also affected by seasonal variations,with both GPS and GLONASS signals showing the worst accuracy in summer and the highest accuracy in winter (RMS:GPS 4.15 mm,GLONASS 4.18 mm).
constellation observing system for meteorology ionosphere and climate-2 (COSMIC-2)/global navigation satellite system (GNSS) near real-time radio occultation/zenith tropospheric delay/quality analysis
维普
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