Preliminary validation of the refractivity from the new radio occultation sounder GNOS/FY-3C
Preliminary validation of the refractivity from the new radio occultation sounder GNOS/FY-3C
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DOI：
10.5194/amt-9-781-2016
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发表时间：
2016-03
影响因子：
3.8
通讯作者：
M. Liao;Peng Zhang;Guanglin Yang;Y. Bi;Yan Liu;W. Bai;X. Meng;Q. Du;Yueqiang Sun
中科院分区：
文献类型：
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作者：
M. Liao;Peng Zhang;Guanglin Yang;Y. Bi;Yan Liu;W. Bai;X. Meng;Q. Du;Yueqiang Sun
抽象的。作为天基无线电掩星探测仪的新成员，安装在风云三号(风云三号)上的GNOS(全球导航卫星系统掩星探测仪)自2013年9月23日开始进行大气探测。GNOS每天使用GPS(全球定位系统)和中国的BDS(北斗导航卫星)信号进行大约800次测量。在这项工作中，比较了GNOS的大气折射率廓线与共同定位的ECMWF(欧洲中期天气预报中心)再分析的结果。通过GNOS GPS(BDS)获得的折射率从近地表到46公里的平均偏差约为−0.09%(−0.04%)。平均标准偏差约为1.81%(1.26%)，而在5-25公里范围内的平均标准偏差低至0.75%(0.53%)，这是通常获得最佳探测结果的地方。此外，将COSMIC(气象、电离层和气候星座观测系统)和MetOp/GRAS(全球导航卫星系统大气探测接收器)无线电掩星数据与ECMWF再分析进行了比较，所得结果可作为GNOS的参考数据。结果表明，GNOS/FY-3C型测深仪在精度和精度方面均达到了设计要求。它在0-30公里的垂直范围内具有与COSMIC和MetOp/GRAS类似的探测能力，但在30公里以上还需要进一步改进。总体而言，它为全球数值天气预报(NWP)社区提供了一个新的数据源。
Abstract. As a new member of the space-based radio occultation sounders, the GNOS (Global Navigation Satellite System Occultation Sounder) mounted on Fengyun-3C (FY-3C) has been carrying out atmospheric sounding since 23 September 2013. GNOS takes approximately 800 daily measurements using GPS (Global Positioning System) and Chinese BDS (BeiDou navigation satellite) signals. In this work, the atmospheric refractivity profiles from GNOS were compared with the ones obtained from the co-located ECMWF (European Centre for Medium-Range Weather Forecasts) reanalysis. The mean bias of the refractivity obtained through GNOS GPS (BDS) was found to be approximately −0.09 % (−0.04 %) from the near surface to up to 46 km. While the average standard deviation was approximately 1.81 % (1.26 %), it was as low as 0.75 % (0.53 %) in the range of 5–25 km, where best sounding results are usually achieved. Further, COSMIC (Constellation Observing System for Meteorology, Ionosphere and Climate) and MetOp/ GRAS (GNSS Receiver for Atmospheric Sounding) radio occultation data were compared with the ECMWF reanalysis; the results thus obtained could be used as reference data for GNOS. Our results showed that GNOS/FY-3C meets the design requirements in terms of accuracy and precision of the sounder. It possesses a sounding capability similar to COSMIC and MetOp/GRAS in the vertical range of 0–30 km, though it needs further improvement above 30 km. Overall, it provides a new data source for the global numerical weather prediction (NWP) community.