区域GPS网对流层延迟直接推算可降水量研究

THE STUDY OF DIRECTLY CALCULATING PRECIPITABLE WATER VAPOR WITH ZENITH TROPOSPHERIC DELAY OF GPS NETWORK

关键词:  对流层延迟  可降水量  GPS气象网

Key words:  tropospheric zenith delay  precipitable water vapor  GPS Meteorology Network

摘要:

针对武汉地区GPS气象网资料进行GPS对流层延迟直接推算可降水量的研究。推导了对流层延迟直接推算可降水量的模型,并对模型结果进行检验。从武汉东湖站GPS对流层延迟与无线电探空可降水量的比较中可知,两者具有很好的相关性,相关系数达到0.931;由该站对流层延迟转换的可降水量与无线电探空可降水量的比较可得,均方根为4.45mm,相关系数为0.905,对流层延迟转换的可降水量与GPS可降水量的均方根为2.23mm,相关系数为0.988。说明在没有气象数据的地区,对流层延迟直接推算的可降水量可以作为气象短期预报的参考依据。

Abstract:

With the data of GPS Meteorology Network in the region of Wuhan,the article discusses the study of directly calculating precipitable water vapor with GPS zenith tropospheric delay.Comparisons of radiosonde precipitable water vapor and GPS zenith tropospheric delay at the Donghu station of Wuhan indicate good correlation between them with the correlative coefficient at 0.931.A model of directly calculating precipitable water vapor is derived and the model results are proof-tested.The root mean square of GPS precipitable water vapor and radiosonde is 4.45 mm and the correlative coefficient is 0.901 in the comparison between the precipitable water vapor of zenith tropospheric delay and radiosonde data.The root mean square is 2.23 mm and the correlative coefficient is 0.988 in the comparison between the precipitable water vapor of zenith tropospheric delay and GPS/PWV.It is shown that the precipitable water vapor of zenith tropospheric delay can be considered as the reference of short-range forecast in regions without meteorological data.