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GPS探测与FY-2反演大气可降水量对比分析
(海南省人工影响天气中心)
The Comparison of Precipitable Water Derived by FY-2 Satellite and GPS Observations
LI Guangwei1, HUANG Yanbin2, AO Jie2, XING Fenghua2, MAO Zhiyuan2
(1.Hainan Institute of Meteorological Sciences;2.Weather Modification Center of Hainan Province)
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投稿时间:2017-03-08    修订日期:2018-04-10
中文摘要: 为深入了解FY-2卫星大气可降水量(PW)的反演质量,本文选取2012年和2015年地基GPS水汽观测数据,与FY-2 PW反演产品进行了对比分析。结果表明:(1)北京、武汉和海口三站GPS PW与FY-2 PW在夏季存在显著正相关,三站的相关系数都达到0.67以上,夏季PW的均方根误差值、月均值偏差绝对值均小于冬季。北京、武汉与拉萨站PW平均偏差和RMSE在四季均具有明显日变化特征;(2)当GPS PW>20mm时,北京、武汉、海口和拉萨FY-2 PW与GPS PW比较一致,PW偏差均值的绝对值和均方根误差较小,当GPS PW<20mm时,PW偏差均值绝对值和均方根误差随GPS PW值减小而迅速变大。FY-2 PW产品在夏季可以为大部分区域提供高时空分辨率高精度的大气可降水量,在大气湿度非常低、冬季和夜间条件,反演结果精度有待提高。
Abstract:In order to understand better the quality of precipitable water derived from FY-2 satellite data(FY-2 PW), a comparison is presented in this study between the FY-2 PW and GPS PW in 2012 and 2015. The results indicate that: (1)The two datasets are highly correlated in three stations(Beijing,Wuhan and Haikou) with correlation coefficients more than 0.67 in summer. The values of PW RMSE and monthly mean bias are less in summer than in winter.The bias and RMSE of PW for four seasons exhibited a pronounced diurnal variation in Beijing , Wuhan and Lhasa stations. (2)When the value of GPS PW is greater than 20mm , FY-2 PW agrees well with GPS PW in Beijing,Wuhan,Haikou and Lhasa stations. On the other hand, when the value of GPS PW is within 20mm, the absolute value of PW bias and root mean square error quickly increase with the decrease of GPS PW. All the results show that the accuracy of FY-2 PW tends to be high in summer, but the retrieval results of FY-2 PW all need to improve in the conditons of low atmospheric humidity value, winter, night.
文章编号:201703080149     中图分类号:P412.27    文献标志码:
基金项目:海南省财政科技计划项目(417299)、海南省气象局科技创新项目(HN2013MS15)、公益性行业(气象)科研专项(GYHY201406033-04)和中国气象局华南区域气象科技攻关项目(GRMC2014M15)共同资助
引用文本:
李光伟,黄彦彬,敖杰,邢峰华,毛志远,0.[en_title][J].Meteor Mon,():-.
LI Guangwei,HUANG Yanbin,AO Jie,XING Fenghua,MAO Zhiyuan,0.The Comparison of Precipitable Water Derived by FY-2 Satellite and GPS Observations[J].Meteor Mon,():-.