| GPS可降水汽含量在强降雨过程中的特征分析 |
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| 引用本文： | 金鑫,施昆,陈云波,李建涛.GPS可降水汽含量在强降雨过程中的特征分析[J].全球定位系统,2018,43(2):65-71. |
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| 作者姓名： | 金鑫 施昆 陈云波 李建涛 |
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| 作者单位： | 1.昆明理工大学 国土资源工程学院,云南 昆明 650093 |
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| 摘 要： | 针对水汽在大气中易于变化,高时空分辨率水汽资料的欠缺,造成强降雨短时临近的预报水平不高的问题,探讨分析了GPS水汽反演的精度。利用香港CORS数据,通过GAMIT软件解算获得各测站1 h大气可降水量时间序列,将其与探空数据获得的液态水含量（PWV）和实际降水量进行比较分析。结果表明，GPS／PWV与Radio／PWV在整体变化趋势上具有很好的一致性,其相关系数大于0.9;GPS／PWV与Radio／PWV精度相当,两者平均偏差小于1 mm,均方根误差小于3 mm;GPS反演的大气可降水量与实际降水量具有较好的对应关系,能够精确地监测到水汽变化的过程,可以用于水汽的监测和预报研究。
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| 关 键 词： | GPS水汽反演 探空数据 大气可降水量(PWV) 实际降水量 GAMIT |
Analysis on the Characteristics of GPS Precipitable Water Vapor During Heavy Rainfall |
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| Institution: | 1.(1.Faculty of Land Resource Engineering, Kunming University of? Science and Technology, Kunming 650093, China2.2.Kunming Urban Planning and Information Center, Kunming 650500, China |
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| Abstract: | Aiming at the problem that due to the easy variability of water vapor in the atmosphere and the lack of the high temporal spatial resolution water vapor data, the forecast level of the storm is not high. The accuracy of GPS water vapor retrieval is analyzed and discussed. Using the data of CORS in Hong Kong, the time series of 1 hour atmospheric precipitable water vapor can be obtained by GAMIT software, and then compare it with the PWV obtained from sounding data and actual precipitation. The results show that: GPS／PWV and Radio／PWV has a very good consistency in the overall trend of change, and the correlation coefficient is greater than 09. The accuracy of GPS／PWV is matched with PWV obtained from sounding data, and the mean deviation is less than 1mm, and the root mean square error is less than 3mm. The atmospheric precipitable water vapor from GPS has a good correspondence with the actual precipitation,can accurately monitor the process of water vapor change and can be used for monitoring and forecasting water vapor. |
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