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检索条件"主题词=slant water vapor"

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Observation on anisotropy in moisture distribution with GPS during the passage of a squall line

Observation on anisotropy in moisture distribution with GPS ...

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2011年海峡两岸气象科学技术研讨会

作者： Yanli Chu Chaolin Zhang YingHwa Kuo John Braun Hongyan Liu Jingjiang Zhang Ju Li Constellation Observing System for Meteorology Ionosphere ＆ Climate（COSMIC） University Corporation for Atmospheric Research（UCAR）!BoulderColoradoUSA

＜正＞slant water vapor（SWV） measurements from a ground-based global positioning system（GPS） instrument can provide accurate,high temporal-resolution and multi-directional water vapor information for moisture variation *** this study,the preliminary comparison for GPS SWV measurements against water vapor radiometer（WVR） shows that GPS SWV measurements are *** compared vertical SWV（VSWV） observations against precipitable water vapor（PWV） measurements from a GPS receiver located at the south of Beijing（54511 station） during the passage of a squall *** found that VSWV observations display more variations than PWV measurements in moisture *** also compared the temporal difference of VSWV observations between individual GPS *** found obvious spatial anisotropy in moisture distribution during the passage of the squall *** results suggest that SWV observations are very valuable in the analysis and construction of accurate moisture distribution.

关键词： Global Positioning System water vapor radiometer slant water vapor precipitable water vapor squall line

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The Research on Four-dimensional water vapor Tomography Based on Real-time PPP Technique

The Research on Four-dimensional Water Vapor Tomography Base...

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第七届中国卫星导航学术年会

作者： Qingzhi Zhao Yibin Yao Chaoqian Xu School of geodesy and geomatics Wuhan University

With the development of International GNSS Service(IGS) real-time pilot project(RTPP),acquiring Precipitable water vapor(PWV) with high accuracy has become a reality based on the real-time Precise Point Pointing(RT-PPP) technique. The accuracy of Zenith Total Delay(ZTD) and PWV derived from RT-PPP have been validated using observed Global Positioning System(GPS) data and meteorology data from Satellite Positioning Reference Station Network(SatR ef) in 2014. The ZTD comparison with that from afterwards PPP and GAMIT software shows that the relative coefficients are 0.9786 and 0.9687,respectively. The PWV comparison with that from radiosonde shows that the relative coefficient and RMS are 0.9512 and 2.13 mm,respectively. It is a clear evidence that the RT-PPP technique has a similar accuracy with the result calculated using afterwards IGS products. However,PWV is a mean of water vapor information of many GNSS signal rays during a period of time over the station,which cannot reflect the three-dimensional water vapor distribution. slant water vapor(SWV)can be obtained by mapping PWV at different elevation and azimuth angles. The tomographic experiment has been performed using SWVs of twelve station from SatR ef as tomographic observation and compared with result from radiosonde. The comparison shows a good agreement and the RMS,SD,Bias and MAE of Integrated water vapor(IWV) are 3.60 mm,2.78 mm,2.29 mm and 2.92 mm,respectively,the Root Mean Square(RMS),Standard Deviation(SD),Bias and Mean Absolute Error(MAE) of calculated water vapor density are 1.08 g/m,1.03 g/m,-0.21 g/m and 0.77 g/m,respectively. The above result makes it possible that acquiring the real-time three-dimensional water vapor distribution using tomography approach with SWVs derived from RT-PPP technique,which has an important influence on short-term disastrous weather and now-casting precipitation forecasting.

关键词： IGS Real-time pilot project Real-time PPP technique slant water vapor Tomography approach

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