Real‐time retrieval of precipitable water vapor from GPS precise point positioning

Content Provider	Semantic Scholar
Author	Yuan, Yubin Zhang, Kefei Rohm, Witold Choy, Suelynn Norman, Robert J. Wang, Chuan-Sheng
Copyright Year	2014
Abstract	Sensing of precipitable water vapor (PWV) using the Global Positioning System (GPS) has been intensively investigated in the past 2 decades. However, it still remains a challenging task at a high temporal resolution and in the real-time mode. In this study the accuracy of real-time zenith total delay (ZTD) and PWV using the GPS precise point positioning (PPP) technique is investigated. GPS observations in a 1 month period from 20 globally distributed stations are selected for testing. The derived real-time ZTDs at most stations agree well with the tropospheric products from the International Global Navigation Satellite Systems Service, and the root-mean-square errors (RMSEs) are <13 mm, which meet the threshold value of 15 mm if ZTDs are input to numerical weather prediction models. The RMSE of the retrieved PWVs in comparison with the radiosonde-derived values are <= 3 mm, which is the threshold RMSE of PWVs as inputs to weather nowcasting. The theoretical accuracy of PWVs is also discussed, and 3 mm quality of PWVs is proved achievable in different temperature and humidity conditions. This implies that the real-time GPS PPP technique can be complementary to current atmospheric sounding systems, especially for nowcasting of extreme weather due to its real-time, all-day, and all-weather capabilities and high temporal resolutions.
Starting Page	10044
Ending Page	10057
Page Count	14
File Format	PDF HTM / HTML
DOI	10.1002/2014JD021486
Alternate Webpage(s)	https://researchbank.rmit.edu.au/eserv/rmit:161611/Yuan.pdf
Alternate Webpage(s)	https://doi.org/10.1002/2014JD021486
Volume Number	119
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article