Determining the precipitable water vapor thresholds under different rainfall strengths in Taiwan

Yeh, T, Shih, H, Choy, S, Chen, C and Hong, J 2018, 'Determining the precipitable water vapor thresholds under different rainfall strengths in Taiwan', Advances in Space Research, vol. 61, no. 3, pp. 941-950.


Document type: Journal Article
Collection: Journal Articles

Title Determining the precipitable water vapor thresholds under different rainfall strengths in Taiwan
Author(s) Yeh, T
Shih, H
Choy, S
Chen, C
Hong, J
Year 2018
Journal name Advances in Space Research
Volume number 61
Issue number 3
Start page 941
End page 950
Total pages 10
Publisher Pergamon Press
Abstract Precipitable Water Vapor (PWV) plays an important role for weather forecasting. It is helpful in evaluating the changes of the weather system via observing the distribution of water vapor. The ability of calculating PWV from Global Positioning System (GPS) signals is useful to understand the special weather phenomenon. In this study, 95 ground-based GPS and rainfall stations in Taiwan were utilized from 2006 to 2012 to analyze the relationship between PWV and rainfall. The PWV data were classified into four classes (no, light, moderate and heavy rainfall), and the vertical gradients of the PWV were obtained and the variations of the PWV were analyzed. The results indicated that as the GPS elevation increased every 100 m, the PWV values decreased by 9.5 mm, 11.0 mm, 12.2 mm and 12.3 mm during the no, light, moderate and heavy rainfall conditions, respectively. After applying correction using the vertical gradients mentioned above, the average PWV thresholds were 41.8 mm, 52.9 mm, 62.5 mm and 64.4 mm under the no, light, moderate and heavy rainfall conditions, respectively. This study offers another type of empirical threshold to assist the rainfall prediction and can be used to distinguish the rainfall features between different areas in Taiwan.
Subject Meteorology
Keyword(s) GPS
Ground-based
Precipitable water vapor
Rainfall threshold
Vertical gradient
DOI - identifier 10.1016/j.asr.2017.11.002
Copyright notice © 2017 COSPAR. Published by Elsevier
ISSN 0273-1177
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