Abstract
Precipitable water vapor (PWV) is a parameter used to estimate water vapor content in the atmosphere. In this study, estimates of PWV from PIMO, PLEG and PPPC global navigation satellite system (GNSS) stations are evaluated regarding the PWV obtained from its collocated radiosonde (RS) stations. GNSS PWV were highly correlated with RS PWV (R ~ 0.97). Mean bias error (MBE) between −0.18 mm and −13.39 mm, and root mean square error (RMSE) between 1.86 mm and 2.29 mm showed a good agreement between GNSS PWV and RS PWV. The variations of PWV are presented. Daily variations of PWV conformed to the daily data of rainfall which agrees to the climate types of Quezon City (Type I), Legaspi (Type II), and Puerto Princesa (Type III) based on the Coronas climate classification. Moreover, PWV monthly variation at all sites is high from May to October (~62 mm) and low from November to April (~57 mm). The relationship between PWV and rainfall at all stations showed positive correlation coefficients between +0.49 to +0.83. Meanwhile, it is observed that when PWV is high (low), its variability is low (high). This study shows the potential of GNSS to study water vapor and its contribution to weather analysis.
Highlights
Atmospheric water vapor content is expressed in precipitable water vapor (PWV) and defined as the integrated amount of water vapor condensed in a vertical column from the surface to the top of the atmosphere [3]
Princesa and PPPC from 2015 to 2017. It shows that global navigation satellite system (GNSS) PWV corresponds with RS PWV
It can be observed that GNSS PWV estimates are generally higher than RS PWV
Summary
Water vapor is one of the essential components in the atmosphere since it transports moisture and latent heat to influence the weather [1]. Its impact on weather is significant, the distribution of atmospheric water vapor is highly fluctuating seasonally and diurnally [2]. Atmospheric water vapor content is expressed in precipitable water vapor (PWV) and defined as the integrated amount of water vapor condensed in a vertical column from the surface to the top of the atmosphere [3]. Conventional meteorological instruments, such as radiosonde [4–6] and GNSS [7–10] have been widely used to estimate PWV. The traditional approach in obtaining information from the atmosphere to measure
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