ABSTRACT This paper reported the tropospheric precipitable water vapor (PWV) validation as an essential tool for solar-climate studies over tropical region. The PWV is measured using a ground-based GPS receiver and the surface meteorological sensors. Validation of GPS PWV with radiosonde PWV along 3-week observation in November 2009 over UKM Bangi, Malaysia showed a similar trend with correlation coefficient 0.79, significantly at the 99% confidence level. The GPS PWV rate was measured lower below 1% than the radiosonde PWV and has similar characters. This implies that GPS PWV agreed very well with twice a day of radiosonde data that can be employed to monitor atmospheric variability as well as climate studies.
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