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Abstract
Precipitable water vapor (PWV) is a parameter that used to describe the water vapor content in the atmosphere has the potential to become a precipitation. Thus, it is important to measure PWV and investigate its trends and variability for potential forecasting precipitation. This study presents the variation of PWV at Tanay Upper Station (14°34’52.8”N, 121°22’08.9”E) from radiosonde operated by the Philippine Atmospheric, Geophysical and Astronomical Services Administration and at PIMO station (14°38’08.5”N, 121°04’39.4”E) using Global Navigation Satellite System (GNSS) operated by NASAJet Propulsion Laboratory under the International GNSS Service (IGS) network from 2015-2017. Moreover, there is no significant difference (p-values < 0.05) among PWV radiosonde, GNSS-PWV and rainfall as a function of year of observation. Monthly mean variation conforms to the Coronas climate classification, Climate Type I, in terms of the amount of precipitation. It is shown that PWV is high during wet months and least during dry months (November to April). Further, monthly mean variation is moderate correlated with surface temperature from radiosonde (R = +0.589). Evaporation rate depends on the surface temperature, which contributes in forming water vapor. The results showed that PWV from radiosonde gave reasonable values to be considered during wet and dry season as well as the seasonal variation of rainfall.
Highlights
Numerous scientific papers have studied the role of atmospheric water vapor content as a greenhouse gas [14]
It is shown that precipitable water vapor (PWV) is high during wet months and least during dry months (November to April)
Evaporation rate depends on the surface temperature, which contributes in forming water vapor
Summary
Numerous scientific papers have studied the role of atmospheric water vapor content as a greenhouse gas [14]. As the source of precipitation, water vapor is transport is crucial part in atmospheric water cycle [5]. Water vapor content makes up only 5% of the air is highly variable in its distribution; that is; it fluctuates seasonally and regionally [6]. Because of this, investigating water vapor to predict weather trends and climate changes becomes extremely difficult. Various instruments were developed to measure precipitable water vapor (PWV). It is defined as the height of liquid water result from condensing all the water vapor in a column from the surface to the top of the atmosphere [7]. One of the instruments used to measure PWV is the radiosonde
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