Abstract:
Precipitable water vapour is one of the variable atmospheric constituents and its short-term and seasonal variations may affect the infrared photometric observations. From the analysis of the measurements, made at Manora Peak, Naini Tal, 1981 November - 1983 December, of the total precipitable water vapour content in the atmosphere, the relative-humidity, and the temperature at ground level, it is concluded that the precipitable water vapour content is maximum during the months of May and June; and a minimum of 2.5 to 3.5 mm of precipitable water vapour content is observed during the winter observing season from November to March. The precipitable water vapour (mm) shows a poor correlation with the ground absolute humidity (gm/m/sup3/)
