Seasonal variations in the vertical structure of water vapor optical depth in the lower troposphere over a tropical station |
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Authors: | P Ernest Raj P C S Devara |
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Institution: | Indian Institute of Tropical Meteorology, Pune-411008, India,Indian Institute of Tropical Meteorology, Pune-411008, India |
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Abstract: | Spatio-temporal variations of water vapor optical depth in the lower troposphere (450-3850 m) over Pune (18°32′N, 73°51/t’E,
559 m Above Mean Sea Level), India have been studied over a period of five years. The mean vertical structure showed that
the moisture content is greatest at the lowest level and decreases with increasing altitude, except in the south-west monsoon
season (June to September) where an increase upto 950 m has been found. Optical depths are maximum in the monsoon season.
The increase from pre-monsoon (March–May) to monsoon season in moisture content on an average is by about 58% in the above
altitude range. The temporal variations in surface Relative Humidity and optical depth at 450 m show positive correlation.
The amplitude of seasonal oscillation is the largest at 1465 m altitude. The time-height cross-sections of water vapor optical
depths in the lower troposphere showed a contrast between years of good and bad monsoon. |
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Keywords: | Optical depth Precipitable water |
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