Abstract
Due to global warming, a drying and warming trend has been observed over the last 30 years in Tamil Nadu, India, which could significantly affect the condensation of vapor in surfaces. The seasonal (October to February) dew events for the year 1998-99 recorded the highest (86) while 2019-20 registered the lowest (34) value which might be due to obstructed cloud cover that have resulted in warmer nights prevailed in the region. The monthly dew deposition was found to be higher during October and November where the value of 0.21mm and 0.27mm was realized. The Mann- Kendal test revealed that during the months of December, January and February decrease in dew deposition was observed at the rate of -1.8mm (significant at 1 per cent level), -2.8 mm (significant at 10 per cent level) and -2.2 mm (significant at 5 per cent level) . Interestingly, during may month, the dew deposition showed an increase in trend of 1.8 mm (significant at 1 per cent level) for Coimbatore district of Tamil Nadu.
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