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Home arrow Geography arrow Observed Climate Variability and Change over the Indian Region
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Results and Discussion

All India Trends

Specific Humidity

All India averaged annual mean SPH is 14.3 g/kg which is increasing significantly at the 95 % confidence level of confidence by +0.25 g/kg per decade during the period of 1969-2012 as shown in Fig. 2a. Country averaged seasonal means of SPH is the highest (18.5 g/kg) in monsoon season and the lowest (9.9 g/kg) in the winter season. On the seasonal scale, trends in SPH are significantly increasing for all the seasons, Fig. 2b-e. The magnitude of seasonal trends in SPH is the highest in summer, where it is increasing at the rate +0.32 g/kg per decade and the lowest in monsoon season where the rate of increase is +0.20 g/kg per decade. Temporal variations in annual mean SPH during the study period indicate the highest value 15.2 g/kg in 1998 and the lowest 13.3 g/kg in 1972. Similarly, seasonal mean values of SPH are also the highest in 1998 and the lowest in 1972 as shown in Fig. 2.

Relative Humidity

All India averaged annual mean RH is 64.5 % which is increasing significantly at the 95 % confidence level of confidence at the rate +0.79 % per decade during the period of 1969-2012 as shown in Fig. 3 a. Country averaged seasonal means of RH is the highest (74.9 %) in monsoon season and the lowest (52.2 %) in the pre-monsoon season. On seasonal scale, trends in RH are significantly positive for all the seasons except for the monsoon season as shown in Fig. 3b-e. The magnitude of seasonal trends in RH is the highest in winter, where it is increasing at the rate +1.25 % per decade and the lowest in monsoon season where the rate of increase is +0.27 % per decade. Temporal variations in annual mean RH during the study period indicate the highest value of 67.4 % in 1972 and lowest 60.7 % in 1998 as shown in Fig. 3a. Winter season mean RH value is the highest (67.4 %)in 1998 and the lowest (55.3 %) in 1969. Summer season mean RH value is the highest (55.8 %) in 2012 and the lowest (48.6 %) in 1975. Monsoon season mean RH value is the highest (77.0 %) in 2011 and the lowest (70.2 %) in 1972. Post-monsoon season mean RH value is the highest (72.3 %) in 1997 and the lowest (62.3 %) in 1984.

 
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