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Moisture Content

The analysis of surface moisture and soil moisture data has been made using the

data of 1969-2012.

  • 1. The all-India averaged specific humidity shows significant increasing trend during all the seasons, which is consistent with the surface warming trends.
  • 2. The magnitude of seasonal trends in specific humidity 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.
  • 3. The regional re-analysis data sets suggest an increase in atmospheric moisture content over the region during the same period.
  • 4. Out of 27 stations considered for soil moisture analysis, 15 stations showed increasing trends in soil moisture.

Radiative Fluxes

The analysis on surface and top of the atmosphere radiative fluxes over the region is

made using the data of the period 1981-2010.

  • 1. The analysis of global irradiance data from India, from 1981 to 2006 showed a significant decreasing trend of 0.89 Wm-2 yr-1 under all sky conditions, called solar/global dimming.
  • 2. The analysis of long-term global irradiance data from 1971 to 2010 showed that the declining trend of all-sky global irradiance over India as a whole was 0.6 Wm-2yr-1 during 1971-2000 and 0.2 Wm-2yr-1 during 2001-2010.
  • 3. There is an indication of solar brightening after 2001, consistent with the decrease in total cloud cover.
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