• Variability of soil moisture and its relationship with surface albedo and soil thermal diffusivity at Astronomical Observatory, Thiruvananthapuram, south Kerala

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    • Keywords

       

      Soil moisture; rainfall; surface albedo; solar elevation angle; thermal diffusivity; atmospheric sciences; meteorology; geophysics.

    • Abstract

       

      Continuous observation data collected over the year 2008 at Astronomical Observatory, Thiruvananthapuram in south Kerala (76° 59′E longitude and 8° 30′N latitude) are used to study the diurnal, monthly and seasonal soil moisture variations. The effect of rainfall on diurnal and seasonal soil moisture is discussed. We have investigated relationships of soil moisture with surface albedo and soil thermal diffusivity. The diurnal variation of surface albedo appears as a U-shaped curve on sunny days. Surface albedo decreases with the increase of solar elevation angle, and it tends to be a constant when solar elevation angle is greater than 40°. So the daily average surface albedo was calculated using the data when solar elevation angle is greater than 40°. The results indicate that the mean daily surface albedo decreases with increases in soil moisture content, showing a typical exponential relation between the surface albedo and the soil moisture. Soil thermal diffusivity increases firstly and then decreases with the increase of soil moisture.

    • Author Affiliations

       

      M S Roxy1 V B Sumithranand1 G Renuka1

      1. Department of Physics, University of Kerala, Kariavattom, Thiruvananthapuram 695 581, India.
    • Dates

       
  • Journal of Earth System Science | News

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