Estimation of surface temperature from MONTBLEX data

  • K Narahari Rao


It is observed that the daily mean temperature of the soil is linear with depth and the variation of the temperature is sinusoidal with a period of a day. Based on these observations the one-dimensional heat conduction equation for the soil can be solved which gives the amplitude and phase variation of the temperature wave with depth. Given the temperature data at three levels below the surface, the amplitude and phase variation and hence the surface temperature variation over the day are estimated. The daily mean temperature of the surface is estimated from linear extrapolation of the daily means at the three levels below the surface. Estimated values of soil thermal diffusivity show a subtantial change after sudden and heavy rains.


Soil and surface temperature diurnal variation phase and amplitude of temperature waves thermal difffusivity 


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  1. Kirkham D and Powers W L 1972 Advanced Soil Physics (Wiley Interscience)Google Scholar
  2. Rudra Kumar S, Srinivasan H P, Srikrishna R, Ameenulla S, Prabhu A (1991) Available tower data from MONTBLEX 1990, Rep 91 M D 1 CAS, IISc, Bangalore 12.Google Scholar

Copyright information

© Indian Academy of Sciences 1995

Authors and Affiliations

  • K Narahari Rao
    • 1
  1. 1.Centre for Atmospheric SciencesIndian Institute of ScienceBangaloreIndia

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