• Evaluation of ESACCI satellite soil moisture product using in-situ CTCZ observations over India

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      https://www.ias.ac.in/article/fulltext/jess/129/0129

    • Keywords

       

      ESACCI soil moisture; CTCZ ground-based soil moisture; validation; Indian region

    • Abstract

       

      Recently available European Space Agency Climate Change Initiative (ESACCI) soil moisture dataset, derived by merging soil moisture values calculated using measurements from satellite-based active and passive sensors, is validated over the Indian region using in-situ observations from 117 Continental Tropical Convergence Zone (CTCZ) Programme stations spread across India. The dataset is compared for the monsoon season (June–September: JJAS) of two years – 2011–2012, over six regional domains which differ in soil characteristics and mean soil moisture values, thus taking the spatial heterogeneity into account. Evaluation shows that the mean JJAS ESACCI volumetric soil moisture is $25.5% (\rm{m^{3} m^{-3}})$, with an intra-seasonal standard deviation of 6%. The root mean squared difference (RMSD) between ESACCI soil moisture product and CTCZ observations is 10% over the Indian region. Over smaller homogeneous regions, the RMSD values between the two products are smaller than 5%, except over southern India and north-east India. Overall, the ESACCI soil moisture dataset is in good agreement with the CTCZ in-situ soil moisture observations, and has relatively higher accuracy over the plains of northern and central India, as compared to other regions. However, the ESACCI soil moisture dataset shows higher intra-seasonal variability at shorter time-scale of 2–4 days, as compared to the CTCZ observations, possibly due to the difference in the soil sampling depths between the two datasets.

    • Author Affiliations

       

      SHUBHI AGRAWAL1 2 3 ARINDAM CHAKRABORTY1 2

      1. Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore, India.
      2. Divecha Centre for Climate Change, Indian Institute of Science, Bangalore, India.
      3. Present address: Atmospheric Sciences Research Center, University at Albany, State University of New York, Albany, NY, USA.
    • Dates

       
  • Journal of Earth System Science | News

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