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

Agrawal, S and Chakraborty, A (2020) Evaluation of ESACCI satellite soil moisture product using in-situ CTCZ observations over India. In: Journal of Earth System Science, 129 (1).

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Official URL: https://dx.doi.org/10.1007/s12040-020-01384-2


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 (m3m-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.

Item Type: Journal Article
Publication: Journal of Earth System Science
Publisher: Springer
Additional Information: Copy right for this article belongs to Springer
Keywords: accuracy assessment; data set; monsoon; seasonal variation; sensor; soil moisture, India
Department/Centre: Division of Mechanical Sciences > Divecha Centre for Climate Change
Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited: 30 Sep 2020 07:12
Last Modified: 30 Sep 2020 07:12
URI: http://eprints.iisc.ac.in/id/eprint/65693

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