Indian Forum for Water Adroit

High-resolution gridded soil moisture and soil temperature datasets for the Indian monsoon region

Pankaj Dey

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  • Institute : Indian Institute of Science
  • Programming language : MATLAB, R
High-resolution soil moisture/temperature (SM/ST) are critical components of the growing demand for fine-scale products over the Indian monsoon region (IMR) which has diverse land-surface characteristics. This demand is fueled by findings that improved representation of land-state help improve rainfall/flood prediction. Here we report on the development of a high-resolution (4 km and 3 hourly) SM/ST product for 2001–2014 during Indian monsoon seasons (June–September). First, the quality of atmospheric fields from five reanalysis sources was examined to identify realistic forcing to a land data assimilation system (LDAS). The evaluation of developed SM/ST against observations highlighted the importance of quality forcing fields. There is a significant relation between the forcing error and the errors in the SM/ST. A combination of forcing fields was used to develop 14-years of SM/ST data. This dataset captured inter-annual, intra-seasonal, and diurnal variations under different monsoon conditions. When the mesoscale model was initialized using the SM/ST data, improved simulations of heavy rain events was evident, demonstrating the value of the data over IMR.

Link to paper: https://www.nature.com/articles/sdata2018264

Link to data: https://figshare.com/articles/High-resolution_gridded_soil_moisture_and_soil_temperature_datasets_for_the_Indian_monsoon_region/6884657
Pankaj