I am studying land surface processes using a Large Eddy Simulation model. I need data related to the land surface parameters, especially soil moisture at different depths, soil temperatures, root fraction etc. Where can I get these data from?
These data are available with meteorological observatories in ICAR institutes in India and many state agricultural universities. You can make a request to the observatory in charge and they will supply data on payment basis.
I think it will be difficult to get these important data from any organisation. Generally ICAR observatories do not estimate in-situ soil moisture at different depths.
Please use satellite soil moisture such as SMAP soil moisture profile data if 9 km spatial resolution is not too coarse for your study. You can also download in situ data from international soil moisture network, but only one station is available India. https://ismn.geo.tuwien.ac.at/en/data-access/
You can download the Indian soil data sets from the Bhuvan portal, under programs/ projects, National information system for climate and Environmental studies.