Hi Sonali Sharma

If you are aiming for land use and cover studies with moderate spatial resolution. You can use remote sensing products with higher spatial resolution than ERA-5 (if I am not wrong, it has 30 km spatial resolution).

My choices would be

For evapotranspiration: MOD16A2 Version 6 Evapotranspiration/Latent Heat Flux product

For Rainfall: CHIRPS, https://www.chc.ucsb.edu/data/chirps

For Temperature: MOD11A2 or MYD11A1 Version 6

All above datasets can be accessible using Google earth engine.

https://developers.google.com/earth-engine/datasets/catalog/MODIS_006_MOD16A2

https://developers.google.com/earth-engine/datasets/catalog/UCSB-CHG_CHIRPS_DAILY

https://developers.google.com/earth-engine/datasets/catalog/MODIS_006_MYD11A1

Hi Sonali,

I am not an expert of the analysis you are working or intended to work.

But with your interest i have looked for some answers and found some basics for you if you're looking for land surface temperature (LST) which could be a key variable in surface-atmosphere energy and water exchanges.

Cold Bias of ERA5 Summertime Daily Maximum Land Surface Temperature over Iberian Peninsula

by, Johannsen, F. et al.

Precipitation and snow cover in the Himalaya: from reanalysis to regional climate simulations

by, M. Ménégoz et al.

From ERA-Interim to ERA5: the considerable impact of ECMWF's next-generation reanalysis on Lagrangian transport simulations.

by, Lars Hoffmann et al.

Hope this may be some where useful for you.

Thanks,

Dhavamani.

Try to use CLIGEN model is more famous and has more accurat.