I have a question regarding the conversion of the soil moisture content from kg m-2 (or mm) to volumetric soil moisture. Therefore, I'll need to know the soil porosity in different grids and I was wondering if such data is available at all in the GLDAS as I couldn't find it.
I have downloaded the soil moisture content data (SoilMoi0_10cm_inst, SoilMoi10_40cm_inst, SoilMoi40_100cm_inst, and SoilMoi100_200cm_inst variables from GLDAS Noah Land Surface Model L4 monthly 0.25 x 0.25 degree V2.0) and one of the downloaded netCDF files is attached for your consideration. Do you have any idea on how to convert these variables in volumetric soil moisture values? Can I get the soil porosity from GLDAS dataset as well or I need to look for it from a different source such as Harmonized World Soil Database (version 1.0) (FAO/IIASA/ISRIC/ISSCAS/JRC 2008) which is used in the ESA CCI soil moisture dataset?