MERRA-2 const_2d_lnd_Nx: 2d, constants Land Surface Diagnostics 0.625 x 0.5 degree V5.12.4 (M2C0NXLND) at GES DISC
M2C0NXLND (or const_2d_lnd_Nx) is a data collection in Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2).  This collection consists of 2-dimensional constant land surface parameters,  such as thickness of the predefined soil layers, soil porosity, and soil wilting point. 

MERRA-2 is …