Page Comparison

This step is in preparation for vertical interpolation using the new NCO functionality. NCO vertical interpolation uses a vertfile to define destination vertical grid layout.  For EAM's hybrid vertical coordinate, it takes PS as well as hybrid coordinate coefficients – If PS is not provided in the vertfile,  it would assume the same PS as in the source data. In this workflow, the vertfile included the adjusted PS that account for the mismatch in topography between source data and model. The topography in source data has been remapped to destination grid after step 4. Without adjusting for the mismatch, the resulting interpolated initial file could excite fast gravity wave via dynamical adjustment during first few steps of simulation, hence requiring much shorter time stepping than intended for the target resolution – a process commonly called spin-up.

This step is handled by /project/projectdirs/m2136/analysis-IC/vertfile_topoadj_ne512.sh

It requires a generic EAM vertical coordinate file, the topo file for target grid, and PS, PHIS and bottom level temperature extracted from horizontally remapped file after step 4. See the comments in the script for more info.