namelist.p_midlevel grabs from closest pressure level in calculating mid-level thermodynamics, in case the model levels do not have have 600-hPa. However, note, that this does not interpolate the value of chi to the 600-hPa level. The model parameterization of chi was trained at 600-hPa in ERA5, and climatological values of chi are at a minimum near 600-hPa.
Also include averaging over daily time scales before calculating the wind variance; is best to provide at least twice daily (12-hourly) winds. This is a major component to reduce looping tracks.
namelist.p_midlevel grabs from closest pressure level in calculating mid-level thermodynamics, in case the model levels do not have have 600-hPa. However, note, that this does not interpolate the value of chi to the 600-hPa level. The model parameterization of chi was trained at 600-hPa in ERA5, and climatological values of chi are at a minimum near 600-hPa.
Also include averaging over daily time scales before calculating the wind variance; is best to provide at least twice daily (12-hourly) winds. This is a major component to reduce looping tracks.