NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic[surface MSL PressureLevel total_air_column ]
NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic PressureLevel[rhum CBTW CBVQ CBUQ reld qa CBQW vtemp CBMZW CBTZW CBTMW vpot CBUW u vvel phi CBVW temp v psi relv ]
grid: /X (degree_east) periodic (0) to (2.5W) by 2.5 N= 144 pts :grid
grid: /Y (degree_north) ordered (90N) to (90S) by 2.5 N= 73 pts :grid
grid: /P (mb) ordered [ (1000) (925) (850) (700) (600) (500) (400) (300) (250) (200) (150) (100) (70) (50) (30) (20) (10)] :grid
grid: /T (months since 1960-01-01) ordered (Jan 1949) to (Feb 2023) by 1.0 N= 890 pts :grid
$partialdiff sub P$ $integral dX$ [ NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic PressureLevel psi ] [ X Y | P T]

CPTv10+ files for $partialdiff sub P$ $integral dX$ [ NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic PressureLevel psi ]