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$partialdiff sub P$ $partialdiff sub P$ [ NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic PressureLevel CBTZW ] climatology

Longitude grid: /X (degree_east) periodic (0) to (2.5W) by 2.5 N= 144 pts :grid
Latitude grid: /Y (degree_north) ordered (90N) to (90S) by 2.5 N= 73 pts :grid
P grid: /P (mb) ordered [ (925.0) (831.25) (712.5) (600.0) (500.0) (400.0) (312.5) (250.0) (200.0) (150.0) (105.0) (72.5) (50.0) (32.5) (20.0)] :grid
Time grid: /T (months since 01-Jan) periodic (Jan) to (Dec) by 1.0 N= 12 pts :grid

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