areal average for ocean or land or coast only from multiyear datasets

Hallo NCL users,

I have 5 years datasets [time x lat x lon] 1 deg resolutions and recently
attempting to calculate areal average for
land or ocean only using masking function. I look into some documentations
such as http://www.ncl.ucar.edu/Applications/Scripts/mask_1.ncl
and I just wonder how can i get the mask file for my purpose or is there
any other simple way to mask the land or ocean, and afterwards calculate
the areal avergae
for multiyear data ?

Thanks for the hints and response.

Raf.

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Received on Thu Dec 27 12:46:20 2012