how to calculate the sea ice area with three-dimensional data

To whom it may concern
I am trying to calculate total NH sea ice area with AMIP data are
three-dimensional(time, lat, lon),
but I don't know how can I match the array with "wgt_areasum2" function.

I found some examples on the internet(but only used 4-dimensional data
examples)
but failed to calculate sea ice area
because I don't have weight variables or weight files

Thank you for your help in advance.

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Received on Mon May 6 06:22:07 2013