how to calculate transport across the boundary and area integration for an area

Hi,
I was calculating moisture transport using NCEP Reanalysis2 data. I
need to calculate transport across each of the boundaries of a box
containing my area of interest.

I also need to calculate area integration for the same box.
How is it possible to do using NCL?

Thanks,
Bithi

-- 
Bithi De
Graduate Student , Research Assistant
International Arctic Research Center , University of Alaska Fairbanks
Fairbanks , Alaska -99775
USA
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