Single value from 2D array

I am attempting to take a 2D array and extract each of the values and sum them
up (if they meet a certain threshold) to give me one,single integer. It
ultimately does not matter if I keep the location (as the 2D array values are
associated with gridpoints, not latitude/longitude) since all I want to do is
sum up the values to give me one number.
 
This seems like a relatively easy thing to do yet I have been struggling. Is
NCL capable of this procedure and if so, how? Thank you, in advance, for any
suggestions.

Brooke

-- 
Brooke A. Halvorson
Severe Weather Research Group
Department of Earth and Atmospheric Sciences
550 Stadium Mall Drive
Purdue University
West Lafayette, IN 47907-2051
www.purdue.edu/eas/severe
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