Hi, You need to make use of the @MAX and @LOC transformations as mentioned here in the user guide. http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/variables-xpressions/XPRESSIONS#_VPID_174 You subtract the maximum velocity at each time from U and the find the depth at which this new variable is zero. In your case let u_max = u_new[z=@max] let zero_at_max = u_new-u_max let depth_at_max = zero_at_max[Z=@LOC:0] (Ansley, this one seems to come up a few times. It's probably worth adding the example to the FAQ Analysis section.) Cheers, Russ On 30/04/14 14:58, chinnu sachi wrote:
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