This slide shows
some of the steps we use to get our estimates of Ri. For a given CTD station,
we average U and V during that time period to get an average U and V as
functions of depth. From this we can
find the shear (top right). Here, you can see that there is a large amount of
shear between 160  200 m. 

We then use the
CTD data to calculate the buoyancy frequency (lower middle panel). We use the
ration of N^2 to Shear^2 to estimate Ri (see previous slide). Here you see that Ri is less than 1 in the
area of large shear around 200 m. 
