Download a wind stress dataset from ECCO, COADS, etc. There are some wind files that I have pre-processed here. These already have wind stress curl calculated, too.

They are derived from the:

1. Grist & Josey climatology,
   
2. The ECCO data-assimilating model iteration 199,
   
3. The Hellerman & Rosenstein Climatology,
4. The SCOW Climatology, and
   
5. The NSCAT scatterometer data.
   

I have given you the wind stresses and wind stress curls. Calculate the Ekman transports and the Ekman Divergence. What features are revealed? How do datasets differ by month/year/across datasets?

You may want to check out this paper! and this paper!