Ecological Archives E096-124-A1
Maya C. Pfaff, George M. Branch, Jennifer L. Fisher, Vera Hoffmann, Allan G. Ellis, and John L. Largier . 2015. Delivery of marine larvae to shore requires multiple sequential transport mechanisms. Ecology 96:1399–1410. http://dx.doi.org/10.1890/14-0229.1
Appendix A. Formula for the calculation of stratification (Brunt-Väisälä frequency).
Water column stratification was computed as the square of the Brunt-Väisälä frequency
where g is gravity (9.8 m s-2),
is mean water column density, and 
is the change in density with depth. Density was calculated according to the UNESCO polynomial (Fofonoff and Millard 1983), based on 18-h low-pass filtered temperatures, a salinity of 35 psu, and pressure calculated from latitude and depth.
Literature cited
Fofonoff, P., and R. Millard. 1983. Algorithms for computation of fundamental properties of seawater, 1983. Unesco Tech. Pap. in Mar. Sci 44:1–53.