Recently, Stommel and Schott (1977) have proposed a method for computing absolute geostrophic current spirals from observations of the density field alone . Some applications of the method have led to ambiguous results in which the computed spirals have depended on the depth range of the data used....
Behringer, David W.. 1979. "On computing the absolute geostrophic velocity spiral." Journal of Marine Research 37, (3). https://elischolar.library.yale.edu/journal_of_marine_research/1478