Worthington (1972a) advanced the hypothesis that winter cooling of the Gulf Stream south of New England is the cause of the Stream's winter intensification. That loss of buoyancy should result in increased velocity and transport in an oceanic jet stream seems at first paradoxical....
Csanady, G. T.. 1982. "The thermohaline driving mechanism of oceanic jet streams." Journal of Marine Research 40, (S). https://elischolar.library.yale.edu/journal_of_marine_research/1636