The spacing of bands of Sargassum in the Atlantic Ocean is shown to be dependent upon the wind speed. These bands are indicative of the presence of helical vortices in the surface waters, and the data support Langmuir's contention that the vortices are wind-driven.
Faller, Alan J., and Alfred H. Woodcock. 1964. "The spacing of windrows of Sargassum in the ocean." Journal of Marine Research 22, (1). https://elischolar.library.yale.edu/journal_of_marine_research/1016