A striking feature shown on charts of horizontal circulation of the ocean in the southern California region, Lat. 32° to 34.5° N., is a large counterclockwise eddy between a northward inshore current and a southward offshore current. Charts arranged in time order from spring, at intervals of about two weeks, show a decrease in velocity and an increase in size of the eddy....
McEwen, George F.. 1948. "The dynamics of large horizontal eddies (axes vertical) in the ocean off southern California." Journal of Marine Research 7, (3). https://elischolar.library.yale.edu/journal_of_marine_research/661