Intensive observations of the low frequency (less than one cycle per day) response of upwelling regimes to fluctuations in the wind have been made in two locations: the Oregon coast near 45°15'N, and the Northwest African coast at 21°40'N. Both regimes show an equatorward coastal jet at the surface, quasi-barotropic fluctuations in the alongshore flow, and a poleward undercurrent....
Huyer, Adriana. 1976. "A comparison of upwelling events in two locations: Oregon and Northwest Africa." Journal of Marine Research 34, (4). https://elischolar.library.yale.edu/journal_of_marine_research/1374