The Shallow Layer of High Salinity in the Southwestern Tropical Atlantic Ocean
Abstract:The source of the shallow layer of high salinity in the southwestern tropical Atlantic Ocean is found at about 19°-21° S latitude, though the eastward extent of the source area remains unresolved. Continuity is established between this sea-surface source area and northward extension of the layer near the continental margin as far north as the equator in August-October 1966 (R/V Undaunted Cruise 5), and as far as 4° N in April-May 1969 (R/V Glacier Cruise 4-69). A description is given of the structure and extent of the layer, based on salinity profiles continuously recorded by in situ salinity-temperature-depth (STD) systems. The minimum travel time (∼ 200 days) for water in the layer is computed for its flow from the area of formation to the island of São Tomé in the eastern Gulf of Guinea by way of the Equatorial Undercurrent. The volume transports of high-salinity water (> 36.3‰) were not constant from the source area to the Gulf of Guinea.
Document Type: Research Article
Publication date: September 1, 1971
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