
%0 Journal Article
%A Rochford, DJ 
%T Further studies of plankton ecosystems in the eastern Indian Ocean. II. Seasonal variations in water mass distribution (upper 150 m) along 110&#176;E. (August 1962-August 1963)
%J Marine and Freshwater Research
%D 1977/10/01
%V 28
%N 5
%P 541-555
%K 
%R https://doi.org/10.1071/MF9770541
%U https://www.publish.csiro.au/paper/MF9770541 
%X From temperature-salinity relations, with approximate corrections for localized heat exchange, and from evaporation-precipitation records, in an upper mixed layer of 50 m (tropical) and of 75 m (subtropical region), the variations throughout the year of the principal surface and subsurface water masses along 110&#176;E. have been examined. In winter-spring the west-flowing South Equatorial Current and the east-drifting subtropical waters maintain a tropical convergence around 20&#176;S. Doming of deeper tropical waters creates a nutrient-enriched near-surface zone to the north of this South Equatorial Current. In summer-autumn the east-flowing Monsoon Current creates a more sluggish uplift of deeper waters around 20&#176;. These deeper waters, however, contain little of the deeper nutrient-rich tropical waters. Around 30-35&#176;S. nutrient-richer deeper water is carried into near-surface layers by doming within cyclonic eddies or by horizontal entrainment from the south. A number of other surface water bodies of tropical origin occur irregularly throughout the year at the northern end of the 110&#176;E. section. 
