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Upwelling and upward mixing in the Arabian Sea

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Title Upwelling and upward mixing in the Arabian Sea
 
Creator Sastry, J. S.
D'souza, R. S.
 
Description 17-27
Oceanographic evidence suggests that the nutrient enrichment of the surface layer in the Arabian Sea takes place in two phases. In the first phase, vertical mixing and thermohaline upwelling transfer the deeper subsurface nutrients to relatively shallow depths (200-300m). In the second phase, wind-induced upwelling plays an important role to bring these nutrients to the surface layer. In this paper, an analysis of the oceanographic parameters in the Arabian Sea during the south-west monsoon season is presented. Upwelling off the coasts of Somali and Arabia is studied in some detail. The near surface circulation shows the development of several clockwise and anti-clockwise gyres in the central Arabian Sea, which necessitate considerable vertical movements. These studies further suggest that moderate upwelling off the south-west coast of India results partly due to the divergence in the field of motion off this coast and partly due to cyclonic motion in the neighbourhood of laccadive and Maldive islands. At intermediate depths, the distribution of inorganic phosphate (PO4-P) along a meridional section shows a sudden rise of these isopleths at about 7° N, thereby showing relatively high concentrations of nutrients at shallow depths in the central and north-eastern regions. The sudden shift of these isonutrients seems to be closely related to the mixing processes. Also included in this paper is a speculative study of thermohaline upwelling.
 
Date 2017-01-03T09:13:23Z
2017-01-03T09:13:23Z
1972-06
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://nopr.niscair.res.in/handle/123456789/39580
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.01(1) [June 1972]