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Physical characteristics of waters and water masses off the west coast of India during late spring

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Title Physical characteristics of waters and water masses off the west coast of India during late spring
 
Creator Varadachari, V. V.R.
 
Description 1-4
The paper presents an approximately synoptic distribution of temperature, salinity and Sigma and the associated hydrographic features of the shelf and slope waters off the west coast of India for late spring, based on data collected between Bombay and Alleppey during 22 March to 1 April 1965. Significant space variations have been noticed in all the parameters. The salient features are: (1) Surface temperature shows a gradual increase from north to south (temperature variation about 3.5°C) while salinity and sigma-t show a decrease (salinity variation about 1.4% and variation in sigma-t about 2.0). (2) A tongue of high salhdty water (with
salinity greater than 36.0%) extends from the offshore region towards the shelf. The depth of the core varies mostly between 70 and 80 m over the shelf region. (3) The thermocline tilts upward towards the coast and is found up to the mid-shelf in most of the areas. There is a general increase of temperature of the top of the thermocline and a decrease in its depth from north to south. (4) Vertical sections of temperature, salinity and sigma-t indicate the tilting up towards the coast, of isolines of these parameters in the shelf and slope regions, revealing the existence of upwelling. This feature is more pronounced off Karwar and Mangalore but the upwelled waters do not seem to reach the surface in any of the areas. (5) The density of waters decreases from north to south in the surface but the reverse is the case at 100 m depth. This indicates commencement of upwelling in the south earlier than in the north. (6) The presence of Persian Gulf waters (between 200 and 385 m depth) and the spread of Red Sea waters (between 436 and 643 m depth) is noticed in the more offshore regions.
 
Date 2017-01-03T04:33:43Z
2017-01-03T04:33:43Z
1974-06
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://nopr.niscair.res.in/handle/123456789/39513
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.03(1) [June 1974]