http://nopr.niscpr.res.in/handle/123456789/38392 Thu, 08 Oct 2026 11:52:49 GMT 2026-10-08T11:52:49Z http://nopr.niscpr.res.in/handle/123456789/38771 Title: Determination of Vertical Velocities in the Equatorial Part of the Western Indian Ocean Authors: Bahulayan, N; Varadachari, V V R Abstract: Using steady state two-dimensional turbulent diffusion equations of salt and heat some important characteristics of vertical circulation in the equatorial part of the Indian Ocean have been evaluated and discussed. Upwelling and sinking velocities, on an average, vary from 10/2 to 10/3 cm.sec/1 in the domain, and along the coast of Somalia; vertical velocities of the order of 10/1 to 10/2 cm.sec/1 have been obtained. The study has enabled the identification of zones of convergence and divergence in the equatorial part of the Indian Ocean. Accuracy of the present method depends on the data on temperature and salinity and also on the values of eddy coefficients. Page(s): 55-58 Sat, 01 Jun 1985 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/38771 1985-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/38765 Title: Surface Drift Current over Arabian Sea during May 1983 Authors: Prasad, M V Ravi; Rao, G R Lakshmana Abstract: An attempt has been made to obtain mean monthly total surface drift currents from mean monthly wind and swell data reported routinely by navy and merchant ships. Total surface drift currents comprise 2 components, viz. mass transport due to surface waves and wind induced surface drift currents which are estimated separately and added vectorially. Page(s): 59-61 Sat, 01 Jun 1985 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/38765 1985-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/38763 Title: Surface Circulation over the Shelf Off the East Coast of India during the Southwest Monsoon Authors: Krishna, V V Gopala; Sastry, J S Abstract: V V Gopala Krishna & J S Sastry From the hydrographic data collected on board R V Gaveshani in the Western Bay of Bengal during August-September 1978, fields of temperature, salinity have been constructed and the probable flow regime has been deduced. The studies indicate strong upwelling in the southern regions off the East Coast of India. Vertical temperature and salinity structures north of Visakhapatnam show a predominant estuarine character and upwelling is not evident. In the northern regions, the flow is directed south and is consonant with that derived from wind stress curl distribution. Page(s): 62-65 Sat, 01 Jun 1985 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/38763 1985-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/38762 Title: Fluctuation in Glacial and Interglacial Sediment Discharge of the River Indus as Seen in a Core from the Arabian Sea Authors: Guptha, M V S; Hashimi, N H Abstract: Sediment core from the upper continental slope off Saurashtra Coast has been analysed for CaCO sub(3) and coarse fraction contents in addition to planktonic foraminifera and clay mineralogy. Based on CaCO sub(3) and planktonic foraminiferal data a boundary between glacial and interglacial is placed at 42 cm assuming the sedimentation rate as 4 cm 1000 y/1. Distribution of CaCO sub(3) clearly shows the sharp change in its abundance at the 42 cm boundary. Among planktonic foraminifera, Globigerinoides sacculifer and G. ruber are by far the most abundant. Variation in the planktonic foraminiferal fauna is not as sharp as CaCO sub(3), because of the insignificant change in the temperature during glacial and interglacial periods of late Pleistocene. Some species of Orbulina, viz. Orbulina bilobata and O. suturalis are encountered and believed to be reworked ones. Distribution of clay minerals such as kaolinite, illite and chlorite along with quartz shows and increasing trend towards the bottom of the core in the glacial period. This may reflect the fluctuation in the sediment discharge from the river Indus, whereas, in the interglacial period this is not encountered and may be attributed to the existence of dynamic barrier in Holocene. Page(s): 66-70 Sat, 01 Jun 1985 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/38762 1985-06-01T00:00:00Z