The Biology of the Indian Ocean by G. Dietrich (auth.), Dr. Bernt Zeitzschel, Prof. Dr.

By G. Dietrich (auth.), Dr. Bernt Zeitzschel, Prof. Dr. Sebastian A. Gerlach (eds.)

This quantity comprises the court cases of a Symposium held on the collage of Kiel, Germany, from 31 March to six April, 1971. The Symposium used to be equipped by way of the medical Committee on Oceanic examine (SCOR) and the Marine productiveness component of the foreign organic Programme (IBPIPM) with the help of the United international locations academic, clinical and Cultural association (UNESCO), the nutrition and Agriculture association (FAO), and the foreign organization of organic Oceanography (IABO). the purpose of the Symposium used to be to summarize current wisdom of the biology of the Indian Ocean. Twenty-two shows by way of invited audio system reviewed the examine paintings performed through the overseas Indian Ocean day trip (lIOE) 1959 -1965, the 1st cooperative undertaking coordinated by means of the Intergovernmental Oceanographic fee (IOC). additionally, studies have been awarded of postexpedition exam of fabric and of more moderen investigations suitable to the goals of the lIOE. in line with the goals of "Ecological Studies", the current quantity includes a lot new details and a few synthesis, all directed in the direction of acquiring an realizing of the functioning and association of the surroundings of the Indian Ocean. The plan of the Symposium used to be to give the suitable meteorological, actual, chemical and geological history and to stick with this with a few of the elements of organic oceanography. as a result of the asymmetric degree of improvement of different disciplines, the papers integrated during this quantity differ of their analytical level.

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84 ~ ~ Fig. 6. Horizontal mass transports on the SE Arabian coast between the ocean surface and 100 m. The circled numbers are vertical mass transports at 100 m. Units are 106 tons sec- t from "Discovery" data, 1963. (From BorrERo, 1969) ... : . I CAPE . .... '. , .. ' '. 7 1 ~ ~ Fig. 7. Horizontal mass transports between 300 m and 700 m. The circled numbers are vertical mass transports at 700 m, Units are 10 6 tons sec-to (From BorrERo, 1969) 44 R. I. CURRIE, A. E. FISHER and P. M. HARGREAVES: constancy of the monsoon wind.

This is because during the NE monsoon the South Equatorial Current does not belong to the monsoon gyre, while during the SW monsoon, its northern parts form part of the monsoon gyre. At the surface the boundary zone between the 2 gyres is marked by a horizontal salinity minimum stretching from Sumatra to Africa. This band of low salinity is rather wide in a north-south direction and its center is difficult to define. However, in maps of salinity at all horizons between 100 and 500 m depth, there is a distinct horizontal salinity minimum stretching along 10° S all the way from Timor to the north of Madagascar.

Under favorable wind conditions, considerable sinking must occur Physical Oceanography of the Indian Ocean 31 at these locations. In any case, over most of the central Indian Ocean and the Great Australian Bight, the subtropical convergence is a zonal strip of water along the boundary between warm subtropical water of high salinity and cooler, temperate water of lower salinity, along which under favorable wind conditions sinking may occur. The mean position of this strip is 40 0 to 41 0 S, and before reaching Tasmania the feature has practically vanished.

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