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PALEOTEMPERATURE ANALYSIS OF THREE SEDIMENT CORES FROM THE NORTH ATLANTIC In Russian)
... contents of dextrally and sinistrally spiral varieties. planktonic foraminiferal tests in characteristic samples, as well as the paleotempexature estimates for sedi ment core No. K-434, as obtained both micropaleontologically and by the oxygen-isotope method, and their analyses have been published earlier[ 8 ].The cooling effect on the mean annual water tempera ture in the area of each station exerted by the cold cur rents moving toward the equator (the Canary and Benguela currents) and the upwellings associated with them(At) can be approximately defined and estimated as the difference between the temperature at the given station (t) andthe temperature in the central part of the ocean at the same latitude (T): M = T -t . For the Recent epoch, A<,"=7',-10-forthetim eof 18,000yrsago, Д T i *-Л s. ...
The distribution of planktonic foraminiferal tests was studied in four drill cores of Upper Quaternary sediments from the zone of influence of the Canary upwelling and in nine sediment cores from the zone of the Benguela upwelling. The paleotemperatures were reconstructed from these data. It was established that under the conditions during the stadials, interstadials, and interglacials of Quaternary time, the upwelling existed continuously, intensifying and expanding during the colder epochs and weakening and contracting in the warmer intervals. During the last stadial (about 18000 yrs ago), the relative cooling of the sea waters as compared to the central regions of the ocean in the zone of the Canary upwelling was no less than 9°С (4.5° С more than at the present time), and in the zone of the Benguela upwelling it was no less than 15°C (8.5°С more than at the present time).
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