A History of Land Use in Arid Regions by L. Dudley (Editor) Stamp

By L. Dudley (Editor) Stamp

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Reduced evaporation associated less and high lake fitrandlines here must also be with lower summer temperatures (5" C. and more) assigned in good part to greater precipitation. ,so that it overflowed into the interiors. A tentative picture of the W ü r m age Black Sea. For details see [87,p. 320-391,[26, p. 27-32, vegetation of Eurasia is given by Frenzel and Troll [50], p. 87-97] and [45, p. 234-361. Of further interest of the Near East by Butzer [26], the main features in the semi-arid region is the temperate or even of which have been reproduced in Fig.

Cool-dry. Westerly and south-westerly (south and north meridional) steering,Late interglacial (interpluvial). 4. Warm-dry. South-westerly (south meridional) and westerly steering. Interglacial (interpluvial). Alast factor, not yet fully analysed, is the question of the absolute intensity of the circulation in the sense of the upper air wind velocities and the rate of the condensation cycle. One could suggest the warmdry and cool-dryperiods as characterized by a general slackening of,the condensation cycle and a lower vapour content o€ the atmosphere, and vice verba.

The upper westerlies lie at very high altitudes in the domain of the equaLOW PRESSUR torial easterlies, generally at above 18 km. A t the contact zone of the surface westerly and easterly winds, subsiding air from higher levels is HIGH PRESSUR associated with the subtropical belt of high pressure-a zone of anticyclonic cells known as the horse latitudes. Simultaneously the intense heating of the atmosphere at the equator leads to mass convection INTERTROPICAL CONVERGENCE ZONE and a belt of low pressure tending to follow the zone of m a x i m u m seasonal insolation.

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