On Snow Line Depression and Atmospheric Circulation in the Tropical Americas during the Pleistocene*

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Abstract
Field observations during travels through the high mountain regions of the Tropical America evaluated in conjunction with available air photographs and reports In the pertment literature. Results indicate a decrease of the pleistocene snow line depression in the western Cordillera from more than 1500 m at 300 S to about 700 m at 12°S, an increase to 70 S and a depression consistently larger than 1 000 m fromthere throughout the equatorial belt, to l0°N; values of less than 900 mand about 700 m are indicated for 19°N and 37°N, respectively. The pleistocene snow line depression decreases from the Pacific to the Atlantic side of the Andes, but particularly strongly so on the poleward fringe of the Atacama Desert. A reversal of the zonal snowline pattern is borne out for about 29°S.

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