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Evidence is presented to show that the highly variable interannual rainfall over Northeast Brazil is dependent on the degree of cyclonic activity or blocking in the Newfoundland-Greenland area during the Northern Hemisphere winter and spring. The linkage is traced through variations in the subtropical Atlantic anticyclone, the northeast trades and the responding Hadley cell which is forced to vary in position and strength. Intense blocking over North America and the North Atlantic is usually associated with devastating drought over Northeast Brazil.
Jerome Namias (Sat,) studied this question.
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