Abstract
Some of the observed features of the Arabian sea summer monsoon, such as the formation of a low-level highspeed aircurrent, strengthening of the intertropical convergence zone over northeastern Arabian sea and formation of a secondary convergence zone over southeastern Arabian sea, changing patterns of cloud distributions and formation of double cloud bands over eastern Arabian sea and rainfall discontinuities along the west coast of India between July and August are discussed in relation to possible complex transformations of airmasses that cross the Arabian sea with a continually changing pattern of surface temperature during period May through August. It is hypothesised that following coastal upwelling in Somalia and Arabia during late May or early June, a wedge of cold water is advected across central Arabian sea by the southwestmonsoon current and that it is the feed-back effect of this advection upon the atmosphere that may be largely responsible for the observed monsoon features. DOI: 10.1111/j.2153-3490.1974.tb01624.x

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