Some characteristics of the PBL over the ocean during the Indian summer monsoon

Abstract

Data collected during the Indo-Soviet Monsoon-77 expedition are used to determine quadratic expressions for the universal constants A and B, as functions of the stability parameter, p. A quadratic expression has also been obtained for u*, in terms of the surface wind u,. It is shown, from the mean values of q and en, that the entire area covered by the expedition could be divided into four regions around the point 13"N, 78" E. The mean thermal characteristic of each region differs. It is shown that the northeastern quadrant is most favourable for the sustenance of a tropical storm once it has formed.

Wind Structure of the Boundary Layer Over the Tropical Ocean

“…Vertical shear of wind speed below the height of the maximum is usually less than 3*10sec-1, suggesting an excellent mixing of momentum throughout the mixed layer (Augstein et al, 1974). Larger wind shear is found by some investigators (Sheppard and Omar, 1952;Aspliden et al, 1978;Sinha and Khade, 1980), but in their studies, the existence of the mixed layer is not referred to. In contrast, tropical boundary layer wind measurements in situations such as those near the intertropical convergence zone, i.e.…”