The meridional transport of momentum in the wave number regime during the contrasting monsoon years

Abstract

The momentum transport by the standing eddies are computed during a weak monsoon year (1972) and a strong monsoon year (1967) in the wave number regime for the months of April to August in the northern hemisphere at 700 mb and 300 mb levels.

The integrated effect of the first 16-wave numbers considered, indicate a more northward transfer of momentum at 300mb level in a year of a good monsoon than a weak monsoon. The wave numbers 1 and 3 at this level contribute maximum northward transfer in the lower and middle latitudes during the period April to August, whereas the wave number 2 contributes southward transfer in both the years during this period (i.e., April to August).

The comparison of monthly transport at 700 mb level for both the years does not indicate significant difference from each other. Howevey at 300mb level, we find contrast in both the years in wave number regime. The wave numbers 1 to4 are prominent. The wave numbers 1 and 3 are very prominent in the months April and June. The transport by the wave number 3 is very much northward in 1967 than in 1972 during April and June at all the latitudes. The transport is much above normal at 300 mb level in 1967 than in 1972 during April and June.