Some experiments in the objective analysis of the wind-field over India and neighbourhood

Abstract

As a first step towards preparing input of wind observations for numerical weather prediction, work in the Indian region, objective analysis of the wind-field has been made on a number of maps using a variation, of Cressman's Scheme. The programme was executed on the CDC 3600 computer adopting a (53 X 17) grid in the region between 200 to 15O^oE and the equator to 40°N, The.  Stream line patterns obtained by objective analysis for three maps are compared against conventional analyses.  Vorticity patterns using the wind obtained from the objective analysis are presented, Root mean square error of the analysed winds, with reference to the station observations is found to be about 8 kt. The stream function patterns, as well, as 500 mb 24, hours, forecast based on non-divergent barotropic mode.1 with the objective and the subjective wind analysis as Inputs, do not show any synoptically significant differences.