A simple scheme for objective analysis in curved flow.

Abstract

An objective analysis scheme was developed which combines the use of three different weighting functions, two of which are anisotropic (elliptical and banana shaped). The 'effective' distance between a grid point and an observation point used for the anisotropic functions may be applied in any objective analysis scheme which uses distance to calculate weights or correlations, but a successive correction scheme was used as a vehicle for testing. This relatively simple and computationally inexpensive scheme produces wind and moisture analyses in which along-flow autocorrelation is accentuated, especially in regions of curved flow and simulates conventional subjective analysis procedures. Sample analyses from a case study are presented which demonstrate the improvement which may result from using this scheme rather than one with the circular weighting function alone. (from authors' abstract)