Assimilation of Scalar Versus Horizontal Gradient Information from the VAS into a Mesoscale Model
- 1 June 1987
- journal article
- Published by American Meteorological Society in Journal of Climate and Applied Meteorology
- Vol. 26 (6) , 738-748
- https://doi.org/10.1175/1520-0450(1987)026<0738:aosvhg>2.0.co;2
Abstract
Comparisons are made between analyses and forecasts which incorporate VAS geopotential data as either scalar or horizontal gradient information for a mw study on the AVE/VAS day of 6 March 1982. On this day, incorporating the VAS information in analysis as a variational constraint on horizontal geopotential gradients significantly mitigated the effects of large data biases which made VAS assimilation by standard scalar methods very difficult. A subsequent forecast made from the gradient assimilation was superior to one made from the standard analysis and of comparable quality in geopotentials to a control forecast from synoptic data. Most impact was noted in the forecasts of vertical motion and precipitation in the gradient versus this control simulation.Keywords
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