Development of Regionally Extended/Worldwide Version of System for Prediction of Environmental Emergency Dose Information: WSPEEDI, (I)

As a part of the study to expand the computational region of SPEEDI (System for Prediction of Environmental Emergency Dose Information), a mass-consistent wind field model developed for the local or mesoscale wind field was improved for the calculation of synoptic wind field. The major modification is the consideration of earth's curvature. The values of computational parameter were reexamined. This model was applied to the calculation of three-dimensional wind fields over Europe in the case of Chernobyl accident. The calculated horizontal wind fields agreed well with patterns of surface pressure and 850 mb geopotential height. The cyclonic winds around low pressure regions and the anticyclonic winds around high pressure regions were successfully computed by the model. The distribution pattern of calculated vertical wind roughly correlated with the surface weather chart.