PIV ANALYSIS OF ATMOSPHERIC PRESSURE DISTURBANCE OVER THE EAST CHINA SEA IN RELATION TO OCCURRENCE OF SECONDARY UNDULATION

Abstract

 Characteristics of propagation of atmospheric pressure disturbance over the East China Sea were investigated using the output data from numerical weather prediction model, called meso-scale model (MSM), developed by the Japan Meteorological Agency. By applying the method of particle image velocimetry (PIV) to the consecutive images of sea-level atmospheric pressure based on the MSM outputs, we could find the atmospheric pressure disturbance travelling eastward at speeds of 115-150km/h and causing the occurrence of large secondary undulation at the west coast of Kyushu. It was suggested from the results that the MSM sea-level pressure data are useful for predicting the occurrence of the secondary undulation at the west coast of Kyushu.