A ONE-DIMENSIONAL NUMERICAL SIMULATION OF WINTER SEASONAL WINDS BY USING THE κ-ε MODEL

Abstract

A distribution of atmospheric pressure in which the high pressure area lies to the west and the low pressure area to the east is a typical one covering Japan Sea area in winter. The characteristics of the atmosphere above Fukuoka city undersuch a pressure system have been investigated on the basis of the data obtained from upper-air observations and analyzed by using the one-dimensional k-ε model. Contour line profiles of potential temperature and wind speed drawn in a latitude-height section show that the Siberian cold air mass absorbs a large amount of heat and vapor in flowing down on Japan Sea and a mixed layer develops over 1-2 km height. The analyzed results for the potential temperature and the eastwestcomponent of the horizontal wind velocity agree well with ones obtained from upper-air observations.