以相當正壓模式研究地形的動力效果

蔡清彥 胡仲英

臺灣大學大氣科學系

ABSTRACT

　　The dynamic effect of the topography has been studied by comparing the predicted results of equivalent barotropic models with and without mountains. It is concluded that a trough will intensify when it passes through the eastern slope of Tibetan Plateau. In winter, the 500 mb contours near a trough could decrease 90 meters in a day by the effect of terrain. With troughs moving northward and weekening in summer, the terrain effect is also weakening. Topography affects the strength of a trough but not its movement. A trough in developing stage moves faster in a equivalent barotropic model, with or without mountains (~29 m sec^-1), than in the real atmosphere (~23 m sec^-1). However, the equivalent barotropic models could predict the movement of a developed trough quite well.