东亚夏季风建立过程中的大气能量变化

本文利用1980、1981年4—6月资料,分析了0°—25°N、95°—120°E区域中的大气能量变化。发现在东亚夏季风建立过程中,该区域中能量水平收支和分布均发生了明显的变化,并能较好地反映出东亚夏季风的建立早晚和强弱差异。对总能量各项的计算结果表明:潜热能是东亚夏季风建立过程中的一个重要影响因子。 文章还初步研究了东亚夏季风建立前期,中低纬环流之间相互作用的动力学表现。指出90°—125°E之间,前期越过35°N向南输送的涡动动量对东亚夏季风建立具有触发作用。 

AN ENERGY ANALYSIS ON THE ONSET PROCESSES OF THE SUMMER MONSOON OVER EAST ASIA

The thesis, having analysed the variations in atmospheric energy over a domain bounded by 95°and 120°E, and 0°and 25°N during the periods of April to June of both 1980 and 1981, reveals the fact that the horizontal energy divergences and the horizontal energy distributions over that domain changed notably during the onset processes of the summer monsoon over East Asia, and reflected relatively the early and late beginnings of the onset and the differences of strength. The calculations show that latent energy is a significant factor of the onset processes of the summer monsoon over East Asia.The thesis also makes a preliminary study on the dynamic expressions of the interaction between the middle and lower latitude circulations before the onset, and points out that the southward transportation of eddy momentum across 35°N triggers the onset of the summer monsoon over East Asia.