中文摘要：

利用2008年10月15日—11月16日在广州从化获得的基线小球测风资料,分析研究了秋季从化山谷风的特征。研究表明：从化山谷风主要出现在系统风速小于1.5 m/s,谷风出现时间为10：00—18：00,山风强度比谷风强度大;山谷风厚度大致为300 m,回流出现高度在300～700 m;山谷风转换期间,静小风频率较高;系统风与山谷风方向相反时,山谷风高度内多为静小风。冷锋过境时不会出现山谷风。

英文摘要：

Based on the baseline pilot balloon data observed during October 15th to November 16th in 2008, the characteristics of mountain-valley breeze in Conghua, Guangzhou are analyzed. It was found that the mountain-valley breeze is significant when the system wind is weaker than 1.5 rods. The valley breeze prevailed at local time from 10：00 to 18：00 when it was weaker than mountain breeze. The thickness of mountain-valley breeze was about 300 m while the return-flow appeared between 300 and 700 m. The frequency of calm wind was higher during the period of mountain-valley wind transformation. While the direction of the weaker system wind was opposite to the mountain-valley wind, the wind speed was calm or smaller within the height of the mountain-valley breeze. When a cold front passed by, there was no mountain-valley breeze.