上海虹桥机场风向日变化特征分析

文章利用2010-2019年上海虹桥机场地面风场逐时观测数据,统计了不同季节各风向段出现频率日变化特征,结果表明:虹桥机场东风(80°-110°)、东南风(120°-150°)日变化规律显著;各季节东南风频率曲线呈准正弦波型,春夏季日较差、极大值高于秋冬季;东风日变化规律季节性变化比弱于东南方,夏秋季东风日变化强于冬春季节。东南风与东风频率极大值、极小值出现时间四季基本相同。造成风向日变化的原因是因为上海地区存在南支海风环流和东支海风环流,两支环流均可能影响虹桥机场,最可能影响时间为15:00-19:00和14:00-18:00,各季节略有差异。

Based on the hourly observation data of surface wind field in Shanghai Hongqiao Airport from 2010 to 2019,the diurnal variation characteristics of wind frequency in different seasons are calculated.The results show that the diurnal variation of easterly wind(80°-110°)and southeasterly wind(120°-150°)in Hongqiao Airport is significant,the frequency curve of southeasterly wind in each season is quasi-sinusoidal,and the diurnal difference and maximum in spring and summer is higher than that in autumn and winter.The diurnal variation of easterly wind is weaker than that of southeast,and the diurnal variation of easterly wind in summer and autumn is stronger than that in winter and spring.The occurrence time of the maximum and minimum frequency of southeasterly wind and easterly wind is basically the same in four seasons.The reason for the diurnal variation of wind direction is that there are sea breeze circulation in the south branch and sea breeze circulation in the east branch in Shanghai area,both of which may affect Hongqiao Airport,and the most likely the times are 15:00-19:00 and 14:00-18:00,which vary slightly from season to season.