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5 期 白爱娟等：华山景区大风变化特征及偏南大风的天气学研究 1163
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Analysis on the Variations of Gales and Two Southerly Gale Events in
Huashan Mountain Scenic Spot

3
1
1
BAI Aijuan ，ZHANG Yonghong ，WU Jiahao ，YU Jinjiang ，Ding Limin 3
2
（1. Chengdu University of Information Technology，Chengdu 610225，Sichuan，China；
2. Weinan Meteorological Administration，Weinan 714000，Shanxi，China；
3. Huashan meteorological station of Huayin city，Weinan 714200，Shanxi，China）
Abstract：This paper analyzed the variations on different time scales of gales in the Huashan mountain scenic
spot of Shaanxi，by using the hourly observations from the year of 2012 to 2017 in the Huashan’s station. Two
representative southerly events were analyzed in this paper to get the mechanism of gales of Huashan. The main
conclusions were as follows. Taking the wind velocity of more than 17 m·s as a thread，the gales of Huashan
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tended to occur from 21:00（Beijing Time the same as affer）to the next early morning frequently，on the con‐
trary，less gales occurred after noon and before 20:00. The southern peak located at higher altitude and more
southward position，so it encountered more southerly gales. The Huashan station meet with not only southerly
gale，but also northwestern strong wind，because of its northerly position and lower altitude. During the two gale
southerly events，the similar circulation of characterized by‘East High and West Low’at the low-level was ex‐
plored. Huashan was located in the contour-intensive transition region of from North China High to Northwest
Low. The dynamic theory of gradient wind resulted in the high velocity. Before the gales，the 3h variable pres‐
sure field displayed a strong negative center of lower than -4 hPa in central Shaanxi，which made the conver‐
gence and ascending motion. At the same time，the southerly alee was accelerated in the night and enforces the
gales，accompanied with the instability-ascending motion. The significant temperature and pressure changes
were found before the strong wind. In the autumn gale，the temperature decreased by 5 °C 3 hours before the
maximum velocity，accompanying the pressure decreased by 4 hPa about 7 hours before. The early changed pres‐
sure and temperature can be the important factors of wind forecasting. From the observations of Jinghe radar site，
100 km away from Huashan，the echoes in the Huashan gale were weakened and cannot display the extreme ve‐
locity，because of the terrain occlusion of high mountain peaks.
Key words：Gale；Huashan Mountain Scenic Spot；gradient wind；atmospheric circulation；pressure variation