四川新津机场地面风场的特征分析

Characteristic Analysis on Surface Wind Field at Xinjin Airport in Sichuan

利用2005年1月—2010年2月自动气象站的地面风观测资料,分析了四川新津机场地面风的平均日变化、月变化、季变化及年际变化等,讨论了地面瞬时风与机场跑道的关系,并对≥5 m.s-1地面瞬时风的预报进行了探索。结果表明:机场主要受偏北风、偏西南风和偏东南风影响,且偏北风和偏东南方向风速较大。全年较大风主要出现在春季。各季节均盛行偏北风,秋、冬季偏北风出现的频率远大于春、夏季。下午风速大,早晨和夜间风速小。全年平均风速小,年际差异小,微风和静风频率高。持续时间较长的≥5 m.s-1地面瞬时风的预报重点在于天气系统的预报上。

Based on the observational surface wind data at Xinjin airport in Sichuan Province from January 2005 to February 2010,the diurnal change of seasonal mean,seasonal and annual variation features of surface wind at Xinjin airport are statistically analyzed.The relation between surface instantaneous wind and airport runway is studied and the forecast of surface instantaneous wind with wind velocity ≥5 m·s-1 are explored.The results indicate that the airport are mainly affected by north wind,west wind and southeast wind;the wind velocities of north and southeast winds are the largest;the strong wind mainly appeared in spring.Furthermore,the north wind is common in every season.However,the frequency of north wind appeared common in autumn and winter is far more than that in spring and summer.The wind velocity gradually increases in the morning and reaches the maximum value on the afternoon,and then it begin to gradually decrease at nighttime.Comparing with the daytime,its change is smaller than that at night.Annual mean wind velocity is small with small interannual change,static wind and small wind have high frequency.The surface instantaneous wind with wind velocity ≥5 m·s-1 and lasting for a long time is the forecasting emphasis of the weather system.