渤海偏东风对北戴河区降水及温度影响统计分析

The Statistical Analysis on the Impact of Easterlies of Bohai Sea on the Precipitation and Temperature in Beidaihe Area

利用2001—2010年1～12月北戴河观测站气象资料,筛选出401个样本个例,应用常规统计学方法及天气学理论,按不同分级统计分析降雨(雪)前6～8 h风向、风速及转为海风时温度变化基本数据,计算不同分级相关系数值,得出海上偏东风与降水、温度半定量化估计值。并用临近4个观测站同步资料对比分析,偏东风动态变化对岸区强降水落区具有指示意义;北戴河至内陆延伸温度梯度估计值为:夏季平均值0.6℃/10 km,冬季0.3℃/10 km;为单站精细化预报方法研究及中尺度数值模式检验提供基本依据。

Using data from January to December months in the years of 2001-2010 in Beidaihe area, the paper screened 401 samples by the typical statistics method and meteorological theory, analyzed the wind speed and direction during 6-8 hours before raining or snowing, counted the data while the wind direction changed to sea breeze, by way of calculating correlation coefficient in the different grades, the semi-quantitative estimated value has been obtained on the impact of the easterlies to the precipitation and to the temperature over sea. By means of contract data synchronously with adjacent 4 observatories, the watching changes of the easterlies can visibly indicate the severe precipitation area. From Beidaihe coast to farther land, estimated value of temperature gradients are 0.6 ℃/IO km in summer, 0.3℃/10 km in winter, that can provide scientific basis for the study of the precise forecast method and for testing meso-scale numerical model.