渤海偏东风对北戴河区降水及温度影响统计分析

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。

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

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.