海上偏东风对秦皇岛岸区降水及温度的影响

利用2001～2010年逐月秦皇岛、昌黎、抚宁及青龙观测站气象资料,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、风速及转为海风时的温度变化基数据,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。临近4个测站同步资料对比分析结果表明,偏东风动态变化对岸区强降水落区具有指示意义;秦皇岛岸区至内陆延伸水平温度梯度估计值为:夏季8:00～14:00平均值0.6℃/10 km,冬季0.3℃/10 km。

Analysis on the Impact of Offshore Easterlies on the Precipitation and Temperature in Qinhuangdao Coastal Area

According to the monthly observation data in Qinhuangdao,Changli,Funing and Qinglong stations in the year of 2001-2010,401 sample cases were selected.By using the conventional statistical method and synoptic theory,the wind direction and speed 6-8 h before rainfall or snowfall as well as the temperature change when the wind turned to sea wind were analyzed in different grades,and the correlation coefficients of each grade were calculated.The semi-quantitative estimated value has been obtained about the impact of the offshore easterlies on the precipitation and temperature over sea.By analyzing the synchronized data of the adjacent four stations,the dynamic change of easterlies was indicative of the strong rainfall area at the coastal districts;the estimated value of temperature gradients from the coastal area to the inland of Qinhuangdao was 0.6 ℃/10 km in summer and 0.3 ℃/10 km in winter from 8:00 to 14:00.