五华国家基本站新旧址观测数据差异分析

Difference analysis on observation data between the new and old national base weather station in Wuhua

利用差值分析方法对五华国家基本站新旧址的观测资料进行分析,结果表明:(1)新址平均气温、最高气温、最低气温均小于旧址,年平均气温差值为0.9℃,年平均最高气温值差值为0.4℃,年平均最低气温差值为0.2℃;(2)新旧址气压平均差值为1.7hPa,气压差异的月变化不明显。平均相对湿度差值为5%;(3)新址的平均风速明显大于旧址,新址全年SW风向频率最多,旧址NNE风向频率最多。(4)雨量为小雨级别时新旧址雨日一致性比较好,1～3月、10～12月各降水量级别新旧址雨日一致,4～9月差异较大。(5)新旧址各层土壤温度变化规律基本一致,160cm地温差值最大,320cm地温差值最小。

By means of difference analysis,observation data between the new and old national base weather station in Wuhua are analyzed.The results show that the average temperature,maximum temperature and minimum temperature in the new site are less than the old one.Differences of annual mean temperature,annual mean maximum temperature and annual mean minimum temperature between the new and old weather station are 0.9℃,0.4℃,0.2℃respectively.The pressure and average relative humidity differences in these two sites are 1.7hPa and 5% with less obvious monthly variation.The average wind speed of the new site is significantly greater than that of old one.Annual wind direction frequency SW is most in the new site,while NNE frequency is most in the old site.When it is in a light precipitation,the rainy days of these two stations are more consistent in a certain extent,especially from January to March and from October to December.There exists obvious differences from April to September.Variations of soil temperature in different layers are basically identical between the two sites.The maximum and minimum differences for the ground temperature appear in the layer of 160cm and 320cm.