ERA Interim再分析资料的云量可靠性分析——以太原和五寨为例  

Cloud reliability analysis of ERA Interim reanalysis data:taking Taiyuan and Wuzhai as examples

作　　者：杜晖 贾晓红 尚子溦 尚可政[1] Du Hui;Jia Xiao-hong;Shang Zi-wei;Shang Ke-zheng(Key Laboratory of Arid Climate Changes and Disaster Reduction of Gansu Province,College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China;Inner Mongolia Service Center of Meteorology,Hohhot 010051.China;Meteorological Bureau of Lanzhou,Lanzhou 730000,China)

机构地区：[1]兰州大学大气科学学院,甘肃省干旱气候变化与减灾重点实验室,兰州730000 [2]内蒙古自治区气象服务中心,呼和浩特010051 [3]兰州市气象局,兰州730000

出　　处：《兰州大学学报（自然科学版）》2020年第2期253-259,共7页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(91644226);国家基础科技条件平台建设项目(NCMI-SBS17-201807,NCMI-SJS15-201707)。

摘　　要：利用气象信息综合分析处理系统地面实况报文和欧洲中期天气预报中心再分析(ERA Interim)的4次/d总低云量资料,对比分析了再分析资料对太原和五寨总低云量的代表性.结果表明,太原和五寨不同观测时次总云量和低云量多年平均(2002年2月1日-2013年12月31日)观测值与ERA Interim再分析云量变化趋势较为一致,除02:00外,08:00、14:00、20:00的ERA Interim再分析资料均偏低,ERA Interim低云量均低于观测值.总云量月平均值ERA Interim资料高于站点观测值,14:00偏差较大.太原和五寨不同观测时次总云量累积分布趋势整体较一致.太原和五寨总云量的相关系数在0.6以上,08:00和14:00相关系数在0.7以上.低云量相关系数明显低于同时次的总云量相关系数,低云量不同月份不同时次的相关系数差异较大,总云量平均绝对误差相差不大;低云量平均绝对误差部分时次较大.Using meteorological information comprehensive analysis and processing system ground observations and European Centre for medium-range weather forecast reanalysis of interim(ERA Interim)four-low and total-cloud cover data per day,we compared and analyzed the representative reanalysis data on the total and low cloud cover of Taiyuan and Wuzhai.The results showed that the annual average and total and low cloud cover(2002-02-01-2013-12-31)observations of Taiyuan and Wuzhai were consistent with the changing trends of ERA Interim reanalysis of cloud cover,except for 02:00;ERA Interim reanalysis data was low at 08:00,14:00,and 20:00,and ERA Interim’s low cloud amount was lower than the observed value.The ERA Interim total cloud monthly average was higher than the site observation value,and the deviation was larger at 14:00.The cumulative distribution trend of total cloud amount in Taiyuan and Wuzhai was generally consistent.The cumulative distributions of low cloud accumulation were larger than that of the total cloud.The correlation coefficients of the total cloud amount in Taiyuan and Wuzhai were above 0.6,while those of 08:00 and 14:00 were above 0.7.The correlation coefficients of the low cloud cover were significantly lower than those of the total cloud cover at the same time.There was a large difference in the correlation coefficient between different periods of low cloud and different months.And the average absolute errors of the total cloud amount exhibited little difference.The average absolute errors of the low cloud amount were relatively larger.

关 键 词：总云量 低云量 再分析资料 可靠性 

分 类 号：P426.5[天文地球—大气科学及气象学]