四套土壤湿度再分析数据在中国西北东部—华北—江淮地区的适用性研究

发布时间：2018-08-30 11:25

【摘要】：基于1992~2010年全国778个农业气象站土壤湿度观测资料、ERA-Interim、JRA55、NCEP-DOE R2和20CR土壤湿度再分析资料,通过平均差值、相关系数、差值标准差、标准差比四个参数,利用Brunke排名方法和EOF(Empirical Orthogonal Function)分析,对四套土壤湿度再分析资料在中国西北东部—华北—江淮区域的适用性进行了分析。主要结论如下:不同季节的平均偏差空间分布上,JRA55资料同观测数据的平均偏差在±0.08m~3 m~(-3)之间,春、夏季西北东部JRA55土壤湿度偏小,ERA-Interim、NCEP-DOE R2、20CR资料较观测数据偏湿,华北南部、江淮地区平均偏差小于西北东部、华北北部。在年际变化上,各个季节ERA-Interim资料同观测资料最为接近,能稳定地再现西北东部、华北、江淮地区土壤湿度干湿变化趋势,反映出重要的旱涝年。整体而言,四套再分析资料中ERA-Interim资料同观测资料接近,JRA55、NCEP-DOE R2资料次之,20CR资料最差。
[Abstract]:Based on ERA-Interimm JRA55 NCEP-DOE R2 and 20CR soil moisture reanalysis data from 778 agricultural meteorological stations in China from 1992 to 2010, the average difference, correlation coefficient, difference standard deviation and standard deviation ratio were analyzed by Brunke ranking method and EOF (Empirical Orthogonal Function). The applicability of four sets of soil moisture reanalysis data in North China-Jianghuai region was analyzed. The main conclusions are as follows: the average deviation between JRA55 data and observed data in different seasons is between 卤0.08m~3 m ~ (-3). In spring and summer, ERA-Interimn NCEP-DOE R220CR data are wetter than observational data in spring and summer. The average deviation in Jianghuai area is less than that in the east of northwest and north of North China. In terms of interannual variation, the ERA-Interim data in each season are most close to the observed data, and can steadily reproduce the soil moisture and dry change trend in the eastern part of the northwest, North China and Jianghuai areas, reflecting the important drought and flood years. As a whole, the ERA-Interim data of the four sets of reanalysis data are close to that of the observational data, and the data of NCEP-DOE R2 of JRA55 and NCEP-DOE are the worst.
【作者单位】：南京信息工程大学气象灾害教育部重点实验室;南京信息工程大学气候与环境变化国际合作联合实验室;南京信息工程大学气象灾害预报预警与评估协同创新中心;
【基金】：国家自然科学基金项目41005047、41405066 江苏高校优势学科建设工程资助项目(PAPD) 高等学校博士点学科专项科研基金项目20113228120002~~
【分类号】：S152.71

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