摘要
背景误差协方差特征与区域的天气气候特征密切相关。为了更好地理解中国华东地区和青藏高原地区的背景误差协方差特征,利用夏季一个月的模拟结果,以最新的多元变量相关的背景误差协方差模型为基础,通过提取隐含背景误差协方差中的变量相关系数、特征值、特征向量和特征长度尺度等,对这两个区域的背景误差协方差特征进行比较和分析。结果表明,相对于华东地区,青藏高原地区变量之间的影响关系更显著,背景场的误差更大,大气特征具有更强的局地性。对青藏高原地区资料同化而言,观测资料占有更大的权重和更小的影响范围,对青藏高原地区观测资料提出了更高的要求。
The characteristics of background error covariances have a close relationship with the local meteorological features. In order to get a better understanding for the characteristics of background error covariances in East China and the Tibetan Plateau,the major parameters of background error covariances,such as variable correlation coefficients,eigenvalues,eigenvectors and characteristic length scales,were compared and analyzed using one month series of numerical forecast fields in summer based on the latest model of multivariate background error covariances. Results show that the relationships between different variables in the Tibetan Plateau are more notable than those in East China. In the Tibetan Plateau,the deviation of background error is more obvious and the local property of atmospheric characteristics are stronger. In terms of data assimilation in the Tibetan Plateau,the observations occupy more weight and smaller influencing area,which puts forward higher requirements on observations in the Tibetan Plateau.
出处
《大气科学学报》
CSCD
北大核心
2015年第5期650-657,共8页
Transactions of Atmospheric Sciences
基金
国家重点基础研究发展计划(973计划)项目(2013CB430102)
公益性行业(气象)科研专项(GYHY201506002)
国家自然科学基金资助项目(41205082)
关键词
资料同化
背景误差协方差
青藏高原
华东地区
data assimilation
background error covariance
Tibetan Plateau
East China
作者简介
通信作者：陈耀登，博士，副教授，研究方向为气象资料同化，keyu@nuist．edu．cn．
