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投稿时间:2007-08-31 修订日期:2008-04-08
投稿时间:2007-08-31 修订日期:2008-04-08
中文摘要: 在观测资料同化系统中,观测误差均方差与背景场误差均方差共同决定着观测信息与背景场
信息的相对重要性以及这些信息在空间及不同变量间的扩展方式,故在资料同化系统中起到
决定性作用。因此,观测误差均方差的合理估计是非常重要的。采用贝塞尔函数拟合方法,
从探空观测资料与背景场的偏差(IV)协方差中分离出探空资料的观测误差均方差与模式的
背景场误差均方差;再从其他观测资料偏差协方差中扣除背景场误差均方差来估计其它观测
误差均方差。观测误差均方差分析使用2006年8月1—31日观测资料,国家气象中心T213L31
全球中期分析预报系统的6小时预报作为背景场。结果显示估计的观测误差均方差是比较合
理的。
Abstract:It is important to suitably estimate the root mean square of observation error i
n a given assimilation system. Firstly, by using Bessel fitting method, the root
mean square of observation error and root mean square of first guess error are
separated from the covariance of the deviation of radio sounding observation an
d first guess. Then the root mean square of other observation error for other ob
servation types are estimated by deducting the root mean square of first guess e
rror from the covariance of the deviation of radio sounding observation and fir
st guess. The observation data during 1-31, August 2006 and the first guess from
T213 numerical weather prediction system are used for analyzing the root mean s
quare of observation error. The results show that the estimated root mean square
of observation error for each observation type is reasonable.
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引用文本:
陶士伟,郝民,薛纪善,窦以文,2008.数值预报同化系统中观测资料误差分析[J].气象,34(7):34-40.
Tao Shiwei,Hao Min,Xue Jishan,Duo Yiwen,2008.Analyses of Observation Data Error in Numerical Forecasting Assimilation System[J].Meteor Mon,34(7):34-40.
陶士伟,郝民,薛纪善,窦以文,2008.数值预报同化系统中观测资料误差分析[J].气象,34(7):34-40.
Tao Shiwei,Hao Min,Xue Jishan,Duo Yiwen,2008.Analyses of Observation Data Error in Numerical Forecasting Assimilation System[J].Meteor Mon,34(7):34-40.