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投稿时间:2008-03-05 修订日期:2008-05-07
投稿时间:2008-03-05 修订日期:2008-05-07
中文摘要: 理论上,集合卡尔曼变换(ETKF——The Ensemble Transform Kalman filter)方法产生的
集合扰动在观测空间具有等概率分布的特征,这一特点恰好可以弥补业务集合预报中常用的
初值生成方法——Breeding 方法的不足。依据ETKF理论和方法,利用GRAPES Meso中尺度
模
式建立了简单的基于ETKF的中尺度集合预报试验平台,并选取2005年11月8—12日出现的一
次降雨过程进行集合预报试验,旨在研究ETKF方法用于集合预报时,对随时间变化的区域非
线性系统,在有限集合数的条件下的特征。试验结果揭示了利用ETKF方法进行实际区域模式
下集合预报的可行性及其一些基本性质,并指出试验当中存在的不足及今后研究的重点。
Abstract:In theory the disturbance generated by the ETKF (Ensemble Transform Ka
lman filter) method has the same probability in the observation space, so it can
complement the shortage caused by the ensemble generation scheme Breeding.
Based on ETKF theory, a simple mesoscale ensemble system is built usin
g the GRAPES Meso model and a case of rainfall occurred at 8th to 12th Nov
2005 is studied in order to verify whether such method can be applied into an i
mperfect time varying regional ensemble model with limited ensemble member. The experiment
s indicate that this method can be used into the regional ensemble system,and it
also can maintenance its priority, and the experimental shortcomin
gs and the study focus in the future are also indicated.
keywords: ETKF ensemble forecast ensemble disturbs
文章编号: 中图分类号: 文献标志码:
基金项目:
Author Name | Affiliation |
Tian Weihong | National Meteorology Center, Beijing 100081 |
Zhuang Shiyu | State Key Laboratory Severe Weather, Chinese Academy of Meteorological Sciences |
引用文本:
田伟红,庄世宇,2008.ETKF方法在区域集合预报中的初步应用[J].气象,34(8):35-39.
Tian Weihong,Zhuang Shiyu,2008.Application of ETKF Method to Regional Ensemble Forecasts[J].Meteor Mon,34(8):35-39.
田伟红,庄世宇,2008.ETKF方法在区域集合预报中的初步应用[J].气象,34(8):35-39.
Tian Weihong,Zhuang Shiyu,2008.Application of ETKF Method to Regional Ensemble Forecasts[J].Meteor Mon,34(8):35-39.