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国家气候中心全球海洋资料四维同化系统在热带太平洋的结果初步分析
引用本文:刘益民,李维京,张培群.国家气候中心全球海洋资料四维同化系统在热带太平洋的结果初步分析[J].海洋学报,2005,27(1):27-35.
作者姓名:刘益民  李维京  张培群
作者单位:国家气候中心, 北京, 100081
基金项目:“九五”加强课题“短期气候预测系统业务化”.
摘    要:介绍了国家气候中心(NCC)“全球海洋资料四维同化系统”(简称NCC-GODAS).该系统包含观测资料预处理系统、插值分析系统和所应用的动力模式.插值分析系统采用四维同化技术方案,在时间上设置一个4周的窗口,将此窗口之内的观测资料以一定的权重插入插值分析系统,在空间上采用三维变分方案.海洋动力模式为“九五”期间LASG研制的L30T63OGCM 1 0版本.文中考察了该系统从1982年到2003年3月在热带太平洋的部分同化分析结果,并与NCEP的再分析资料和EMC/NCEP的太平洋区域海洋资料同化系统的结果进行了对比分析.结果显示,该系统的同化结果(如SST,SSTA,Nino指数,次表层海温变化等)与NCEP的同期同化结果具有很好的一致性.同时,该系统得出的海洋同化资料气候场与海洋模式气候场相比,有显著的改进.表明该系统具有较好的同化能力,其同化结果可为海-气耦合模式进行季节和跨季节的气候预测业务提供可信的海洋初始场资料,同时还可以为相关研究提供海洋分析场.

关 键 词:海洋资料同化  资料预处理    海洋动力模式    三维变分    时间窗口    SST    Nino指数
文章编号:0253-4193(2005)01-0027-08
收稿时间:2003/12/15 0:00:00
修稿时间:2004/8/20 0:00:00

A global 4-dimensional ocean data assimilation system and the studies on its results in the tropic Pacific
LIU Yi-min,LI Wei-jing and ZHANG Pei-qun.A global 4-dimensional ocean data assimilation system and the studies on its results in the tropic Pacific[J].Acta Oceanologica Sinica (in Chinese),2005,27(1):27-35.
Authors:LIU Yi-min  LI Wei-jing and ZHANG Pei-qun
Affiliation:National Climate Center of China, Beijing 100081, China
Abstract:We introduce a global 4-dim ensional ocean data assmiilation system,as one part of operational dynamic model system of National Climate Center,which is routinely serving the marine initial fields for operational dynamic model system.Th is system mainly contains 4 parts such as pretreating data,variation interpo lating and ocean dynamic model and post-treating.Pretreating data inc ludes collect ing data,decoding data and data quality control.A3-dmi ensional variation method is used in our system on the spatial.Meanwhile,a time-window,about 4-weeks,is opened in order to obtain asmore observation information as possible.L30T63OGCM Version 1.0,which is established and developed by LASG,is selected as the dynamic model of our system.Using the observation data from 1981 to 2003,we have performed a series of numerical expermients on this system.It is illustrated that the results of this system in the region of the middle Pacific,for instances SST,SSTA,Nino index,sub-surface temperature,etc.,are coincided with corresponding results of NCEP's very well.Therefore,this system's results can be used as the initial fields of relevant ocean dynamic model system as well as a kind of reanaly zed data sets.
Keywords:ocean data assimilation  data pretreating  dynamical ocean model  3-dimensional variation  time-window  SST  Nino index
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