国外几套再分析资料的对比与分析

Comparative Analysis of NCEP/NCAR,ECMWF and JMA Reanalysis

针对目前最主要的3种再分析资料NCEP、ECMWF、JMA,从各家再分析中心所采用的同化方案、所用到的数据、质量控制方法及相关的偏差校正方法方面,进行相关介绍和对比,以便对再分析资料的特点有更为充分的了解,对我国未来再分析工作的发展起到借鉴作用。通过对比发现,各家再分析中心采用的同化方案主要为三维、四维变分方法和最优插值法。各家最主要的差别在于所选用的数据类型不同,以及所采用模式在分辨率上的差异。此外,还从经验出发简要给出了各类再分析资料在不同方面的优缺点,从而为各类再分析资料的选择使用方面提供参考。简单陈述了国内再分析工作的进展,并给出了提高我国再分析工作质量所需要关注和亟待解决的问题。

An introduction of the main reanalysis data of NCEP,ECMWF,JMA and the preliminary comparison among them are given from the following aspects：（1） assimilation systems,including the assimilation module and method; （2） the data used in the reanalysis; and （3） the methods of quality control and bias correction. The main assimilation methods of all reanalysis datasets include the 3D variational method,4D variational method,and optimum interpolation. The dominating differences of these reanalysis datasets are data types and the resolution of modules. In addition,the advantages and deficiencies of these reanalysis datasets are given by empirical analysis. It is helpful for selecting the correct reanalysis dataset. The advances in reanalysis in China ars introduced simply and some problems on the improvement of the reanalysis in China are discussed.