一种四维同化方法的试验研究

EXPERIMENTS OF A FOUR DIMENSIONAL DATA ASSIMILATION SCHEME

文章利用一个有限区模式对一种资料四维同化过程作了试验研究，以考察四维资料同化对模式的预报过程的作用。试验结果表明：四维资料同化可以为模式提供一组四维动力协调的积分初值。对由于资料或模式原因造成的积分开始时的高频振荡有很好的抑制作用，使模式的积分稳定性增强。

A four-dimensional data assimilation(FDDA)scheme has been studied to investigatethe effect of the FDDA on numerical prediction,using a limited-area model. The results show that FDDA can provide a integrated first guess with four-dimensional dynamic consistency for the model and suppress the high frequencyfluctuation caused by the data or the model itself at the begining of the integration,andthus raise the stability of the model.