中文摘要：

针对台风Bogus三维变分同化现有方法所存在的不足，引入台风移向、移速等客观因素构造出非对称台风风场模型，并与QuikSCAT风场产品相结合共同改善模式初始场。通过对比初始场增量发现，同化台风Bogus资料能较好地订正出包括高空反气旋环流在内的整层大气环流特征，而QuikSCAT风场资料则主要改善了底层环流特征，修正了台风中心位置，并且部分弥补了Bogus资料影响范围有限这一不足。接着通过设计试验方案对“云娜”台风加强阶段进行了模拟研究，结果表明：在变分同化系统的约束下，背景场、Bogus资料与QuikSCAT风场资料较协调地结合在一起，提高了台风路径及强度模拟水平，尤其是底层内外物理量的共同改进，对台风的模拟效果有明显的正效应。

英文摘要：

Aiming at the shortcomings of existing methods of Bogus Three Dimension Variation Assimilation （3DVAR）, this paper introduces some objective factors such as the typhoon moving speed, direction into constructing the asymmetric Bogus wind model, which combines with QuikSCAT wind field product to improve model initial fields. It is found that, by contrasting initial field increment, the assimilation of Bogus data can better revise the whole-colunm initial field including the high-altitude anti-cyclonic circulation and the QuikSCAT wind field data improve mainly the bottom circulation so that the typhoon center are corrected, and partly make up this shortage of the Bogus impacting limited scope. Then the experiment schemes are designed to simulate the strengthening phase of Typhoon Rananim. The results show that, under constraints of the variation assimilation system, the background field, Bogus data and QuikSCAT wind field are combined in harmony, and improve the typhoon simulation of track and intensity, and especially improvements of the inside and outside physical fileds have a significant positive effect to the typhoon simulation.