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中文摘要：
为了对台风流场的复杂结构进行研究，采用二次变分方法对台风风场进行分解．首先，将台风的流场分解成最大的、不对称的涡旋流场和无旋流场；然后将不对称的涡旋流场分解成最大的对称涡旋和不对称的β涡旋对；最后，利用WRF（weather research and forcasting）模式（V2．1．2）模拟了200601号珍珠台风，并对各时次的500hPa风场用该方法进行分解，结果表明：该方法对台风的运动机理研究和实际的台风路径预测提供了有价值的信息．
英文摘要：
The present paper is concerned with characteristics of flow structures of typhoons, and the double variational method is applied. First, the typhoon flow field is decomposed into two parts： the maximum asymmetric vortex and irrotational environmental flow field. Then the maximum asymmetric vortex is also decomposed into two parts： the maximum symmetric vortex andβ-gyres. Finally, typhoon Pearl（2006） is simulated by WRF model（weather research and forcasting model）, and flow fields at various times at 500 hPa are decomposed using the above method. It turns out that the decomposed flow fields arc useful for researches on motion and track prediction of typhoons.
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