The persistence of dry warmer sector in winter in northwest of china is the index of its occurrence . moreover , the sand over the ground surface also provided a favorable substance condition . sand - dust weather in qingdao occurred frequently in spring 蒙古气旋和西北强冷空气是“ 3 . 20 ”强沙尘暴最主要的天气形势和动力机制；冬季北方干旱少雨、沙尘裸露面大提供了物质基础。
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The ncep / ncar globally tropospheric 1 1 reanalysis data have been employed to select six landfall typhoon cases in order to diagnose variations of typhoon warm sectors in atmospheric boundary layer during their whole life periods 摘要采用ncep / ncar全球对流层1 1再分析格点资料，选取6个登陆台风个例，分析了不同发展阶段台风大气边界层暖区变化的特征及其与强度变化的关系。
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