In recent 40 years in Northern China the space-time abnormity characteristics and its climatic formation cause of sand-dust storm days number change were analyzed utilizing EOF and circumfluence synthesis statistic method.

• 摘要利用EOF和环流合成统计方法，分析了我国北方近40年来沙尘暴日数变化的时空异常特征及其气候成因。