关键词: 河西走廊, 沙尘暴, 海温, 相关分析, 预报方程

Abstract: Sand dust storm is an important process of desertification, and it needs studying from many filed. The phenomenon, El Ni o, is mainly an abnormal increasing of sea surface temperature in area of middle and eastern Pacific ocean near the equator. Once it appear, strong heating source formed in it will produce a deep influence to weather and climate in the tropics and middle and high latitude regions. So far, to study the teleconnections between El Ni o phenomenon and weather as well as climate in some region is an important method for long weather forecast and climate predicting. The teleconnections of sand dust storm's frequency over Hexi corridor in Gansu Province and sea surface temperature in area of the middle and eastern Pacific ocean near equator has showed that:The correlation coefficients between sand dust storm's frequency in Spring and sea surface temperature in Autumn and Winter of a year before last year are negative and the best, and that means when sea surface temperature in area of the middle and eastern Pacific ocean near equator in Autumn and Winter are high (or lower), the sand dust storm's frequency over Hexi corridor in the Spring after two years is less (or more); The correlation coefficient between sand dust storm's frequency in Summer and sea surface temperature in Spring and Summer of a year before last year are negative and the best, and that means when sea surface temperature in area of the middle and eastern Pacific ocean near the equator in Spring and Summer are high (or lower), the sand dust storm's frequency over Hexi cooridor in the Summer after two years are less (or more). For every months in Spring the correlation coefficients between sand dust storm's frequency in March and sea surface temperature is as similar as whole Spring; In April, only the correlation coefficient between sand dust storm's frequency and sea surface temperature in September of a year before last year is negative and the best; In May the situation is between Spring and Summer. Thus, it is concluded that the sand dust storm's frequency over Hexi corridor in Spring can be predicted by using the past sea surface temperature in area of the middle and eastern Pacific ocean near the equator.

Key words: Hexi corridor, Sand dust storm, Sea surface temperature, Correlation analysis, Forecasting equation