内蒙古地区沙尘天气频率及其影响因素分析

基于内蒙古中西部地区45年（1961～2005年）的气象资料、沙尘暴资料，讨论内蒙古中西部地区沙尘暴频率变化趋势和气候动力因子对沙尘暴频率的影响。利用风速、降水量、蒸发量、相对湿度、大风日数等基本气象资料，建立新的影响沙尘天气的气候影响指数D模型，该模型不仅考虑影响沙尘暴的动力条件，而且也把影响沙尘暴发生的下垫面稳定情况纳入模型，所模拟的结果更趋近于现实。对各气象站计算的结果显示，气候影响指数D模型与沙尘天气频率有很好的线性关系，这种线性关系具有明显的区域特征。

SAND-DUST EVENTS FREQUENCY AND INFLUENCING FACTORS IN INNER MONGOLIA

By analyzing the 45 years （1961 - 2005） of meteorological data and Sandstorm informationof central and western regions of inner Mongolia, this article discuss the tendency of dust storm frequency and the influence of climate power factor of central and western regions of Inner Mongolia,making use of wind speed, precipitation, evaporation, relative humidity, days of strong wind , and other basic meteorological data to set up a new model of climate index 1） ,which is affecting of sandstorm. A new climate impact index D model, which not only considered the impact of dynamic conditions of the sandstorm, but also considered the underlying conditions which impact the Occurrence of sandstorms. And put the underlying conditions into the model, so the simulation results more close to reality. The results of calculation in all weather situations show that the climate impact index D model and the dust weather frequency has a good linear relationship, this linear relationship has obvious regional characteristics.