Study On Sand Storm And Sand-blowing Various In Chifeng

Chifeng area located at east of the Inner Mongolia Autonomous Region, upstream of Xiliao River, southwest of Daxinanling Montain . Meets the compound spot of the inner Mongolian plain, north the Xiliao River plain, Mt. yanshan. Influenced by the Keerqin desert and the muddy Hunshandake sand, the sand dust weather appearance nearly every year. Because of the sand dust initiated, the climatology influence the human survival environment as well as the economical, the social activity, we have realized that the sand dust weather is one of noticeable atmospheric and ecological environment questions. For the forecasting and the prevention of sand dust weather, reduces the harm of the sand dust weather, we should analysize the sand dust weather change tendency, as well as completes the sand dust weather forecasting and the prevention work, carries on the construction of the ecological environment to reduce the sand dust weather.This study first uses Skipped t investigation spection method to analyze the change tendency and the jump change of the sand dust weather, the results shows,there are a increase tendency for annual various of the sand dust weather especially, sand dust weather rapidly reduced in 90's,, there is no dust storm occurred in some years , It can be saw the sand storm and sand-blowing had not remarkable periodic change with the power spectrum analysis method .With statistics method, analyzed the sand dust weather annul change in Chifeng , the seasonal variation, the daily variation and the spatial variation. Pointed out sand dust weather is the most in spring, is the least in the autumn Between 11 to 18 it is most when thermal strongly energy unstable time appears, appears the least number of times before dawn. There are the most number in Wudan and the least in Keqi , the reason is the influence of the Knorchin desert.The relation of Daily number change of sand dust weather and the meteorological elements is: The number of gale date, the wind speed ,they have a better correlation and inverse correlation with evaporates, the precipitation preliminary, also has the certain relations with the ground temperature, the accumulated snow. The more snowy day the less of gales date . On behalf of the power influence are gale date numbers, the intensity factor of North Pole current and so on Asian North Pole current area index,and they are the leading factor of the sand dust weatherThe gale circulation situation that can trigger the sand dust weather are divided into: High cold current and Mongolian high pressure front part, high channel and cold front transiting on the ground, high channel in frontof high pressure , west air or northwest air and high pressure in south and low pressure in north, high current and high pressure in south and low pressure in north.The warming climate is a problem faced in the whole world, it' s function in dust and sand weather is to promote in theory, but the reduction of dust and sand weather in recent years prove it is might reduce dust and sand weather. The construction of the shelter forest in the three northern areas of China, have reduced the dust and sand weather, make the ecological environment of the area of Chifeng improve greatly , people's living environment also is improved.