Research on occurrence mechanism and transport path of Saline-Alkaline Dust Storms at the dry lake beds in Inner Mongolia
,2, Lianyou Liu1
,2, Jie Lei1
,2, Yanyan Yang1
,2, Haiming Wen1
1Key Laboratory of Environmental Change and Natural Disasters, Beijing, China, 2Academy of Disaster Reduction and Emergency Management, Beijing, China
The decline and fall of the lakes in arid areas will trigger environmental and ecological disasters. Most parts of Inner Mongolia belongs to the arid and semi-arid areas in china. And there are large amounts of inland lakes which could reflect the climate characters of arid areas and are very sensitive to its environmental change in this region. Lakes in Inner Mongolia have showed a trend of fast fading in recent years. The total area of the lakes have shrank by 1259 km2 from 1987 to2010 and it should be attributed to the climate change and human activities.
The area of bare, droughty and salinization lakeside zones have increased sharply as a result of shrinking and drying of the lakes. After lake basins dried up, they become a steady stream of dust source for the saline-alkaline dust storms disasters which mainly happen in the spring and autumn and impact the eco-environmental security of its downwind regions. At present, the saline-alkaline dust storms become one of the most outstanding eco-environmental problems in Inner Mongolia.
Because of the big winds and the abrasion of wind-drift sand, the dust comes from the dry lake beds of West Juyan Lake has being bringing to the aerosphere, diffusion with airstreams. In this paper, we analyzed the characteristics of soil hardness of the dry lake beds in West Juyan Lake and the occurrence mechanism of saline-alkaline dust storms by combining the google earth images with the field sampling. And we discussed the transport path and its eco-environmental effects on these regions along the way. The results have an important value in revealing the occurrence and influence mechanism of the unique saline-alkaline dust storms.