THE DIFFERENCE BETWEEN DUST-TRANSPORTING WIND SYSTEMS OF BEIJING-ZHANGJIAKOU AREA AND THE LOESS PLATEAU SINCE THE LGM
全新世时期北京-张家口地区与黄土高原地区风成系统的差异

In recent years, the impact of dust storm on Beijing area is paid more attention to. It's helpful for ascertaining the key governing areas and improving the air quality of Beijing to analyze the major dust sources of loess of the Beijing-Zhangjiakou area by studying the loess deposition of this area. The loess is a windblown deposition, grain size distribution of which contains the information of atmospheric dynamics during dust transportation. In this paper, the dust transporting wind system of the Beijing-Zhangjiakou area is compared with that of the loess plateau by studying the grain size distribution of loess and analyzing the wind-eroded traces on the LANDSAT TM remotely sensed images. It was found that dust of Beijing-Zhangjiakou area mainly came along the Sonid Youqi-Erenhot direction in north of Yinshan mountain and the atmospheric dynamic strength in the dust source area of loess of Beijing-Zhangjiakou area was stronger than that of the Loess Plateau.