摘要
近年来 ,中国北方的沙尘暴对北京地区的影响越来越受到人们的重视 ,从地质记录上分析研究北京—张家口地区沙尘暴的粉尘来源对确定重点治理区、改善北京地区的大气环境质量具有积极意义。黄土是地质时期沙尘暴形成的风成沉积物 ,其粒径分布蕴含了粉尘搬运过程中的大气环境信息 ,本文利用黄土 -古土壤沉积的粒径分布特征 ,分析了北京—张家口地区和黄土高原地区风成系统的差异 ,并根据粉尘动力学原理 ,结合遥感信息揭示的地面风蚀痕迹 ,探讨了北京—张家口地区黄土粉尘的主要来源 ,指出北京—张家口地区和黄土高原地区分属不同的风成系统 ,有不同的粉尘源区和不同的大气动力条件。北京—张家口地区大气动力强度大 ,粉尘源区近 ,粉尘主要来自阴山以北的内蒙古苏尼特右旗—二连浩特方向 ,与浑善达克沙地关系不大 。
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.
出处
《第四纪研究》
CAS
CSCD
北大核心
2004年第4期430-436,T003,共8页
Quaternary Sciences
基金
国家自然科学基金项目 (批准号 :49894170
40 0 2 42 0 2和 40 0 2 12 0 2 )
国家重点基础研究发展规划项目 (批准号 :G19990 43 40 2 )资助
关键词
风成系统
大气动力强度
黄土粒径分布
风蚀痕迹
dust-transporting wind system, aerodynamic force, grain size distribution, wind-eroded traces
