%0 Journal Article
%T LACUSTRINE DEPOSIT IN THE ALXA PLATEAU AND THE SAND-DUST STORMIN NORTHERN CHINA<br>阿拉善高原干涸湖床沉积物与华北地区沙尘暴
%A 岳乐平
%A 杨利荣
%A 李智佩
%A 王珉
%A 张维吉
%A 聂浩刚
%A 张睿
%A 武力超
%J 第四纪研究
%D 2004
%I 
%X Juyan Lake is located at the Alxa Plateau, western Inner Mongolia of China. Samples were collected from lacustrine deposits of ancient Juyan Lakes, active sand dune around, surface soil of grassland and ancient abandoned land. By analyzing their grain-size component, materials with different origins on sand-dust composition are discussed. The grain-size measurement indicates that the particles below 10μm account to more than 64% of the surface lacustrine deposits of dried lake-bed, which could be transported thousands of kilometer away in the air under the condition of normal storm. It means that the dust which came from dried lake in this area and other places in northwestern China could sweep over the north of the East Asia under strong wind storm. Sand-dust storm is a mixture of sand storm and dust storm. Sand and dust were carried into the air from the desert, sandy land and sandy grassland when encountered with strong wind. Strong northwest wind prevails over China during winter and spring, it is easy to induce the sand-dust storm and blowing-sand from northwestern China. For the limited blowing height and transporting distance of coarse sand, it deposits in short distance. Fine dust was still transported further fast. New sand and dust may be added when strong wind swept over another sand area. Accordingly, sand-dust storm move forward to southeast step by step. It is considered that sands from sand storms and dust weathers occurred in deserts in northern China and middle and east Mongolia have little affection on North China and East China, because the raising height and moving distance of coarse grain are limited. The material sources of dust weather affecting East Asia come not only from inner continental deserts in western China, but also, and is more important one, from dried lakes, abounded farmlands and exposed sand and gravel grasslands.
%K sand storm
%K dust storm
%K dry lake deposit
%K Juyan Lake
%K the Alxa Plateau<br>沙尘天气
%K 沙尘暴
%K 干涸湖床
%K 居延泽
%K 阿拉善高原
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=EA07051745CDC8D89D5F01A3A4CFE6A9&aid=4C02A2A9E7443311&yid=D0E58B75BFD8E51C&vid=B91E8C6D6FE990DB&iid=38B194292C032A66&sid=A2745AA1110798CA&eid=E3094127AA4ABC1A&journal_id=1001-7410&journal_name=第四纪研究&referenced_num=15&reference_num=22