摘要
对１９８６～１９９６年以来，发生在我国西北地区的１２次较大沙尘暴个例，首次结合大气自然降尘背景值的监测结果，研究了沙尘暴降尘在甘肃境内的沉降范围和分布状况，给出了沙尘暴降尘在这一区域内的沉降量。同时还讨论了沙尘暴降尘在甘肃的分布和黄土堆积问题。沙尘暴降尘在甘肃的分布是以河西走廊东部为中心，并向大气环流下游地域扩散，形成一个自西北向东南迅速递减的梯度分布状态。１１年间发生的较大沙尘暴，在甘肃境内共降尘３７５８．３７×１０４ｔ。
The studing results to 12 times of sand dust storms taking place in North China during 1986￣1996 as well as the natural dust background values have given out the distributing situation of sand dust deposition in Gansu region. The distribution of sand dust in the studied area concentrated at the eastern part of Hexi Corridor and extended its range through atmospheric circulation, which has formed a gradient distributing state decreasing rapidly toward Southeast from Northwest. The total amount of sand dust deposition on Gansu territory from those relatively great storms within 11 years was estimated at 3 758 37×10 4 t. In the paper, the relation of sand dust deposition with loess deposit has been discussed also.
出处
《中国沙漠》
CSCD
北大核心
1998年第1期32-37,共6页
Journal of Desert Research
关键词
甘肃
沙尘暴降尘
分布
沉降量
Gansu\ Sand dust storm deposition Distribution The Quantity of deposition
