摘要
从多年降尘实测资料入手，分析了粉尘粒度特征、沉积速率和时变过程。提出了气象要素相关估测模型．确定０．２５ｍｍ为本区粉尘沉积粒径上限。周围沙漠是粉尘沉积细砂部分的尘源，粉砂和粘土部分沉积来自一个较大的时空范围，二者几乎各占降尘量的１／２。研究区年平均粉尘沉积速率４３５８ｋｇ／ｈｍ２，每年５月的季风转期具有年内最大沉积速率。
Dustfall is a important process of weather in the arid zone. However, studies of dustfall can not meet development of environment sciences because of absence of long-term observation in the world. This paper analysed time-space changes of dustfall and brought forward two prediction models. Annual mean dustfall is 4 358 kg/hm 2, of which dustfall makes up 79.32% in Spring and Summer. In a year the highest dustfall comes forth in May and June which is the transitional period of the season wind in eastern Asia. Particles between 0.07￣0.5 mm make up 49.43% of total dustfall and come from near deserts; particles below 0.07 mm count for 50.57% and from a intercontinental scale.
出处
《中国沙漠》
CSCD
北大核心
1997年第2期127-132,共6页
Journal of Desert Research
基金
中国科学院沙坡头试验研究站基金
关键词
沙漠
降尘粒度
沉积速率
腾格里沙漠
尘源
Dustfall particle-size Sediment rate Dust sources Prediction models
