摘要
通过对兰州地区春季大气背景、浮尘、扬沙、沙尘暴天气的大气采样 ,得到了不同天气状况下大气气溶胶的浓度、PM1 0
The influences of dust weather to the urban areas become more serious along with rapid increase of human activities and the intensification of land desertification. More than 10 dust storms occurred in north China in 2000, in which some dust storms occurred from the Hexi Corridor in Gansu Province affected many cities, such as Lanzhou and Beijing. Therefore, more and more scholars research dust weather, however, the research on the physical properties of aerosol is less. In this paper, the atmospheric samples including the atmospheric background, floating dusts, blowing sands and dust storms over Lanzhou region in spring are analyzed, the distribution of the mass concentration of atmospheric aerosol and the PM 10 particles is revealed. The results show that the dust weather occurs frequently over the Lanzhou region in spring, which is related to its geographical location and the meteorological conditions. The average mass concentrations, floating dust, blowing sands and dust storm are 0.486 8 mg/m 3, 1.466 4 mg/m 3, 2.130 5 mg/m 3 and 4.861 5 mg/m 3 respectively. The curves of atmospheric PM 10 granular distribution over the Lanzhou region are bimodal, trimodal and unimodal under floating dusts, blowing dusts and dust storms respectively. The proportions of the fine particles (<2.1μm) occupies 22.6%, 7.2%, 11.4% and 5.7% under the background weather, floating dusts, blowing dusts and dust storms respectively.
出处
《干旱区研究》
CSCD
2004年第2期112-116,共5页
Arid Zone Research
基金
国家重大基础研究发展规划 (G2 0 0 0 0 4870 3 )
国家自然科学基金 ( 4 0 0 75 0 2 5 )
中国科学院 3 0 5项目 (KZCX2 -3 0 5 )资助
关键词
兰州市
春季
沙尘
气溶胶
质量浓度
大气
dust
aerosol
mass concentration
granular distribution
Lanzhou.
