In this paper the dust emission(PM50) from the surface during 1991-2000 was investigated.
利用美国EPA的起尘公式,本文计算了1991-2000年间中国北方的地面起尘(PM50,粒经小于50μm的颗粒物)分布。
For effectively control blown sand-dust of farmland in Beijing outskirts,repeating fields observation of aerodynamic roughness length and the cases of blowing sand on different land use type were conducted during 2003 and 2004 year.
京郊农用地土壤风蚀而发生的起沙起尘是造成北京市大气环境中、重度污染的重要原因之一。
Distribution of dust emission rates (dtst emission factors) were calculated with two US EPA formulas by inputting pre\|processing Chinese pedological and climatical data.
使用美国环保局 (USEPA)的两个公式计算了中国北方地面起尘速率 (起尘因子 )的分布 ,为此首先对中国土壤学和气候学的有关参数作了相应的处理 。
The emission inventory from the open sources was calculated by Box model(A value),and the contribution of the open sources to atmospheric PM was estimated by chemical mass balance(CMB) model.
利用箱模型(A值法)和空气颗粒物源解析(化学质量平衡法,CMB)模型测算太原市区开放源的年均起尘量及其对环境空气中颗粒物的贡献值。