青藏高原北部大陆气溶胶本底值特征的初步观测研究

THE OBSERVATION AND RESEARCH FOR THE CONTINENTAL AEROSOL BACKGROUND CHARACTERISTICS IN THE NORTHERN PART OF THE QINGHAI-XIZANG PLATEAU

本文分析了１９８９年８月青藏高原五道梁地区大气气溶胶粒度谱、元素组成及其分级特征的观测资料。指出五道梁地区气溶胶粒度谱曲线在０.３５—０.５５μｍ区间存在着一个因次生细粒子数急剧减少而形成的“过渡峰”。该峰是边远地区大陆本底态气溶胶粒度谱曲线特有的标识峰。文中报导了五道梁地区２个不同功能点上１９种气溶胶组成元素的浓度值及其分级分布数据，其中Ｓ为１１２.２ｎｇ／ｍ３，Ｐｂ为１０.３ｎｇ／ｍ３。浓度值很低，可与格陵兰、北极等偏远地区相比较。元素的分级图谱分别为双模态、准均匀态和单模态分布，与组成五道梁气溶胶的风沙尘、传输尘和局地污染尘三个发生源相一致。

It has been studied that the observation data of aerosol size distribution,elemental composition and different size stage characteristics which were sampled at Wudaoliang of the Qinghai-Xizang Plateau,in August 1989. The results point out that there is a “transitional peak” which is caused by the second fine particles number suddenly reduces and the peak lies in the 0 35 0 55 μm region in the aerosol size distribution curve. The special transitional peak maybe is the characteristic peak for the continental background aerosol size distribution curve. In this paper,it has been reported also that concentrations of 19 elements of aerosol composition and different size stage distribution data, which was measured at 2 different function sites of Wudaoliang, Qinghai Province. Where,S is 112 2 ng/m 3 ,Pb is 10 3 ng/m 3 ,respectively. The values are very lower and can compare with the value were measured at remote area such as Greenland Island and Arctic, etc..The elements different size stage distribution curve show as double model, quasi-smooth model and single model,and they represent the 3 aerosol sources at Wudaoliang: wind and sand dust,transportation dust and local pollution dust, respectively.