浑善达克沙地沙尘气溶胶的粒谱特征

The Size Distribution of Dust Aerosol Particles in Onqin Daga Sandland

浑善达克沙地是我国主要沙尘气溶胶源地之一 ,但对其沙尘气溶胶特征一直缺乏研究。 2 0 0 1年 4月末到 5月初 ,在内蒙古浑善达克沙地利用PMSFssp 10 0型激光粒谱仪进行了大气气溶胶的外场观测 ,取得了晴天、扬沙和沙尘暴天气条件下沙尘粒子的数浓度采样资料 ,通过统计分析研究 ,总结出浑善达克沙地在不同天气条件下近地面沙尘气溶胶的粒谱分布规律。所得统计结果表明了与其他源地沙尘气溶胶的共同点、差异之处及其原因。这一结果也为沙尘气溶胶辐射气候效应的数值模拟提供了新的实测依据。

Onqin Daga Sandland is one of important sources of dust aerosol in China. But it is very short of observation and research on the size distribution characteristics of dust aerosol from this region up to now. The size distribution of dust aerosol has been measured by PMS Fssp-100 in the Onqin Daga Sandland of the Inner Monoglia Autonomous Region of China between 30 April and 10 May 2001. A lot of data have been collected under different weather conditions such as fine, sand-blowing and sandstorm and so on. The rules of dust aerosol particle size distribution are found through statistical analysis. The results show that the dust size distributions are two-mode logarithm normal in dust storms and one-mode logarithm normal in fine or sand-blowing days. This result is quite useful to simulate radiation forcing and climate effects driven by dust aerosol in climate models.