北京粉尘沉降物的物理化学特征及其物源初探

对北京上空不同高度不同时间段采集的粉尘样品的物理化学特征进行了研究。认为不同的风动力作用导致北京上空粉尘不同来源的物质高度混合,且高度越高远源物质越多,高度越低近源物质越多。由于物质来源不同,粉尘的物理化学特征呈现出不同的特点。通过研究发现,Si/Al比值能近似地反映粉尘在空中的分布特征,可以作为粉尘扬起高度的间接指标。

Preliminary study on source area and physical and chemical characteristics for aeoliandust deposits in Beijing, China

The intention of this paper is to survey dust in atmosphere of Beijing City. The purpose of this research is figuring out the relation of the dust and soil around Beijing. The dust samples of different height at 325m Meteorological Tower of Institute of Atmospheric Physics (IAP) were collected in two time period (2007.6.7-2007.11.6 and 2007.11.6-2008.6.12). The characters of physical and chemical analysis indicated that the primary factor of influence dust is wind power which has perfectly mixed the matter of local place and far off place. The matters of far off place are much more than local place with height increasing. It has a linear relation between ratio of Si/Al and heigth of dust sample. From the relation, we can imprecisely figure out the approximate heigth of the equal proportion mix matter in local place and far off place.