兰州市供暖期PM10浓度与气象因子分析

为研究兰州市供暖期内PM10浓度变化及其与气象因子的关系，于2007、2008年供暖期在兰州市4个典型城区，用Dust Trak Model 8530采集了303个PM10样品并收集同期3种（风速、相对湿度、气温）气象数据。运用数据统计分析方法，描述了供暖期PM10浓度的月变化和日变化趋势，同时分析了PM10日均浓度与气象因子的相关性。结果表明：（1）兰州市供暖期PM10污染十分严重，2007、2008年PM10的超标率分别为78.5%、54.5%，最大超标倍数分别达到2.27、2.81，PM10浓度日变化呈“双峰双谷”型；（2）PM10日均浓度与风速呈典型的二次函数关系，与相对湿度呈显著的负相关线性关系，而其与气温相关性不显著。

The relationship between PM10 concentration and meteorological factors during the heating period in Lanzhou

In order to understanding the effect of meteorological factors on the mass concentration of the PM10 during the heating period in Lanzhou, we collected 303 PM10 samples with Dust Trak Model 8530 and meteorological data of the corresponding period in 4 typical districts in Lanzhou during heating period in 2007 and 2008. Using the statistical analysis method to analyze the meteorological and PM10 data, and the results indicate that the pollution by PM10 is quite serious. The excess standard rates in 2007, 2008 are 78.5%, 54.5%, respectively. The pollutants observe is as 2.27, 2.81 times as the standards in 2007, 2008. The curve of hourly average PM10 concentration shows 2 peak values and 2 valley values. The daily average concentration of PM10 was negatively correlated with the daily average relative humidity and the relationship of the daily average concentration of PM10 and the daily average wind speed could be stated with a quadratic function. The daily average concentration of PM10 was uncorrelated with the daily mean temperature.