气象条件对华北地区PM_(2.5)浓度影响的模拟研究

Simulation of Meteorological Conditions on PM_(2.5) Concentration on the North China

利用2008年奥运会期间取得的观测资料,使用RAMS-CMAQ耦合模式设计敏感试验,对相同污染源条件下不同气象场(2007-08和2008-08)对华北地区PM_(2.5)浓度的影响进行了定量分析。分析表明,模式系统可以较为准确地反映区域大气污染物的演变特征,不同气象条件对PM_(2.5)浓度的影响非常明显。2007-08 PM_(2.5)的高值区域主要位于北京地区、河北中南部地区和河南北部地区,而2008-08高值中心区域明显缩小。两种气象条件下差值较大的地区为北京南部、石家庄地区和河北河南交界处,奥运村站2007-08较2008年同期浓度相差达2倍以上。温度、湿度等气象条件的不同引起的污染物的输送和累积是造成PM_(2.5)浓度差异的主要原因。

Using observational data obtained during the 2008 Olympic Games, using the coupled model RAMS-CMAQ sensitivity tests designed for different meteorological conditions under the same sources （ 2007-08 and 2008-08 ） the impact of PM2.5 concentrations in North China were quantitative analysis. Analysis shows that mode the system can more accurately reflect the evolution of the regional characteristics of atmospheric pollutants, the effects of different meteorological conditions on PM2.5 concentration is obvious. 2007-08 PM2.5 high-value areas are mainly located in Beijing, Hebei, Henan, central and southern and northern regions, while the high value of the central region of 2008-08 was significantly reduced. The difference between the two larger areas under weather conditions in southern Beijing, Shijiazhuang and Hebei and Henan junction, the Olympic Village Station 2007-08 compared to the same period in 2008 amounted to more than 2-fold concentration difference. Transport and accumulation of pollutants caused by different temperature, humidity and other weather conditions are the main cause of PMz5 concentration differences.