应用WRF-chem探究气溶胶污染对区域气象要素的影响

Effect of Particle Pollution on Regional Meteorological Factors in China

采用新一代on-line空气质量模式Weather Research Forecasting Model with Chemistry(WRF-chem)模拟探究中国气溶胶污染对4个季节净辐射量、温度、大气边界层高度和降水量等气象要素的影响.模型验证结果表明:WRF-chem可反映出我国四季气象条件和PM_(10)的浓度分布特点.由于气溶胶气候效应作用,受气溶胶污染影响,2006年1、4、7、10月月均净辐射量下降约10 W/m^2,月均温度下降0.15℃,月均PBL高度下降15 m.月均净辐射量、温度、PBL高度显著下降的区域集中在京津冀、长江三角洲、珠江三角洲、山东半岛、武汉及周边、长株潭和成都-重庆等气溶胶浓度较高的地区,秋季下降量最高,春季最低.与其他气象要素不同,气溶胶污染使得降水量有所增加.通过与美洲、欧洲等地区的相关研究对比发现,由于我国气溶胶污染较为严重,气溶胶对气象要素的影响更加显著.

In this paper,the new generation of on-lineair quality model Weather Research Forecasting Model with Chemistry(WRF-chem) was applied to investigate the effect of particle pollution on net radiation,temperature at 2 meter(T_2),the height of atmosphericboundary layer(PBL) and precipitation in January,April,July and October respectively in 2006.The model evaluation result shows that WRF-chem can reflect the characteristics of meteorological factors and the PM_(10) concentration distributions in four seasons.Under the influence of particle's direct,semi-direct and indirect effects,and monthly-mean net radiation decreased-9.12,-8.53,- 10.94 and- 11.23 W/m^2,monthlymean T_2 decreased-0.18,-0.12,-0.17,- 0.221,and monthly-mean height of PBL-16.44,-8.42,-15.48,-22.59 m in January,April,July and October respectively.Obvious decrease occurs in Beijing-Tianjin-Hebei(BTH),Yangtze River Delta(YRD) and Pearl River Delta(PRD)region,Shandong Peninsula,Wuhan and surrounding,Chang-Zhu-Tan and Chengdu-Chongqing regions where the particle concentration is high and the highest decrease occurs in autumn.