香港地区一次低能见度事件的数值模拟研究  

NUMERICAL SIMULATION OF A LOW-VISIBILITY EVENT IN HONG KONG

作　　者：蓝静[1,2] 陈柏纬 范绍佳[1] 冯业荣[4] 邓雪娇[5] 樊琦[1] 

机构地区：[1]中山大学大气科学系,广东广州510275 [2]广州市气候与农业气象中心,广东广州511430 [3]香港天文台 [4]广州中心气象台,广东广州510080 [5]中国气象局广州热带海洋气象研究所,广东广州510080

出　　处：《热带气象学报》2013年第6期993-1000,共8页Journal of Tropical Meteorology

基　　金：国家自然科学基金项目(40805043;41175091;40875007);广东省科技计划重点项目(2010A030200012);中山大学青年教师培育项目共同资助

摘　　要：利用MM5/CMAQ模式系统对2009年12月24日出现在香港机场及其周边地区的一次低能见度过程进行数值模拟研究。模式模拟结果与实况资料进行对比的结果表明:MM5气象模式能较好地模拟出此次低能见度过程的流场及相对湿度的变化情况;CMAQ模式能很好地反映出香港机场颗粒物浓度随时间的变化,在颗粒物浓度的空间分布和输送方面模拟效果理想。对此次低能见度过程的特点和形成原因进行分析的结果表明:此次低能见度过程可分两个阶段,前期主要受大雾过程影响,后期是由霾过程中的颗粒物所造成。本次事件的污染物以PM2.5为主,同时NOx浓度超过SO2。A MM5/CMAQ model was utilized to simulate a low-visibility event that occurred in Hong Kong Airport and surrounding areas on December 25, 2009. Comparisons between model simulations and observations showed that the characteristics of the flow fields and the relative humidity could be well captured by the MM5 meteorological model. Besides, the variation tendency, spatial distribution and horizontal transportation of particulate matters simulated by the CMAQ model were almost consistent with the measurements. It was shown that the major pollutants in this event were PM10 and PM2.5, but nitrogen oxide was also important and the concentration of NOn exceeds that of SO2. The low-visibility event could be divided into two stages, one being mainly affected by the fog and the later being a haze process with high concentration of particulate matters.

关 键 词：大气环境学 能见度 大雾 颗粒物 MMS CMAQ 

分 类 号：P427.2[天文地球—大气科学及气象学]