珠江三角洲一次典型复合型污染过程的模拟研究

中国环境科学 2012,32(2):193~199 China Environmental Science

珠江三角洲一次典型复合型污染过程的模拟研究

邓 涛1*,吴 兑1,邓雪娇1,谭浩波1,李 菲1,郑君瑜2,廖碧婷1 (1.中国气象局广州热带海洋气象研究所,

广东 广州 510080;2.华南理工大学环境科学与工程学院,广东 广州 510006)

摘要:利用空气质量模式系统(MM5-CAMQ-SMOKE),模拟珠江三角洲一次典型的复合型污染过程,研究O3、NOx及能见度等的时空变化,分析各种气溶胶的质量比例以及对消光的贡献.从模拟结果来看,模式系统能很好的模拟此次过程中光化学烟雾标识物的时空分布,以及灰霾的发生、减弱再到进一步加剧的过程.PM2.5占PM10的质量浓度份额平均为79.8%.爱根核和积聚核的数浓度比巨核数浓度平均高3~4个数量级.在气溶胶质量权重中,硫酸盐所占的比重最高,占PM2.5权重达到31%,元素碳为21%,有机碳为14%,铵盐为7.2%,硝酸盐为2%.在平均相对湿度下,二次气溶胶对消光的贡献超过50%,而在高相对湿度的情况下,二次气溶胶对消光的贡献超过70%.可见此次珠江三角洲地区能见度恶化主要是由各种化学过程生成的细粒子引起. 关键词:复合型污染;CMAQ;光化学烟雾;灰霾;能见度

中图分类号:X513 文献标识码:A 文章编号:1000-6923(2012)02-0193-07

Simulation of a typical complex pollution process over Pearl River Delta area. DENG Tao1*, WU Dui1, DENG Xue-jiao1, TAN Hao-bo1, LI Fei1, ZHENG Jun-yu2, LIAO Bi-ting1 (1.Institute of Tropical and Marine Meteorology, Guangzhou, China Meteorological Administration, Guangzhou 510080, China;2.College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China). China Environmental Science, 2012,32(2):193~199

Abstract:This paper investigated the temporal and spatial variation of O3, NOx and visibility, and further analyzed the share of mass and the extinction contribution of each aerosol species, based on the simulation of a typical complex pollution process over Pearl River Delta area through the air quality modeling system (MM5-CAMQ-SMOKE).The spatial and temporal distribution of photochemical smog markers, as well as processes of haze initiating, weakening, and intensifying, could be well simulated by this modeling system. The PM2.5 contributed 79.8% of the PM10 mass concentration. The number concentration of nuclei of aitken mode and accumulation mode was higher than that of the coarse mode on the order of 103~104. Of all the aerosol masses, the sulfate contributed the highest fraction (31%) of the PM2.5 concentration, while black carbon, organic carbon, ammonium, and nitrate contributed 21%, 14%, 7.2% and 2%, respectively. The extinction contribution of secondary aerosol was more than 50% under averaged relative humidity condition, and more than 70% under high relative humidity condition. Therefore, visibility deterioration in this case was mainly caused by fine particles generated during various chemical processes over the Pearl River Delta region. Key words:complex pollution;CAMQ;photochemical smog;haze;visibility

近年来,城市群大气复合型污染日益严重.复唐孝炎等[511]率先开展了中国多个地方光化学合型大气污染是指大气中由多种来源的多种污烟雾的特征研究,光化学反应可以产生的大量二 染物在一定的大气条件下(如温度、湿度、阳光

等)发生多种界面间的相互作用、彼此耦合构成收稿日期:2011-05-08

基金项目:国家“973”项目(2011CB403403);国家自然科学基金资

的复杂大气污染体系[1],表现为大气氧化性物种

助项目(U0733004);广东省2006年环保专项基金(2006354);广东省

和细颗粒物浓度增高、大气能见度显著下降和环自然科学基金资助项目(10151008019000004);广东省科技计划项目境恶化趋势向整个区域蔓延.珠江三角洲城市群(2010A030200011);广东省气象局气象科技项目(2008B07)

-,[24].* 责任作者, 助理研究员, tdeng@http://www.mianfeiwendang.com

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