【作者】 高丽娜； 张仁健； 韩志伟； 符淙斌； 颜鹏； 洪盛茂； 焦荔；

【Author】 Gao Lina;Zhang Renjian;Han Zhiwei;Fu Congbin;Yan Peng;Hong Shengmao;Jiao Li;Key Laboratory of Regional Climate-Environment Research for Temperate East Asia,Institute of Atmospheric Physics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Nanjing University;Chinese Academy of Meteorological Sciences,China Meteorological Administration;Environmental Monitoring Center Station of Hangzhou City;

【机构】 中国科学院大气物理研究所东亚区域气候-环境重点实验室； 中国科学院大学； 南京大学气候与全球变化研究院； 中国气象科学研究院； 杭州市环境监测中心站；

【摘要】 本文利用MM5-CMAQ模式系统,对2011年冬季长江三角洲区域的一个污染过程进行了模拟,并以杭州为例结合CMAQ过程分析技术,对污染成因进行分析。结果表明模式系统对气象场和气态污染物的模拟与观测结果较为一致。长江三角洲地区,在NO_x排放源的影响下上海和杭州的NO₂浓度较高,而江苏北部和西南部平均NO₂浓度大多超过20ppb,反映出气象条件的影响。NO₂的高值区对应着O₃的低值区,杭州西南部,安徽、浙江和江西省交界处O₃浓度较高,达40ppb以上。上海及江苏西北部的SO₂浓度较高,中心超过50ppb,杭州SO₂浓度也较高,与上述区域的SO₂排放源有关。对杭州的过程分析结果表明,化学反应过程和排放源使NO₂浓度上升,而扩散和平流过程则使NO₂浓度下降,当边界层高度降低风速减小,气象条件不利于扩散时,由排放源和化学过程生成的NO₂逐渐累积。O₃主要来自于扩散和平流过程,而近地层O₃主要被化学反应过程消耗,干沉降对O₃也有一定的清除作用。一次排放和平流过程是SO₂的主要贡献者,扩散和干沉降过程使SO₂浓度降低,SO₂除了受本地一次排放源的影响,还受上风方SO₂影响。更多还原

【Abstract】 A NO₂ O₃ and SO₂ pollution episode over the Yangtze River Delta Region（YRDR） during 8 to 16 December 2011 was simulated using the Models-3 Community Multiscale Air Quality（CAMQ）.An overall satisfactory performance was obtained between the modeled and measured hourly meteorological and chemical variables.Shanghai City and Hangzhou city where local NO_x emission sources are strong are high temporal mean NO₂ concentration regions over the YRDR.Under certain meteorological conditions,temporal mean NO₂ concentrations are more than 20 parts per billion volumes（ppb） over the north and southeast of Jiangsu province where the NO_x emissions sources are relatively weaker.The higher NO₂ regions correspond to the lower O₃ regions over the YRDR.Ozone concentration is highest（greater than 40 ppb） at the southeast of Hangzhou and the junction area of 3 provinces Anhui Zhejiang and Jiangxi.The northeast of Jiangsu province,Shanghai city and Hangzhou city are high SO₂ concentration regions with the maximum value greater than 50 ppb.In the mean time SO₂ emission sources are stronger at those regions.The CMAQ subsequent process analysis tool was also used to investigate the formation process of pollutants at Hangzhou city.It turns out that chemical reaction and emission process are the major contributors to NO₂ production.Diffusion and advection process contribute to NO₂ loss.NO₂ from chemical and emission process accumulated under weak diffusion conditions with lower planetary boundary layer height and wind speed.Diffusion and advection process contribute to O₃ production.And O₃ are consumed by chemical reactions and removed by dry depositions on ground.Primary emissions and advection process make main contribution to SO₂ concentration.And diffusion and deposition process contribute to SO₂ loss.The SO₂ concentration is under the affection of not only local emission but also SO₂ transported form upwind direction.更多还原