气象因素对汕头市大气O3污染的影响
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引用本文:杜勤博,吴晓燕,郑素帆,等..气象因素对汕头市大气O3污染的影响[J].气象与环境科学,2019,42(4):83-89.Du Qinbo,Wu Xiaoyan,Zheng Sufan,et al..Effects of Meteorological Factors on Atmospheric O3 Pollution in Shantou[J].Meteorological and Environmental Sciences,2019,42(4):83-89.
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作者单位
杜勤博,吴晓燕,郑素帆,等.  
DOI:doi:10.16765/j.cnki.1673-7148.2019.04.012
基金项目:
中文摘要:利用2014年到2016年汕头市O3的逐日浓度资料,分析了O3污染的时间变化特征,并结合汕头市国家基准气象观测站的同期地面气象资料,分析了风、混合层厚度、降水、大气环流等气象因素对O3污染的影响,同时探讨了影响污染物浓度变化的原因。结果表明:不同于北方多数城市夏季O3污染严重,汕头市的O3污染秋季(911月)最严重,初夏(6月)污染较小,这与汕头的地理位置和气候条件有关。O3浓度呈单峰型日变化,午后15:00左右浓度最高,夜间浓度较低。风速对O3既有扩散作用,又有混合作用,当日均风速为1.7 m/s时O3的平均浓度最大;O3日均浓度与14时混合层厚度呈显著正相关,午后混合层厚度对O3日内峰值有很大影响;O3平均浓度在相对湿度60%时达到最大,高相对湿度不利于O3体积分数的积累;降水对O3的去除效果随着降水量级的增大而增大,汛期降水的去除效果与总体去除效果基本一致,而非汛期强降水(中雨以上)去除效果更加显著;出现轻雾时O3浓度接近平均,出现霾时O3浓度较高,出现大雾时不利于O3的生成;当汕头市地面为冷高压脊、850 hPa为东北风场、500 hPa为副热带高压控制时,有利于光化学反应,易造成O3污染。
中文关键词:O3污染  气象因素  混合层厚度  大气环流
 
Effects of Meteorological Factors on Atmospheric O3 Pollution in Shantou
Abstract:Based on the daily concentration data of O3 in Shantou city from 2014 to 2016, the temporal variation characteristics of O3 pollution was analyzed, and the influence of meteorological factors such as wind, mixed layer thickness, precipitation and atmospheric circulation on O3 pollution was analyzed combined with the surface meteorological data of Shantou national base meteorological observatory during the same period. The results showed that the pollution of O3 in Shantou was the most serious in autumn and less in early summer, which was related to the geographical location and climatic conditions of Shantou, and the daily variation of O3 concentration was single peak, with the highest concentration around 15:00. Wind has both diffusion and mixing effects on O3. When wind speed is 1.7 m/s, the average concentration of ozone is the highest. The daily average concentration of O3 was positively correlated with the thickness of mixed layer at 14:00, and the thickness of mixed layer had a great influence on the peak value of O3 in the afternoon. When the average concentration of O3 reached the maximum at 60% relative humidity, and high relative humidity is not conducive to the accumulation of O3 volume fraction. The greater the precipitation level, the more obvious the O3 removal effect. When haze occurs, the O3 concentration is higher, and when fog occurs, it is not conducive to the formation of O3. When the surface of Shantou city is cold ridge, 850 hPa is northeast wind field and 500 hPa is subtropical high, it is beneficial to photochemistry reaction and easy to cause O3 pollution.
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