特别选题
李磊,何钰清,兰紫娟,黎煜满,杨红龙,范绍佳.深圳臭氧污染的环境气象特征分析[J].环境科学学报,2023,43(1):109-118
深圳臭氧污染的环境气象特征分析
- Environmental meteorological characteristics of ozone pollution in Shenzhen
- 基金项目：国家自然科学基金（No.42075059）；广东省科技计划项目（科技创新平台类）（No.2019B121201002）
- 作者
- 单位
- 李磊
- 中山大学大气科学学院，珠海 519082;南方海洋科学与工程广东省实验室（珠海），珠海 519082
- 何钰清
- 中山大学大气科学学院，珠海 519082;广州市环境科学研究院，广州 510620
- 兰紫娟
- 深圳市环境科学研究院，深圳 518001
- 黎煜满
- 中山大学大气科学学院，珠海 519082
- 杨红龙
- 深圳市国家气候观象台，深圳 518040
- 范绍佳
- 中山大学大气科学学院，珠海 519082;南方海洋科学与工程广东省实验室（珠海），珠海 519082
- 摘要：基于2015—2020年深圳污染物浓度监测资料、自动气象站资料以及再分析格点资料，分析了对深圳O3浓度有显著影响的环境气象特征.结果表明：①深圳O3的月均浓度变化规律与其他主要污染物不同，O3月均浓度的峰值出现在10月，恰好是夏季风向冬季风转换的季节.②从地面气象要素来看，深圳O3的浓度与气温及相对湿度的关系最为密切，当气温大于29 ℃的时候，开始出现O3浓度超标的情况，当气温大于32 ℃时O3的浓度和超标率均大幅增加.当相对湿度为40%~55%时，O3浓度超标率以及O3浓度均值达到最高.③后向轨迹统计分析表明，易导致深圳出现O3污染的气流路径主要有3条，分别是东北福建路径、东北江西路径和西北粤西北路径，全部来自偏北的内陆地区.而对深圳O3污染存在影响的潜在源区多位于深圳的东北部和北部.④气流的垂直运动对深圳O3污染有着显著影响.污染日整个深圳上空都存在下沉气流；而非污染日深圳的边界层以上为上升气流.
- Abstract：Based on the observed pollutants concentration data from 2015 to 2020， the data from automatic weather stations and gridded reanalysis data， the characteristics of environmental meteorological conditions that have significant impacts on ozone （O3） concentration in Shenzhen are analyzed. The results show that：① the variation characteristics of the monthly average concentration of O3 in Shenzhen is different from those of the other major pollutants， such as PM2.5 and NO2. The peak value of the monthly average concentration of O3 appears in October， which is the time when the summer monsoon changes to the winter monsoon. ② In terms of ground level meteorological elements， the concentration of O3 in Shenzhen is most closely related to the temperature and relative humidity. When the temperature is greater than 29 ℃， the concentration of O3 begins to rise. When the temperature is greater than 32 ℃， the concentration of O3 and the possibility of exceeding the national standard increase significantly. When the relative humidity is in the range of 40%~55%， the possibility of O3 concentration exceeding the national standard and the average value of O3 concentration reach the highest.③The statistical analysis of backward trajectory shows that there are three main airflow paths to cause O3 pollution in Shenzhen， namely， the northeast Fujian path， the northeast Jiangxi path and the northwest Guangdong northwest path， all from the inland areas. Most of the potential sources of O3 pollution in Shenzhen are located in the northeast and north of Shenzhen. ④ The vertical airflow has a significant impact on O3 pollution in Shenzhen. On the pollution days， there are a downward flow over Shenzhen. On the non-pollution days， there is an updraft flow in the boundary layer of Shenzhen.
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