| 海陆风对天津市PM2.5和O3质量浓度的影响 |
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| 引用本文： | 孟丽红,李英华,韩素芹,郝天依.海陆风对天津市PM2.5和O3质量浓度的影响[J].环境科学研究,2019,32(3):390-398. |
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| 作者姓名： | 孟丽红 李英华 韩素芹 郝天依 |
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| 作者单位： | 天津市气象科学研究所,天津,300074;天津市环境气象中心,天津,300074 |
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| 基金项目： | 国家自然科学基金项目（No.41771242）；天津市气象局项目（No.201718ybxm12）；天津市自然科学基金项目（No.18JCYBJC23100） |
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| 摘 要： | 静稳天气下局地环流往往会对污染物的传输扩散起重要作用.根据天津市地处渤海西岸，常年受到海陆风影响的特点，综合气象、环境资料及HYSPLIT模型，针对沿海、市区、城郊、山区等代表性站点，研究了海陆风对天津市ρ（PM2.5）和ρ（O3）的影响.结果表明:①2015年天津市海陆风天数为78 d，占全年的22%；海陆风多集中于6-9月，其中，7月海陆风日最多、2月最少.②ρ（PM2.5）和ρ（O3）季节性变化和空间分布特征不同.春、夏两季ρ（PM2.5）山区最高、城郊最低；秋、冬两季ρ（PM2.5）市区最高、山区最低.春、秋两季ρ（O3）沿海最高、市区最低；夏季ρ（O3）山区最高、沿海最低.③海陆风对ρ（PM2.5）有扩散作用，对ρ（O3）有增加作用.海陆风对沿海ρ（PM2.5）扩散作用最为明显，致使冬、秋两季ρ（PM2.5）分别下降20.2%和7.9%；对城郊ρ（O3）增加作用最为明显，致使秋、夏两季ρ（O3）分别升高39.8%和16.2%.④个例研究表明，海风向内陆推进过程中垂直方向最高可达1 000 m，受海风影响天津市ρ（PM2.5）下降，陆风使得ρ（PM2.5）小幅上升，海陆风总体起扩散作用；海陆风使天津市ρ（O3）日变化出现3个峰值，日均值明显增大，其中，城郊增幅（68.2%）最大.研究显示，海陆风对天津市ρ（PM2.5）有扩散的作用，但会增高ρ（O3）.
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| 关 键 词： | 海陆风 PM2.5 O3 |
| 收稿时间： | 2018/4/12 0:00:00 |
| 修稿时间： | 2018/11/8 0:00:00 |
Influence of Sea-Land Breeze on the Concentrations of PM2.5 and O3 in Tianjin City |
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| MENG Lihong,LI Yinghu,HAN Suqin and HAO Tianyi.Influence of Sea-Land Breeze on the Concentrations of PM2.5 and O3 in Tianjin City[J].Research of Environmental Sciences,2019,32(3):390-398. |
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| Authors: | MENG Lihong LI Yinghu HAN Suqin and HAO Tianyi |
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| Affiliation: | 1.Tianjin Institute of Meteorological Science, Tianjin 300074, China2.Tianjin Environmental Meteorological Centre, Tianjin 300074, China |
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| Abstract: | Local atmospheric circulation often plays an important role in the transport and diffusion of pollutants in stable weather. Tianjin City is located on the west coast of the Bohai Sea and is affected by sea-land breeze perennially. The influence of sea-land breeze on PM2.5 and O3 was studied based on the meteorological and environmental data and with the HYSPLIT model. There were 78 days of sea-land breeze in 2015, accounting for 22% of the total days in the year. The maximum and minimum PM2.5 concentrations were observed in the mountain and suburban areas in the spring and summer respectively, and the opposite in the autumn and winter. The maximum and minimum O3 concentrations were observed in the coast and urban areas in spring and autumn respectively, and the opposite in the mountain and coast areas in the summer. The sea breeze affected the diffusion of PM2.5 obviously, which decreased the PM2.5 concentration by 20.2% in winter and 7.9% in autumn, and increased O3 concentration by 39.8% in autumn and 16.2% in summer. The case study showed that the sea breeze expanded to 1000 m in the vertical direction and PM2.5 decreased in Tianjin City. Land breeze increased PM2.5 slightly in the coastal, suburban, urban and mountain areas. Affected by sea-land breeze, the diurnal variation of O3 exhibited three peaks, and the daily average concentration of O3 increased obviously with the highest increase rate of 68.2% in the suburbs. |
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| Keywords: | sea-land breeze PM2 5 O3 |
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