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气象:2015,41(7):890-898
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上海地区持续东风系统控制下污染扩散条件分析
(1.上海市城市环境气象中心,上海 200135;2.上海市气象与健康重点实验室,上海 200135)
Comparative Analysis of Pollution Diffusion Conditions Under the Control of Sustained Easterly System in Shanghai
(1.Shanghai Urban Environment Meteorological Centre, Shanghai 200135;2.Shanghai Key Laboratory of Meteorology and Health, Shanghai 200135)
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投稿时间:2014-07-03    修订日期:2014-12-25
中文摘要: 利用常规气象资料、物理量场资料、PM2.5小时浓度数据和激光雷达资料,对2014年上半年上海地区持续东风系统控制下两次截然不同的污染变化时空分布特征及其扩散条件进行对比分析。结果表明:海陆温差变化造成两次过程垂直扩散条件显著不同。1月26日海温相对于陆地较高,东风气流为暖平流,海陆热力差异造成近地层垂直温度层结趋于不稳定,加速边界层污染物的垂直扩散;而3月10日过程则相反,海温相对于陆地较低,东风气流为冷平流,造成近地层垂直温度层结趋于稳定,抑制边界层污染物的垂直扩散。此外,激光雷达资料能够直观反映污染物垂直分布,对于了解污染过程的传输特征和形成有一定指导意义。
Abstract:Based on the conventional meteorological data, physical quantity data, hourly PM2.5 concentration data and laser radar data, two distinct temporal and spatial distribution characteristics and diffusion condition of pollution under the control of sustained easterly system in Shanghai are comparatively analyzed. The results show that land sea temperature difference obviously affects the vertical transportation of pollutants. In the 26 January process, the sea surface temperature is higher and easterly flow is warm advection relative to the interior. Land sea thermal contrast makes the vertical temperature stratification in the surface layer tend to 〖JP2〗be unstable and speed up the vertical diffusion of pollutants in the boundary layer. On the contrary, In the 10 March process, the sea temperature is lower and easterly flow is cold advection relative to the interior. Land sea thermal contrast makes the vertical temperature stratification in the surface layer tend to be stable and inhibit the vertical diffusion of pollutants in the boundary layer. In addition, the laser radar data can intuitively reflect the vertical distribution of pollutants and have a certain guiding significance for our understanding of transmission characteristics and formation of pollution process.
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基金项目:中国气象局预报员专项(CMAYBY2014 022)、上海市科研计划项目(14DZ1202904)和中国气象局气候变化专项(CCSF201503)共同资助
引用文本:
毛卓成,马井会,许建明,耿福海,杨丹丹,2015.上海地区持续东风系统控制下污染扩散条件分析[J].气象,41(7):890-898.
MAO Zhuocheng,MA Jinghui,XU Jianming,GENG Fuhai,ANG Dandan,2015.Comparative Analysis of Pollution Diffusion Conditions Under the Control of Sustained Easterly System in Shanghai[J].Meteor Mon,41(7):890-898.