| 冬季一次南支槽活动对川南城市群空气重污染过程影响研究 |
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| 引用本文： | 陈力,王式功,宁贵财,樊晋,连俊标.冬季一次南支槽活动对川南城市群空气重污染过程影响研究[J].气象与环境学报,2021,37(1):9-15. |
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| 作者姓名： | 陈力 王式功 宁贵财 樊晋 连俊标 |
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| 作者单位： | 成都信息工程大学大气科学学院,高原大气与环境四川省重点实验室,四川 成都610225;成都信息工程大学大气科学学院,高原大气与环境四川省重点实验室,四川 成都610225;遵义院士工作中心,气候环境与医疗康养重点实验室,贵州 遵义563000;香港中文大学,环境、能源及可持续发展研究所,香港999077 |
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| 基金项目： | 国家自然科学基金重大研究计划重点支持项目(91644226)和面上项目(41775147);四川省科技计划项目(2018JY0011、2018SZDZX0023);国家重点研发专项(2018YFC0214002)共同资助。 |
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| 摘 要： | 针对四川盆地大气污染防治工作的需要，应用2016年12月26日至2017年1月11日川南城市群（宜宾、自贡、泸州、内江、乐山）大气污染物浓度观测数据和气象数据，采用数理统计和污染天气诊断分析等方法，分析了这次川南城市群跨年度空气重污染过程的污染变化特征及其气象成因。结果表明：南支槽加强并引导其槽前西南干暖气流北上，致使当地低层大气增温，形成低空等温或逆温层，限制当地大气污染物扩散，是助长此重污染过程形成的主要天气系统。川南城市群低空的风向辐合，以及高相对湿度（未形成降水）所产生的吸湿增长效应，与低空等温或逆温配合，促使此次污染物浓度达到峰值（AQI为286）。南支槽减弱，随之原有等温或逆温层被破坏，逐渐减弱消失，低层风向辐合消失，川南城市群上空三维大气扩散能力增强，大气污染物浓度降低，最后降水的湿清除作用使当地污染物浓度快速降低，污染过程结束。本研究发现了有别于四川盆地西北部大气重污染的天气系统和相应气象成因，为深入认识川南城市群大气重污染气象成因及其防控提供了新的重要参考依据。
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| 关 键 词： | 南支槽 川南城市群 重空气污染 逆温 气流交汇辐合 |
| 收稿时间： | 2019-07-24 |
Impact of a south branch trough in winter on heavy pollution process insouthern Sichuan urban agglomeration |
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| CHEN Li,WANG Shi-gong,NING Gui-cai,FAN Jin,LIAN Jun-biao.Impact of a south branch trough in winter on heavy pollution process insouthern Sichuan urban agglomeration[J].Journal of Meteorology and Environment,2021,37(1):9-15. |
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| Authors: | CHEN Li WANG Shi-gong NING Gui-cai FAN Jin LIAN Jun-biao |
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| Institution: | 1. Key Laboratory of Plateau Atmosphere and Environment in Sichuan Province, School of Atmospheric Science, Chengdu University of Information Technology, Chengdu 610225, China2. Zunyi Academician Work Center, Key Laboratory of Climate Environment and Medical Care, Zunyi 563000, China3. Institute of Environment, Energy and Sustainability, the Chinese University of Hong Kong, Hong Kong 999077, China |
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| Abstract: | We analyzed the pollution characteristics and meteorological causes of a heavy air pollution event in the southern Sichuan urban agglomeration(including Yibin,Zigong,Luzhou,Neijiang,and Leshan)from December 26,2016,to January 11,2017,based on the observational data of air pollutants′concentration and meteorological parameters and using methods of statistical analysis and weather diagnosis.The results indicated that the southern branch trough is the major weather system that contributes to the formation of this heavy pollution process.It strengthens and guides the dry,warm southwesterly flows in front of the trough,forming a local low-level isothermal or inversion layer and suppressing the dispersion of local air pollutants.The convergence of wind at low levels,the hygroscopic growth effect due to high relative humidity(without precipitation),and low-level isothermal temperature or temperature inversion,contributes to the peak concentration of air pollutants(AQI=286)in southern Sichuan agglomeration.As the south branch trough weakens,temperature inversion and low-level wind convergence disappear.The dispersion of air pollutants enhances,and air pollutants′concentration decreases.Finally,the wet removal effect of precipitation reduces pollutants′concentration quickly,ending this air pollution event.This study provides new important reference for understanding the meteorological causes of heavy pollution in the southern Sichuan urban agglomeration and its prevention and control,which is different from the causes for air pollution in the northwestern Sichuan Basin. |
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| Keywords: | South branch trough Southern Sichuan urban agglomeration Heavy air pollution Temperature Inversion Airflow convergence |
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