摘要
综合运用了多元资料(环境空气质量监测资料、地面气象观测资料、L波段雷达探空资料、风廓线雷达探空资料和再分析资料)和多种方法(后向轨迹追踪、聚类分析、潜在源区贡献法和数值模拟),研究了武汉地区特殊气象条件对重污染过程的影响,揭示了偏东小风所带来的外源污染物对形成严重污染日的贡献.主要研究结论如下:1)后向轨迹追踪分析表明,武汉地区严重污染日气流主要为来自安徽南部(47. 5%)的偏东小风,模拟结果也显示偏东气流、偏北气流与局地环流共同作用,在武汉地区形成一个局地涡旋,成为反复污染带,加重了武汉地区的污染程度; 2)利用潜在源区贡献法(PSCF)分析发现,武汉市秋冬季的潜在源区主要是安徽、江苏、山东、河南、湖南、江西以及武汉周边地区,因此在冬季大范围污染背景下,跨区域的联防联控(尤其是安徽南部地区)才能有效地减少武汉市秋冬季的重污染日.
Different data （ambient air quality, ground station meteorological observation, L-band radar sounding, wind profile radar sounding, and reanalysis data） and methods （back trajectol-y analysis, cluster analysis, probability source concentration field （PSCF） , and numerical simulation） were used in this study to investigate the effects of meteorological conditions on heavy pollution periods and to reveal the contribution of external pollutants transported by the easterly wind ,which creates severe pollution days in Wuhan, China.The results of the study are as follows. 1 ） The easterly wind containing a high concentration of PM25（ tiny particles or droplets in the air that are two and a half microns or less in width）will pass through the southern part of Anhui.The model results show that the easterly and northerly airflows and local ciresulation play a vere＂y important role in forming a repeated pollution zone in Wuhan.Pollution in Wuhan will be aggravated because of the external pollutants transported by easterly small winds.2） The results of the PSCF method show that the main potential pollutant somse mreas in the autunm-winter season in Wuhan are the Anhui, Jiangsu, Shandong, Henan, Hunan, and Jiangxi provinces, and prefecting-level cities around Wuhan.Therefore, regulating regional transboundary air pollution control （especially in the southern part of Anhui province） in winter is imperative to effectively mitigate urban PM25 loading over Wuhan.The conclusions of this pa- per will contribute to the forecast and early warning service for pollution incidents in Wuhan, and sinmhaneously provide a scientific basis for the government to plan and undertake joint pollution prevention and control decisions.
作者
郑翔
覃军
梁胜文
ZHENG Xiang;QIN Jun;LIANG Shenwen(Environmental School of China University of Geosciences（Wuhan）,Wuhan 430074;Wuhan Environmental Monitoring Center,Wuhan 430015)
出处
《南京信息工程大学学报（自然科学版）》
CAS
2018年第5期536-546,共11页
Journal of Nanjing University of Information Science & Technology（Natural Science Edition）
基金
武汉市2013年重大科技攻关专项"武汉市大气灰霾成因与来源研究"
关键词
偏东小风
秋冬季节
外源污染
重污染过程
PM2.5
easterly wind
autumn-winter season
external pollution
heavy pollution periods
PM2.5
