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2015年10月南京霾污染过程分析
康娜,胡康,Kanike Raghavendra Kumar,曹晓云,邓发荣,等
作者单位E-mail
康娜 南京信息工程大学气象灾害教育部重点实验室 nameir@126.com 
胡康 南京信息工程大学气象灾害教育部重点实验室  
Kanike Raghavendra Kumar 南京信息工程大学气象灾害教育部重点实验室  
曹晓云 南京信息工程大学气象灾害教育部重点实验室  
邓发荣 南京信息工程大学气象灾害教育部重点实验室  
摘要:
为探讨南京秋季霾污染过程发生的主要影响因素,利用南京信息工程大学太阳光度计观测霾污染发生天气下AOD(Aerosol optical depth,气溶胶光学厚度)数据,计算AE440-1020(Angstrom Exponent,波长指数)以及a2(光谱曲率),结合MODIS(Moderate resolution Imaging Spectroradiometer)火点数据以及CALIPSO(Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations)卫星气溶胶组分分析,对2015年10月南京霾污染过程进行分析,结果表明:该月出现两次霾污染过程,期间较为严重的霾污染天气下,南京地区AE440-1020均高于1.0并且a2呈负值,其中16日AQI达峰值201,AOD500达1.51,AE440-1020达1.37,a2达-0.77;这两次较为严重霾污染过程均主要由人为因素(工业污染、城市建设、生物质燃烧、汽车尾气排放等)产生的细粒子造成。后向轨迹分析发现,2015年10月16日南京地区霾污染天气发生的主要原因是区域型污染,同时受长距离输送影响,大量携带人为因素产生的细粒子以及少量沙尘等污染物的空气团途经内蒙古、山东等地到达南京,加剧了当日的污染程度;2015年10月23日南京地区霾污染天气的发生则主要受长距离输送影响,同时也受到区域型污染影响。研究显示,稳定的气象条件下,较高的相对湿度,较低的地表风速,低混合层高度,以及贴地逆温的出现是诱发霾污染天气产生的有利气象条件。
关键词:  太阳光度计  AOD  AE    气象条件
DOI:
分类号:X513
基金项目:江苏省自然科学基金青年基金(BK20140996);中国气象局气溶胶与云降水重点开放实验室开放课题(KDW1404);江苏高校优势学科建设工程资助项目(PAPD)
Analysis of haze weather process in Nanjing during October 2015
Kang Na,Hu Kang,Kanike Raghavendra Kumar,Cao Xiao-yun,Deng Fa-rong,et al
Abstract:
The AOD (Aerosol optical depth) values observed at Nanjing University of Information Science and Technology (NUIST), Nanjing from the Sun photometer are used to calculate the AE440-1020 (?ngstr?m exponent) and the a2 (spectral curvature). The aim of this study is to investigate the impact of aerosols produced from severe haze process on local meteorology over Nanjing during the autumn season (in October) of 2015. The AOD500 and AE440-1020 values were observed to be > 1.0, while negative values of a2 (indicate dominance of fine-mode aerosols) were found most of the days, with high values particularly on heavy haze pollution day (i.e., on 16th). The results showed that extreme values of AQI (201), AOD500 (1.51), AE440-1020 (1.37) and a2 (-0.77) were found on 16th October. Further, the analysis of aerosol subtypes obtained from the MODIS (Moderate resolution Imaging Spectroradiometer) fire products as well as CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations) revealed a clear indication of dominance of fine-mode particles resulting from anthropogenic activities such as industrial and construction activities, biomass burning, and automobile transportations. The HYSPLIT (Hybrid Single Particle Lagrangian Integrated Trajectory) model derived back trajectories on 16th October revealed that the pollutants are mainly originated from local sources, apart from the long-range transported dust (at higher altitudes) from Inner Mongolia and Shandong provinces before arriving at Nanjing, which are responsible for the outbreak of high pollution and column loading. While the trajectories retrieved on 23rd October, 2015 obviously showed that the air masses reaching at Nanjing are mainly of long-range transported pollutants in addition to the local sources. Further, it is examined that the stagnant synoptic meteorological conditions were characterized by high relative humidity, low wind speed, and low mixed layer depth are likely contributed to increased environmental pollution over the region.
Key words:  Sun photometer  AOD  AE  haze  meteorology