南京北郊污染物来源及跨区域输送过程研究
投稿时间: 2018-01-13  最后修改时间: 2018-04-10  点此下载全文
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作者单位E-mail
黄乾 南京信息工程大学 huangq@nuist.edu.cn 
基金项目:国家自然科学基金项目(41775096,41575148)
中文摘要:利用全国空气质量指数(AQI)和PM2.5的地面观测数据、全球数据同化系统GDAS数据和FNL再分析气象资料,对2015/2016年冬季南京北郊空气质量变化特征和环境输送条件、污染物源区进行分析,结果表明:以AQI为代表的冬季江淮地区污染程度存在三种典型的污染物跨区域输送路径,西北路径、北方路径和西南路径,西北路径通常发生在蒙古高压较强,且位于平均位置时刻,北郊上空有冷平流,不利于污染物的扩散。北方路径对应蒙古高压弱,东北附近为弱高压控制,偏北气流将污染物带至南京北郊,如跨海洋,则污染减弱。西南路径对应南京北郊为边界层内的反气旋式环流中心,下沉气流十分不利于污染物的扩散。影响南京北郊污染的潜在源区主要分布在河北省南部、山东西部、河南省南部、安徽省东部和湖北省西部。河北省是重要的污染源区,河北省南部和山西东部的污染源通过北方路径将污染物输送至南京北郊,因此北方路径虽发生污染概率少于其他两种,却是形成南京北郊严重污染的重要路径。河南南部污染物通过西北路径输送。安徽和湖北两省则通过西南路径输送。定量分析表明平流输送是南京北郊重度污染的重要原因,近地层风速对AQI的平流对AQI的变化贡献在70%以上,甚至可以达到85%。
中文关键词:AQI  HYSPLIT后向轨迹模式  聚类分析  PSCF  CWT
 
Analysis on air pollutants transport between regions in the northern suburbs of Nanjing
Abstract:Using the ground observation data of the air quality index (AQI) and the PM2.5, the GDAS data of the global data assimilation system and the FNL for the reanalysis data, the characteristics of air quality change, environmental transport conditions and source area of the air quality in the northern suburbs of Nanjing in the winter of 2015/2016 are studied in the paper. The results shows that there are three typical regional transport routes for pollutants: north-west path, north path, and south-west path, represented by AQI in winter. The north-west path usually occurs at strong Mongolia high and the Mongolia high is at the average position. At this time, there is cold air advection over the northern suburbs of Nanjing, which suppresses the diffusion of pollutants. The northern path corresponds to the weak Mongolia high, and a weak high controls the northeast of China. The north wind brings the pollutions to the northern suburbs of Nanjing,and the pollution abates as it passes through the sea. The south-west path corresponds to the anti-cyclone circulation center in the boundary layer of the northern suburbs of Nanjing, which is not conducive to diffuse the air pollutants. The potential source areas are mainly distributed in southern Hebei Province, Western Shandong Province, southern Henan Province, Eastern Anhui province and Western Hubei province. Hebei is an important source of pollution, and the pollution sources in southern Hebei and Eastern Shanxi transport pollutants to the northern suburbs of Nanjing through the north path. Therefore, although the pollution probability of the north path is less than the other two, it is an important path to form serious pollution in the northern suburbs of Nanjing. Transport of pollutants in the southern part of Henan through north-west path. The two provinces of Anhui and Hubei are transported through the south-west path. Quantitative analysis shows that the advection transportation is an important cause of severe pollution in the northern suburbs of Nanjing,and the surface wind contributes more than 70% to the change of AQI by the advection of AQI, and can even reach 85%.
keywords:AQI  HYSPLIT  Cluster technique  PSCF  CWT
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