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南亚次大陆对中国大气传输影响及海螺沟背景站监测的指示效应
The South Asian Subcontinent Impact on Atmospheric Pollutants Transport in China and the Indicating Effect Analysis of Monitoring in Hailuogou Background Station
投稿时间:2016-10-13  修订日期:2016-11-21
DOI:10.19316/j.issn.1002-6002.2018.02.06
中文关键词:  南亚次大陆  中国  传输影响  海螺沟背景站  指示效应
英文关键词:South Asian Subcontinent  China  transmission  Hailuogou background station  indicating effect
基金项目:
作者单位
廖乾邑 四川省环境监测总站, 四川 成都 610000 
张巍 四川省环境监测总站, 四川 成都 610000 
范文武 四川省环境监测总站, 四川 成都 610000 
刘培川 四川省环境监测总站, 四川 成都 610000 
曹攀 四川省环境监测总站, 四川 成都 610000 
杜丽* 中国环境监测总站, 国家环境保护环境监测质量控制重点实验室, 北京 100012 
通讯作者:杜丽*  中国环境监测总站, 国家环境保护环境监测质量控制重点实验室, 北京 100012  
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中文摘要:
      海螺沟背景站地处人烟稀少、远离工业带区域,颗粒物浓度水平与美国背景区域相当,通常情况下各项污染物浓度呈周期性缓慢变化,但通过实时自动监测发现,也有部分时段出现污染物浓度急剧升高的现象,对这种情况进行统计分析,2015年共有43 d因远距离传输导致背景站浓度急剧升高现象,其间PM2.5平均质量浓度为19.4 μg/m3,比其年均质量浓度(8.3 μg/m3)高1倍多。通过对2015年背景站监测数据与年气象分析资料的联合分析,结合HSPLIT 4.8轨迹模式对污染物来源进行溯源,在海螺沟国家大气背景区域的200、3 700 m 2个高度都存在南亚次大陆向中国境内输送的气流路径。后向轨迹200 m高度聚类分析结果:海螺沟背景站PM2.5监测值超"正常"浓度范围时段有84%的大气污染气团主要来自南亚次大陆方向,同时,常规6项其他监测项目的浓度水平也存在协同上升效应。
英文摘要:
      The Hailuogou background station is located in a region sparsely populated and far away from industrial zones. Therefore, the level of particulate matter concentration here is similar to that in background regions of the USA. Usually, concentration of various pollutants changes slowly and periodically, but there are peaks of pollutant concentration during some stages, which are found through real-time automatic monitoring. Statistics about this situation showed that concentration in the background station during 43 days in 2015 rose rapidly due to long-distance transmission. The average concentration of PM2.5 during these days was 19.4 μg/m3, twice as the annual average of concentration (8.3 μg/m3). Through conjoint analysis on data monitored by the background station in 2015 and information in the annual weather analysis, the author tracked pollutants on the basis of models of the HSPLIT 4.8 track. There are paths of airflows through which pollutants are transported from the South Asian Subcontinent to China at the altitude of 200 meters and 3700 meters above the Hailuogou national atmosphere background region. The cluster analysis on the backward trajectory of 200 meters showed that 84% air masses of atmospheric pollution during time periods when the concentration range of PM2.5 monitored by the Hailuogou background station was abnormal come from the direction of the South Asian Subcontinent. Also, there were simultaneous rises in the level of concentration of other items monitored in the regular six programs.
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