區(qū)域傳輸對華東森林及高山背景點位大氣污染物濃度的影響

更新時間：2014-07-16 11:08 來源：環(huán)境科學(xué)報作者: 閱讀：2694

中文摘要

利用HYSPLIT4.8軌跡模式和2011年6月~2012年5月NCEP氣象再分析資料計算每日抵達(dá)華東森林及高山背景區(qū)域的后向氣流軌跡并進(jìn)行聚類，探討該區(qū)域的大氣污染物傳輸特征. 同時結(jié)合國家大氣背景監(jiān)測福建武夷山站同期大氣污染物監(jiān)測數(shù)據(jù)，進(jìn)一步分析不同氣團(tuán)的污染特征及高污染氣團(tuán)的主要來源. 結(jié)果表明，有65%的軌跡輸送污染氣塊，主要來自我國東部高污染負(fù)荷區(qū)、江西省以及西北部沙漠地區(qū)的高空，有35%的海洋性氣團(tuán)對站點污染物起清除作用，且各氣團(tuán)在各季節(jié)對污染物濃度的貢獻(xiàn)有一定差異；SO₂較高濃度主要受北方城市冬季采暖期燃煤影響，CO較高濃度主要受安徽省煤炭生產(chǎn)和消費(fèi)過程中的污染物排放影響，NO_x、 O₃、 PM₁₀和PM_2.5較高濃度主要受我國東部高污染負(fù)荷區(qū)影響.

英文摘要

Transport characteristics of air pollutants transported to the background atmosphere of East China were investigated using HYSPLIT (Hybrid Single Particle Lagrangian Integrated Trajectory) 4.8 model driven by NCEP reanalysis data during June 2011 to May 2012. Based on the air pollutants monitoring data collected at the National atmospheric background monitoring station (Wuyishan station) in Fujian Province, characteristics of different clustered air masses as well as the origins of highly polluted air masses were further examined. The results showed that 65% of all the trajectories, in which air masses mainly passed over highly polluted area of East China, Jiangxi province and upper air in desert areas of Northwest China, carried polluted air to the station, while the rest of trajectories (35%) with air masses originated from ocean could effectively remove air pollutants at the Wuyishan station. However, the impact on the air pollutants for each air mass group varied with seasons. Elevated SO₂ concentrations observed at the background station were mainly influenced by coal burning activities in Northern China during heating season. The high CO concentrations were likely associated with the pollutants emission in the process of coal production and consumption in Anhui province. The elevated NO_x, O₃, PM₁₀ and PM_2.5 concentrations were mostly impacted by East China with high levels of air pollutants.

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