| 广西北海涠洲岛春季大气颗粒物浓度特征及影响因素 |
| 摘要点击 1932 全文点击 941 投稿时间：2016-09-13 修订日期：2016-12-01 |
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| 中文关键词 粒径分布 数浓度 后向轨迹 聚类分析 涠洲岛 |
| 英文关键词 size distribution number concentration backward trajectory cluster analysis Weizhou Island |
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| 中文摘要 |
| 为了解我国北部湾区域大气环境特征和可能的跨界输送，于2015年3~4月在涠洲岛开展了对大气颗粒物浓度水平和粒径分布特征的外场观测研究，并结合气象因子和后向轨迹探讨了颗粒物浓度变化原因和来源.结果表明涠洲岛大气PM1、PM2.5、PM10质量浓度分别为（21±12）、（35±19）、（43±20）μg·m-3.PM1、PM1~2.5和PM2.5~10质量浓度分别占PM10的50%、32%、18%.0.5~1、1~2.5和2.5~20 μm粒径段颗粒物数浓度分别占总数浓度的93.5%、6.1%和0.4%.颗粒物数浓度与能见度和气压呈弱负相关.后向轨迹模拟分析发现，来自涠洲岛西南方向东南亚一带的气团影响频率最高（45.9%），0.5~1 μm、1~2.5 μm数浓度和PM2.5浓度最低但NO浓度最高；其次为来自正东方向气团（34.1%），SO2浓度最低但O3浓度最高；来自正南方向的气团（12.5%）NO2、NOx、O3和CO浓度最低；来自东北方向的大陆气团影响频率最低（7.4%），但颗粒物数浓度、质量浓度和气体污染物浓度（除O3和NO）最高.涠洲岛大气细颗粒物和气态污染物主要受大陆和东南亚地区输送影响，来自大陆方向的输送以工业污染为主，来自东南亚方向的输送以港口船舶及航运污染为主. |
| 英文摘要 |
| To investigate the characteristics of atmospheric environment and possible cross-boundary transports in the north of South China Sea, field experiments were carried out on Weizhou Island from March to April, 2015. The concentration and particle size distributions of atmospheric particulate matters were measured, and the concentration characteristics and the source of particulate matters were analyzed in combination with meteorological factors and back trajectory analysis. The results showed that:the PM1, PM2.5 and PM10concentrations were (21±12) μg·m-3, (35±19) μg·m-3, (43±20) μg·m-3, respectively. The mass concentrations of PM1, PM1-2.5 and PM2.5-10 accounted for 50%, 32%,18% of PM10 mass concentrations, respectively. Besides, the number concentrations of particulate matters with particle sizes of 0.5-1 μm, 1-2.5 μm and 2.5-20 μm accounted for 93.5%, 6.1% and 0.4% of the total number concentration, respectively. The particle number concentration was negatively correlated with visibility and air pressure. Backward trajectory analysis showed that air masses from southwest direction accounted for the highest frequency effect (45.9%), in this case, particulate matters with particle sizes of 0.5-1 μm, 1-2.5 μm and 2.5 μm had the minimum number concentration and NO had the highest concentration. Air masses from the east direction accounted for 34.1% of the frequency effect with the minimum SO2concentration and the highest O3 concentration. The concentrations of NO2, NOx, O3 and CO were the minimum when air masses came from the south direction which accounted for 12.5% of the frequency effect. Air masses from the northeast had the lowest frequency effect (7.4%), but had the maximum particle number concentration, mass concentration and the concentration of gaseous pollutants except O3 and NO. Atmospheric fine particles and gaseous pollutants on Weizhou island were affected by transport from Chinese mainland and Southeast Asia. Pollutants from Chinese mainland were mainly from industrial sources, while pollutants from Southeast Asia were mainly from the shipping business inside and outside ports. |
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