广西北海涠洲岛春季大气颗粒物浓度特征及影响因素

发布时间：2018-03-22 11:37

本文选题：粒径分布　切入点：数浓度　出处：《环境科学》2017年05期 　论文类型：期刊论文

【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PM_1、PM_(2.5)、PM_(10)质量浓度分别为(21±12)、(35±19)、(43±20)μg·m~(-3).PM1、PM_(1~2.5)和PM_(2.5~10)质量浓度分别占PM10的50%、32%、18%.0.5~1、1~2.5和2.5~20μm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%),0.5~1μm、1~2.5μm数浓度和PM_(2.5)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.
[Abstract]:In order to understand the characteristics of atmospheric environment and possible transboundary transport in Beibu Gulf of China, a field observation study on the concentration level and particle size distribution of atmospheric particulates was carried out in Weizhou Island from March to April 2015. Combined with meteorological factors and backward trajectory, the causes and sources of particulate concentration variation are discussed. The results show that the mass concentrations of PM1M-1 / PM1 / PM1 / PM1 / (10) in Weizhou Island are 21 卤12 / 10 (35 卤19 / 20) 渭 g / m ~ (-35 卤20) 渭 g / m ~ (-35 卤20) 渭 g / 渭 g / m respectively, respectively, and the mass concentrations of PM1 / PM1 / PM1 / PM1 / P ~ (1 / 10) / PM10 account for 50 ~ 32 ~ 18.0.51 ~ (2. 5) and 2.520 渭 m of PM10, respectively. The number of particles was negatively correlated with visibility and atmospheric pressure. The influence frequency of air mass from southwest of Weizhou Island in Southeast Asia is the highest (45.9%). The concentration of air mass is the lowest, but the concentration of no is the highest, the concentration of so _ 2 is the lowest but the concentration of O _ 3 is the highest, and the concentration of so _ 2 is the lowest but the concentration of O _ 3 is the highest, and the concentration of no is the highest, and the concentration of so _ 2 is the lowest and the concentration of O _ 3 is the highest. The concentration of no _ 2, O _ xO _ 3 and CO was the lowest in the air mass from the south to the south, and the influence frequency of the continental air mass from the northeast direction was the lowest (7.4%), but the concentration of particles was the lowest. The mass concentration and the concentration of gas pollutants (except O 3 and no) were the highest. The atmospheric fine particles and gaseous pollutants in Weizhou Island were mainly affected by the transport in the mainland and Southeast Asia, and industrial pollution was the main source of transport in the continental direction. Transport from Southeast Asia to port ships and shipping pollution.
【作者单位】：山西大学环境科学研究所;中国环境科学研究院环境基准与风险评估国家重点实验室;南京大学大气科学学院;广西壮族自治区环境保护科学研究院;
【基金】：环境保护公益性行业科研专项(201309016) 国家自然科学基金项目(41205093) 山西省第六批海外百人计划项目山西省回国留学人员科研项目(2013-012) 广西自然科学基金项目(2015GXNSFBA139203)
【分类号】：X513

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