| 武当山夏季颗粒物数浓度谱分布特征及气团来源影响研究 |
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| 引用本文： | 赵丽娜,徐义生,任丽红,李刚,岳长涛,王莹,刘刚.武当山夏季颗粒物数浓度谱分布特征及气团来源影响研究[J].环境科学研究,2020,33(9):2020-2029. |
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| 作者姓名： | 赵丽娜 徐义生 任丽红 李刚 岳长涛 王莹 刘刚 |
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| 作者单位： | 1.中国石油大学(北京)理学院, 北京 102249 |
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| 基金项目： | 国家自然科学基金项目（No.41705136）；中国环境科学研究院中央级公益性科研院所基本科研业务专项（No.JY41375133）；国家重点研发计划项目（No.2016YFC0206001） |
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| 摘 要： | 为研究大气边界层中上层大气颗粒物的数浓度谱分布特征及气团来源的影响，于2018年6月利用3080型SMPS粒径谱仪对武当山14.6~660 nm颗粒物数浓度谱进行观测，分析和探讨了其数浓度谱分布及日变化特征，并结合后向轨迹、潜在源贡献因子法（PSCF）与浓度权重轨迹分析法（CWT）探讨对武当山颗粒物数浓度影响较大的外源输送路径和贡献源区.结果表明:①武当山大气颗粒物主要以爱根模态为主，平均数浓度为2 500个/cm3，积聚模态、核膜态平均数浓度分别为2 265、359个/cm3，3种模态数浓度分别占总数浓度的48.79%、44.21%、7.01%.②在新粒子生成日，核膜态数浓度于10:00开始上升，11:00—17:00的核膜态数浓度相对较高，约2 000个/cm3.新粒子生成日ρ（SO2）与ρ（O3）的日变化趋势均与核模态数浓度较为相似，表明SO2和O3参与光化学反应后的产物（硫酸及有机物）有利于新粒子的生成与增长.新粒子生成日风速、温度均大于非新粒子生成日，但相对湿度较低.③在东部及局地气团影响下大气颗粒物主要以积聚模态为主，数浓度分别为2 311和2 596个/cm3；核模态、爱根模态数浓度在受西北气团影响时最大，数浓度分别为806和3 078个/cm3.④潜在源区分析表明，影响武当山积聚模态数浓度的主要源区为十堰市本地及襄阳市，二者贡献值在840个/cm3以上.研究显示，武当山颗粒物主要以爱根模态为主，颗粒物数浓度日变化主要受大气边界层发展及山谷风的影响，较高的ρ（SO2）与ρ（O3）以及高温、低湿及较大的风速均有利于新粒子的生成，周边城市的区域性传输对武当山颗粒物的影响较大.
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| 关 键 词： | 颗粒物 数浓度 后向轨迹 潜在源分析 武当山 |
| 收稿时间： | 2019/5/21 0:00:00 |
| 修稿时间： | 2020/3/20 0:00:00 |
Particle Size Distribution and Air Mass Transportation Pathways at Mountain Wudang in Summer |
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| ZHAO Lina,XU Yisheng,REN Lihong,LI Gang,YUE Changtao,WANG Ying,LIU Gang.Particle Size Distribution and Air Mass Transportation Pathways at Mountain Wudang in Summer[J].Research of Environmental Sciences,2020,33(9):2020-2029. |
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| Authors: | ZHAO Lina XU Yisheng REN Lihong LI Gang YUE Changtao WANG Ying LIU Gang |
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| Affiliation: | 1.College of Science, China University of Petroleum(Beijing), Beijing 102249, China2.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China3.Ecological Environment Bureau of Shiyan City, Shiyan 442000, China4.Shiyan City Environmental Monitoring Station, Shiyan 442000, China |
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| Abstract: | In order to study the particle size distribution in the middle and upper part of the atmospheric boundary layer and the relationships with air mass transport pathways, the particle size distributions in a diameter range of 14.6-660 nm were measured using a scanning mobility particle sizer (SMPS-3080) at Mountain Wudang in June 2018. The size distributions and diurnal variations of number concentrations were analyzed. PSCF and CWT were used to explore the exogenous transport pathways and potential sources of number concentrations at Mountain Wudang. The results showed that: (1) The particle concentrations ranked in the order of Aitken mode (2500 cm-3, 48.79%) > accumulation mode (2265 cm-3, 44.21%) > nucleation mode (359 cm-3, 7.01%). (2) On new particle formation (NPF) days, the number concentration of nucleation mode began to rise at 10:00 and remain a relatively high level of about 2000 cm-3 from 11:00 to 17:00. The daily variation trend of ρ(SO2) and ρ(O3) on NPF days was similar to the nucleation mode, indicating that the sulfuric acid formed by photochemical reactions of SO2 and organic matter produced by VOCs and O3 participated in the formation and growth progress of new particles. The wind speed and temperature were higher on NPF days than those on non-NPF days, while the relative humidity was lower on NPF days. (3) The aerosol observed under the influence of the eastern and local air masses was dominated by accumulation mode with number concentration of 2311 and 2596 cm-3. The number concentrations in nucleation mode and Aitken mode were the highest under the effect of the northwest air mass and their concentrations were 806 and 3078 cm-3, respectively. (4) The potential source analysis indicated the major source areas were Shiyan City and Xiangyang City and the value was above 840 cm-3. The study showed that the particles of Mountain Wudang were mainly dominated by the Aitken mode, and the diurnal variation of the particle number concentration was mainly affected by the development of atmospheric boundary layer and the mountain-valley breeze. Higher concentrations of SO2 and O3, high temperature, low humidity and higher wind speed were conducive to the formation of new particles, and the regional transmission from surrounding cities had a great impact on Mountain Wudang. |
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| Keywords: | particulate matter number concentration backward trajectory potential source analysis Mountain Wudang |
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