福建夏初不同山区背景点气溶胶数浓度特征及潜在源区

doi:10.19741/j.issn.1673-4831.2020.0251

摘要/Abstract

摘要： 随着全球经济的发展，快速城市化使生态环境受到严重威胁，已成为全球的研究热点。以福建为例，利用细颗粒物测量仪Fidas Frog研究福建山区夏初时段不同背景下气溶胶数浓度的污染特征及周边城市化对其的影响，2017年6月分别在福建宁德古田（县城）、南平玉山（清洁地区）和福州七星坪（城市郊区）进行连续观测。结果表明，观测期间不同观测点颗粒物数浓度呈不同特征：古田气溶胶数浓度主要集中在小于400 nm处，气溶胶数浓度平均值为434.37 cm^-3；玉山作为清洁地区，其平均气溶胶数浓度最低，积聚模态（0.18~1.00 μm）和粗粒子模态（>1.00~20.00 μm）颗粒物数浓度相当；七星坪气溶胶平均数浓度最高，其气溶胶数浓度主要集中在小于500 nm处；古田和玉山数浓度粒径谱呈双峰型分布，而七星坪数浓度粒径谱呈单峰型分布。通过对后向轨迹聚类及气溶胶数浓度的潜在源权重分析，得到古田强潜在源区为观测点以南区域，受古田县城人为活动影响较大；玉山和七星坪强潜在源区都在观测点西南区域，七星坪积聚模态气溶胶主要来自厦门、泉州、莆田和福州等沿海城市。

关键词: 气溶胶, 数浓度, 谱分布, 后向轨迹模型(HYSPLIT), 潜在源区

Abstract: With the development of economy globalization, rapid urbanization has led to serious effects on ecological environment, which has become a global research hotspot. To analyze aerosol number concentration under different background in mountainous areas of Fujian and the impact of urbanization, particle samples were collected in Gutian (county) of Ningde, Yushan of Nanping (clean region) and Qixingping of Fuzhou (city suburb) during June 2017 by fine dust measuring device Fidas Frog. Consequently, the results show that there were different characteristics of particle number concentrations at different observation points during the observation period: The size of particles in Gutian was mainly less than 400 nm, and the average particle number concentration was 434.37 cm^-3; The average particle number concentration of Yushan as a clean region was the lowest, and the number concentration of accumulation mode (0.18-1.00 μm) particles were equivalent to coarse mode's (>1.00-20.00 μm). The average particle particle number concentration of Qixingping was the highest, and the dominant size of the particle number concentration at Qixingping was located at less than 500 nm; The particle number concentration of Gutian and Yushan were bimodal distribution, and the number concentration spectrum of Qixingping showed a single peak distribution. Through the backward trajectory clustering and the analysis of potential source weight of aerosol number concentration, it is concluded that the south area of the observation point in Gutian is the potential strong source area which is greatly affected by human activities in Gutian County; Potential source regions were located in the southwest of both Yushan and Qixingping; and the accumulation mode aerosols of Qixingping were mainly from coastal cities such as Xiamen, Quanzhou, Putian and Fuzhou.

Key words: aerosol, number concentration, size distribution, HYSPLIT, potential source region

中图分类号:

段卿, 余永城, 王鑫, 林文. 福建夏初不同山区背景点气溶胶数浓度特征及潜在源区[J]. 生态与农村环境学报, 2021, 37(3): 315-322.

DUAN Qing, YU Yong-cheng, WANG Xin, LIN Wen. Characteristics and Potential Source Regions of Aerosol Number Concentration under Different Environment in Mountainous Areas of Fujian in Early Summer[J]. Journal of Ecology and Rural Environment, 2021, 37(3): 315-322.

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