Sub-Mode Aerosol Volume Size Distribution and Complex Refractive Index from the Three-Year Ground-Based Measurements in Chengdu China

Sub-Mode Aerosol Volume Size Distribution and Complex Refractive Index from the Three-Year Ground-Based Measurements in Chengdu China
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中国成都三年地基测量的子模式气溶胶体积粒径分布和复折射率

DOI:
10.3390/atmos10020046
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发表时间:
2019-01
期刊:
影响因子:
2.9
通讯作者:
Zhang Yang
Zhang Yang
中科院分区:
地球科学4区
文献类型:
--
作者:
Zhang Chi;Zhang Ying;Li Zhengqiang;Wang Yongqian;Xu Hua;Li Kaitao;Li Donghui;Xie Yisong;Zhang Yang

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成都市是我国西南地区典型的盆地型城市,遥感观测资料很少。为了评估气候变化和建立区域气溶胶模式,需要对分离体积粒径分布(VSD)和复折射率(CRI)有更深入的了解。本文利用成都地区近三年的观测资料,采用VSD和CRI的子模态,研究了成都地区VSD和CRI的子模态特征及其气候效应。精细模式气溶胶光学厚度(AODf)的年平均比例为92%,与总气溶胶光学厚度的月变化趋势相同。但不同月份的气溶胶光学厚度(AODc)变化不大。成都地区室间隔缺损有4种鉴别模式,其中位半径分别为0.17 μm ± 0.05,0.31 μm ± 0.12,1.62 μm ± 0.45,3.25 μm ± 0.99。多年的平均值和季节变化的精细和粗糙模式VSD和CRI也进行了分析,以表征该地区的气溶胶。细模单次散射散射率(SSAs)高于粗模单次散射率,说明成都地区粗模气溶胶对太阳光的吸收作用强于小尺度气溶胶。
Chengdu is a typical basin city of Southwest China with rare observations of remote sensing measurements. To assess the climate change and establish a region aerosol model, a deeper understanding of the separated volume size distribution (VSD) and complex refractive index (CRI) is required. In this study, we employed the sub-mode VSD and CRI in Chengdu based on the three years observation data to investigate the sub-mode characteristics and climate effects. The annual average fraction of the fine-mode aerosol optical depth (AODf) is 92%, which has the same monthly tendency as the total AOD. But the coarse-mode aerosol optical depth (AODc) has little variation in different months. There are four distinguishing modes of VSD in Chengdu; the median radii are 0.17 μm ± 0.05, 0.31 μm ± 0.12, 1.62 μm ± 0.45, 3.25 μm ± 0.99, respectively. The multi-year average and seasonal variations of fine- and coarse-mode VSD and CRI are also analyzed to characterize aerosols over this region. The fine-mode single scattering albedos (SSAs) are higher than the coarse-mode ones, which suggests that the coarse-mode aerosols have a stronger absorbing effect on solar light than the small-size aerosol particles in Chengdu.
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