Mixing State and Fractal Dimension of Soot Particles at a Remote Site in the Southeastern Tibetan Plateau
Mixing State and Fractal Dimension of Soot Particles at a Remote Site in the Southeastern Tibetan Plateau
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青藏高原东南部偏远地点烟尘颗粒的混合态和分形维数
DOI：
10.1021/acs.est.9b01917
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发表时间：
2019
影响因子：
11.4
通讯作者：
Li Weijun
中科院分区：
文献类型：
--
作者：
Yuan Qi;Xu Jianzhong;Wang Yuanyuan;Zhang Xinghua;Pang Yuner;Liu Lei;Bi Lei;Kang Shichang;Li Weijun
煤烟颗粒的混合状态和分形维数是影响其吸收能力和气候效应的两个主要因素。在这里，我们调查了这些因素的烟尘颗粒在青藏高原东南部的一个典型的山谷，在当地村庄的木材燃烧的烟尘颗粒的一个主要来源。我们的动机揭示了Df和远程空气中煤烟粒子的老化特性，并讨论了它们的区域气候意义。我们发现，64%的总分析颗粒的数量是烟灰轴承颗粒，其中大部分与硫酸盐或有机涂层老化。Df的大小顺序为裸状烟灰（1.75 ± 0.08）<部分包覆烟灰（1.82 ± 0.05）<嵌入烟灰（1.88 ± 0.05）。老化过程增大了含烟炱颗粒的总体尺寸，并增加了烟炱的致密性。煤烟老化严重依赖于夜间的高相对湿度（RH）。除排放源和涂装工艺外，不同相对湿度下的涂装气溶胶相态是影响烟尘Df的另一个重要因素。
The mixing state and fractal dimension (Df) of soot particles are two major factors affecting their absorption capacity and their climate effects. Here we investigated these factors of soot particles found in a typical valley of the southeastern Tibetan Plateau where wood burning in local villages was one major source of soot particles. Our motivation revealedDfand the aging property of soot particles in remote air and discussed their regional climatic implications. We found that 64% of total analyzed particles by number were soot-bearing particles and most of them aged with sulfate or organic coating. TheDfsequence is bare-like soot (1.75 ± 0.08) < partly coated soot (1.82 ± 0.05) < embedded soot (1.88 ± 0.05). The aging process enlarged the overall size of the soot-bearing particles and increased the compactness of soot. Soot aging critically depended on high relative humidity (RH) during nighttime. Besides emission sources and coating processes, the coating aerosol phase under different RHs is another important factor affecting the sootDf.