Mixing State and Fractal Dimension of Soot Particles at a Remote Site in the Southeastern Tibetan Plateau

IF 10.8 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

环境科学与技术 Pub Date : 2019-06-18 DOI:10.1021/acs.est.9b01917

Qi Yuan, Jianzhong Xu, Yuanyuan Wang, Xinghua Zhang, Yuner Pang, Lei Liu, Lei Bi, Shichang Kang, Weijun Li*

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引用次数: 49

Abstract

The mixing state and fractal dimension (D_f) 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 revealed D_f and 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. The D_f sequence 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 soot D_f.

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青藏高原东南部偏远地区煤烟颗粒混合状态及分形维数

烟灰颗粒的混合状态和分形维数(Df)是影响其吸收能力和气候效应的两个主要因素。本文以青藏高原东南部一个典型山谷为研究对象，对烟灰颗粒的影响因素进行了研究，该地区村庄的木材燃烧是烟灰颗粒的主要来源之一。我们的动机揭示了Df和偏远空气中烟灰颗粒的老化特性，并讨论了它们的区域气候意义。分析结果表明，含烟颗粒占总颗粒数的64%，且多数为硫酸盐或有机涂层老化颗粒。Df序列为裸状烟尘(1.75±0.08)<部分涂覆烟尘(1.82±0.05)<埋灰(1.88±0.05)。老化过程增大了含烟颗粒的总体尺寸，增加了烟灰的致密性。煤烟老化严重依赖于夜间较高的相对湿度。除排放源和涂层工艺外，不同RHs下的涂层气溶胶相是影响烟尘Df的另一个重要因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

环境科学与技术环境科学-工程：环境

CiteScore

17.50

自引率

9.60%

发文量

12359

审稿时长

2.8 months

期刊介绍： Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences. Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.