Distribution and origin of carbonaceous aerosol over a rural high-mountain lake area, Northern China and its transport significance

被引：70

作者：

Han, Y. M. ^{[1
]}

Han, Z. W. ^{[2
]}

Cao, J. J. ^{[1
,3
]}

Chow, J. C. ^{[1
,4
]}

Watson, J. G. ^{[1
,4
]}

An, Z. S. ^{[1
]}

Liu, S. X. ^{[1
]}

Zhang, R. J. ^{[2
]}

机构：

[1] Chinese Acad Sci, SKQLLOG, Inst Earth Environm, Xian 710075, Peoples R China

[2] Chinese Acad Sci, Inst Atmospher Phys, Beijing 100029, Peoples R China

[3] Xian Jiaotong Univ, Dept Environm Sci, Xian 710049, Peoples R China

[4] Desert Res Inst, Reno, NV 89512 USA

来源：

ATMOSPHERIC ENVIRONMENT | 2008年 / 42卷 / 10期

基金：

中国国家自然科学基金;

关键词：

black carbon; char; soot; Char-/soot-EC ratios; thermal/optical reflectance (TOR) method;

D O I：

10.1016/j.atmosenv.2007.12.020

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

PM2.5 and TSP samples were collected at Lake Daihai, a rural high-mountain area in China, in four seasons during 2005-2007. Organic carbon (OC), elemental carbon (EC), char-EC, and soot-EC were analyzed using the thermal/optical reflectance (TOR) method with different temperature plateaus and oxidation atmospheres. TC, OC, EC, and char-EC concentrations of TSP and PM2.5 showed seasonal variations with the highest concentrations in winter and the lowest in Summer, while soot-EC reveals a little different variation, with the highest concentration in spring, indicating different source contributions from other parameters. OC/EC correlations were weaker at Daihai than those from urban areas. Although little differences existed in TSP and PM2.5, average OC/EC ratios varied seasonally and ranged from similar to 9.0 in winter to similar to 5.0 in spring. Char-/soot-EC ratios showed similar pattern, with the highest average ratios (> 3.0) in winter, consistent with the contributions from residential biomass burning and coal combustion. Back trajectories related the highest carbon concentrations with the southeasterly air masses and the lowest carbon levels with northward flows. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：2405 / 2414

页数：10

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