Evidence in biomass burning smoke for a light-absorbing aerosol with properties intermediate between brown and black carbon

被引：41

作者：

Adler, Gabriela ^{[1
,2
,4
]}

Wagner, Nicholas L. ^{[1
,2
]}

Lamb, Kara D. ^{[1
,2
]}

Manfred, Katherine M. ^{[1
,2
,5
,6
]}

Schwarz, Joshua P. ^{[1
]}

Franchin, Alessandro ^{[1
,2
]}

Middlebrook, Ann M. ^{[1
]}

Washenfelder, Rebecca A. ^{[1
]}

Womack, Caroline C. ^{[1
,2
]}

Yokelson, Robert J. ^{[3
]}

Murphy, Daniel M. ^{[1
]}

机构：

[1] NOAA, CSD, ESRL, Boulder, CO USA

[2] Univ Colorado Boulder, CIRES, Boulder, CO USA

[3] Univ Montana, Dept Chem, Missoula, MT 59812 USA

[4] Breezometer, Haifa, Israel

[5] Univ Oxford, Dept Earth Sci, Oxford, England

[6] Univ Oxford, Dept Chem, Oxford, England

来源：

AEROSOL SCIENCE AND TECHNOLOGY | 2019年 / 53卷 / 09期

关键词：

TRACE GAS EMISSIONS; OPTICAL-PROPERTIES; ABSORPTION ENHANCEMENT; ORGANIC-CARBON; TAR BALLS; PHYSICOCHEMICAL PROPERTIES; RESOLVED MEASUREMENTS; SOOT; PARTICLES; DEPENDENCE;

D O I：

10.1080/02786826.2019.1617832

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Biomass combustion produces black carbon (BC) and brown carbon (BrC) aerosols that contribute substantially to warming the Earth's atmosphere. Accurate knowledge of their emissions and absorption per unit mass (mass absorption cross-section; MAC) can be used to quantify the radiative impact of these combustion products. We isolated particles generated from laboratory biomass burning fires by morphology and found that some particles from biomass burning do not correspond to either BC or BrC according to common operational definitions. Unlike BrC, these particles strongly absorb red light, with a MAC and spectral dependence of absorption between that of BrC and BC. They also have intermediate volatility: they survive thermodenuding at 250 degrees C but do not heat to incandescence in a single particle soot photometer (SP2) instrument. We also found evidence for intermediate properties in ambient wildfire smoke from the 2013 Rim Fire in California. More work is needed to understand how much this intermediate material contributes to atmospheric light absorption from typical combustion, whether or not it corresponds to "tar balls," and how it may affect previous MAC measurements that were attributed to enhanced absorption by transparent coatings. Copyright (c) 2019 American Association for Aerosol Research

引用

页码：976 / 989

页数：14

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