Light absorption properties of brown carbon over the southeastern Tibetan Plateau

2018 ◽  
Vol 625 ◽  
pp. 246-251 ◽  
Author(s):  
Chong-Shu Zhu ◽  
Jun-Ji Cao ◽  
Ru-Jin Huang ◽  
Zhen-Xing Shen ◽  
Qi-Yuan Wang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Light Absorption ◽  
Absorption Properties ◽  
Brown Carbon ◽  
Southeastern Tibetan Plateau

n ‐Alkanes and PAHs in the Southeastern Tibetan Plateau: Characteristics and Correlations With Brown Carbon Light Absorption

2020 ◽  
Vol 125 (19) ◽  
Author(s):  
Chong‐Shu Zhu ◽  
Li‐Juan Li ◽  
Hong Huang ◽  
Wen‐Ting Dai ◽  
Ya‐Li Lei ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Light Absorption ◽  
Brown Carbon ◽  
Southeastern Tibetan Plateau

scholarly journals A dominant contribution to light absorption by methanol-insoluble brown carbon produced in the combustion of biomass fuels typically consumed in wildland fires in the United States

2022 ◽  
Author(s):  
Khairallah Atwi ◽  
Charles Perrie ◽  
Zezhen Cheng ◽  
Omar El Hajj ◽  
Rawad Saleh
Keyword(s):  
United States ◽  
Solvent Extraction ◽  
Light Absorption ◽  
The United States ◽  
Extraction Methods ◽  
Wildland Fires ◽  
Dominant Contribution ◽  
Biomass Fuels ◽  
Absorption Properties ◽  
Brown Carbon

The light-absorption properties of brown carbon (BrC) are often estimated using offline, solvent-extraction methods. However, recent studies have found evidence of insoluble species of BrC which are unaccounted for in...

Light absorption, fluorescence properties and sources of brown carbon aerosols in the Southeast Tibetan Plateau

2020 ◽  
Vol 257 ◽  
pp. 113616 ◽  
Author(s):  
Guangming Wu ◽  
Xin Wan ◽  
Kirpa Ram ◽  
Peilin Li ◽  
Bin Liu ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Light Absorption ◽  
Fluorescence Properties ◽  
Brown Carbon ◽  
Carbon Aerosols ◽  
Southeast Tibetan Plateau

Light absorption properties of elemental carbon (EC) and water-soluble brown carbon (WS–BrC) in the Kathmandu Valley, Nepal: A 5-year study

2020 ◽  
Vol 261 ◽  
pp. 114239 ◽  
Author(s):  
Pengfei Chen ◽  
Shichang Kang ◽  
Lekhendra Tripathee ◽  
Kirpa Ram ◽  
Maheswar Rupakheti ◽  
...  
Keyword(s):  
Light Absorption ◽  
Elemental Carbon ◽  
Water Soluble ◽  
Kathmandu Valley ◽  
Absorption Properties ◽  
Brown Carbon

Evolution of the light-absorption properties of combustion brown carbon aerosols following reaction with nitrate radicals

2020 ◽  
Vol 54 (7) ◽  
pp. 849-863 ◽  
Author(s):  
Zezhen Cheng ◽  
Khairallah M. Atwi ◽  
Zhenhong Yu ◽  
Anita Avery ◽  
Edward C. Fortner ◽  
...  
Keyword(s):  
Light Absorption ◽  
Absorption Properties ◽  
Brown Carbon ◽  
Nitrate Radicals ◽  
Carbon Aerosols

Light absorption properties, chromophore composition and sources of brown carbon aerosol in Xi’an, Northwest China

2020 ◽  
Author(s):  
Ru-Jin Huang ◽  
Wei Yuan ◽  
Lu Yang ◽  
Jie Guo ◽  
Jing Duan ◽  
...  
Keyword(s):  
Light Absorption ◽  
Coal Combustion ◽  
Radiative Forcing ◽  
Northwest China ◽  
Absorption Efficiency ◽  
Vehicular Emissions ◽  
Absorption Properties ◽  
Seasonal Differences ◽  
Brown Carbon ◽  
The Impact

<p>The impact of brown carbon aerosol (BrC) on the Earth’s radiative forcing balance has been widely recognized but remains uncertain, mainly because the relationships among BrC sources, chromophores, and optical properties of aerosol are poorly understood (Feng et al., 2013; Laskin et al., 2015). In this work, the light absorption properties and chromophore composition of BrC were investigated for samples collected in Xi’an, Northwest China from 2015 to 2016. Both absorption Ångström exponent and mass absorption efficiency show distinct seasonal differences, which could be attributed to the differences in sources and chromophore composition of BrC. Three groups of light-absorbing organics were found to be important BrC chromophores, including those show multiple absorption peaks at wavelength > 350 nm (12 polycyclic aromatic hydrocarbons and their derivatives) and those show single absorption peak at wavelength < 350 nm (10 nitrophenols and nitrosalicylic acids and 3 methoxyphenols). These measured BrC chromophores show distinct seasonal differences and contribute on average about 1.1% and 3.3% of light absorption of methanol-soluble BrC at 365 nm in summer and winter, respectively, about 7 and 5 times higher than the corresponding mass fractions in total organic carbon. The sources of BrC were resolved by positive matrix factorization (PMF) using these chromophores instead of commonly used non-light absorbing organic markers as model inputs. Our results show that in spring vehicular emissions and secondary formation are major sources of BrC (~70%), in fall coal combustion and vehicular emissions are major sources (~70%), in winter biomass burning and coal combustion become major sources (~80%), while in summer secondary BrC dominates (~60%).</p><p> </p><p>References:</p><p>Feng, Y., V. Ramanathan, and V. R. Kotamarthi: Brown carbon: A significant atmospheric absorber of solar radiation?, Atmos. Chem. Phys., 13, 8607-8621, doi:10.5194/acp-13-8607-2013, 2013.</p><p>Laskin, A., J. Laskin, and S. A. Nizkorodov: Chemistry of atmospheric brown carbon, Chem. Rev., 115, 4335-4382, doi:10.1021/cr5006167, 2015.</p>

scholarly journals Supplementary material to "Emission factors and light absorption properties of brown carbon from household coal combustion in China"

2017 ◽  
Author(s):  
Jianzhong Sun ◽  
Guorui Zhi ◽  
Regina Hitzenberger ◽  
Yingjun Chen ◽  
Chongguo Tian ◽  
...  
Keyword(s):  
Light Absorption ◽  
Coal Combustion ◽  
Emission Factors ◽  
Absorption Properties ◽  
Brown Carbon ◽  
Supplementary Material
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