Emission Characteristics of Primary Brown Carbon Absorption From Biomass and Coal Burning: Development of an Optical Emission Inventory for China
Emission Characteristics of Primary Brown Carbon Absorption From Biomass and Coal Burning: Development of an Optical Emission Inventory for China
复制标题
生物质和煤炭燃烧的原生棕色碳吸收的排放特征：中国光学排放清单的开发
DOI：
10.1029/2018jd029352
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发表时间：
2019-02-16
影响因子：
4.4
通讯作者：
Cao, Junji
中科院分区：
文献类型：
--
作者：
Tian, Jie;Wang, Qiyuan;Cao, Junji
棕碳（BrC）影响地球的辐射平衡，因为它对短波长的光有很强的吸收。利用自制的燃烧室模拟生物质和煤的燃烧，研究了BrC吸收的排放特性。在370和880 nm波长对的吸收埃-恩格斯特伦指数（AAE）范围从1.19到3.25，表明生物质和燃煤排放中可能存在BrC。在AAE（BC）=1.0的假设下，生物质燃烧产生的BrC对颗粒物370 nm光吸收的贡献率为41-85%，远高于燃煤产生的BrC（15-18%）。生物质燃烧和煤燃烧的BrC在370 nm处的吸收发射因子分别为15-47和2- 13 m（2）/kg。基于实测的BrC值吸收发射因子和高分辨率活度数据，编制了2015年中国生物质和燃煤10 × 10 km网格化BrC光排放清单。生物质和居民燃煤的BrC年吸收截面排放总量分别为4，194 Gm（2）（95%置信水平下的相对不确定性为-33.2，41.2%）和615 Gm（2）（-39.3，40.1%）。这些结果将有助于改进我国BrC辐射效应的估算。
Brown carbon (BrC) affects the Earth's radiative balance due to its strong light absorption at short wavelengths. A custom-made combustion chamber was used to simulate biomass and coal burning and to investigate the emission characteristics of BrC absorption. Absorption angstrom ngstrom exponents (AAEs) at the wavelength pair of 370 and 880nm ranged from 1.19 to 3.25, suggesting the possible existence of BrC in biomass- and coal-burning emissions. Based on the assumption that AAE(BC)=1.0, BrC from biomass burning contributed to 41-85% of the total particles light absorption at 370nm, which is much higher than that from coal burning (15-18%). The estimated absorption emission factors of BrC at 370nm for biomass and coal burning were 15-47 and 2-13m(2)/kg, respectively. A 10x10km gridded BrC optical emission inventory for biomass and coal burning in China for 2015 was developed based on the measured absorption emission factors of BrC values and high-resolution activity data. The total annual BrC absorption cross section emissions from biomass and residential coal burning were 4,194Gm(2) (relative uncertainty at the 95% confidence level of -33.2, 41.2%) and 615Gm(2) (-39.3, 40.1%), respectively. These results should be useful for improving estimates of the radiative effects of BrC in China.