Black carbon radiative forcing at TOA decreased during aging
作者:Wu, Y (Wu, Yu)[ 1 ] ; Cheng, TH (Cheng, Tianhai)[ 1 ] ; Zheng, LJ (Zheng, Lijuan)[ 1 ] ; Chen, H (Chen, Hao)[ 1 ]
出版年: DEC 5 2016
During aging processing, black carbon (also called soot) particles may tend to be mixed with other aerosols, and highly influence their radiative forcing. In this study, freshly emitted soot particles were simulated as fractal aggregates composed of small spherical primary monomers. After aging in the atmosphere, soot monomers were coated by a thinly layer of sulfate as thinly coated soot particles. These soot particles were entirely embedded into large sulfate particle by further aging, and becoming heavily coated soot particles. In clear-sky conditions, black carbon radiative forcing with different aging states were investigated for the bottom and top of atmosphere (BOA and TOA). The simulations showed that black carbon radiative forcing increased at BOA and decreased at TOA after their aging processes. Thinly and heavily coated states increased up to similar to 12% and similar to 35% black carbon radiative forcing at BOA, and black carbon radiative forcing at TOA can reach to similar to 20% and similar to 100% smaller for thinly and heavily coated states than those of freshly emitted states, respectively. The effect of aging states of black carbon radiative forcing was varied with surface albedo, aerosol optical depth and solar zenith angles. These findings would be helpful for the assessments of climate change.
通讯作者地址: Cheng, TH (通讯作者)
Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing 100864, Peoples R China.
[ 1 ] Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing 100864, Peoples R China