Impact of Atmospheric Aging Processes on The Airborne Black Carbon Size Distributions in Urban Environment

Project: Research

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Description

Particle bound black carbon (BC) is an important component of the light absorbing aerosols in the atmosphere, playing a role in the earth’s radiative balance and climate change. While the mixing states of the BC largely determine the coating on the particles, knowledge of the size distribution of BC is key to the accurate modelling of their absorption of solar radiation. However, there still exists large uncertainty of the role of BC in climate change modelling to date, mostly due to the lack of understanding on the physical existence of black carbon particles in terms of their sizes and fate in the atmosphere etc, which was often limited by techniques available for such investigation. In order to fill up the knowledge gap, we propose here a novel and proven approach of the direct measurement of atmospheric BC size distribution by tandem operation of a differential mobility analyzer and an aethalometer. A wide range of particle sizes (15-700nm) will be investigated to determine the BC mass size distribution from fresh source emissions to ambient environments during their aging processes. The results provide important references for climate modelling to better determine the effect of radiative forcing from urban aerosols.

Detail(s)

Project number7003053
Grant typeSG
StatusFinished
Effective start/end date1/04/1314/07/14