华北地区沙尘天气垂直气溶胶直接辐射强迫

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Abstract Using CALIOP data and SBDART (Santa Barbara DISORT Atmospheric Radiative Transfer) model, the vertical distribution of aerosols and their direct radiative forcing in 8 dusty days between 2013 and 2016 in north China were studied. The effects of vertical distribution and optical properties on aerosol direct radiative forcing were also analyzed. The results showed that, the aerosols are concentrated from the surface to 3km, in which the dust particles are in the upper layer, while polluted continental aerosols and smoke are in the lower layer. The daily mean of aerosol direct radiative forcing is in -38.41~-88.44 W/m² at the top of the atmosphere, and -74.03~-225.86W/m² at the surface and 9.06~137.42W/m² in the atmosphere, respectively. The aerosol direct radiative forcing is negative at 0~8km, and the magnitude gradually decreases as altitude. Vertical distribution has little effect on the magnitude of direct aerosol radiative forcing, but exhibits great influence on its vertical characteristics. The maximum difference of aerosol direct radiative forcing at the same altitude caused by the difference of aerosol profile can reach 31.18W/m². The influence of aerosol optical depth and single scattering albedo on aerosol direct radiative forcing is obvious. When the extinction ability is the same, the attenuation effect of absorbing aerosols or with large backscattering ratio on short-wave sunlight is greater than that of scattering aerosols or with small backscattering ratio.

Key words： aerosol direct radiative forcing vertical distribution radiative transfer model north China dust events

Received: 19 April 2020

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X513

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	Articles by authors
	HOU Can
	ZHANG Feng
	HUANG Yong
	WU Wen-yu
	DENG Xue-liang
	TAO Ming-hui

Cite this article:

HOU Can,ZHANG Feng,HUANG Yong等. Vertical distribution of aerosol direct radiative forcing in dust events over north China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(12): 5169-5181.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I12/5169

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