Opposite long-term trends in aerosols between low and high altitudes: a testimony to the aerosol–PBL feedback

doi:10.5194/acp-17-7997-2017

GSTDTAP > 地球科学

DOI	10.5194/acp-17-7997-2017
	Opposite long-term trends in aerosols between low and high altitudes: a testimony to the aerosol–PBL feedback
	Zipeng Dong, Zhanqing Li, Xing Yu, Maureen Cribb, Xingmin Li, and Jin Dai
	2017-06-30
发表期刊	Atmospheric Chemistry and Physics
出版年	2017
英文摘要	Interactions between absorbing aerosols and the planetary boundary layer (PBL) play an important role in affecting air pollution near the surface. In this study, a unique feature of the aerosol–PBL interaction is identified that has important implications in monitoring and combating air pollution. Opposite trends in aerosol loading between the lower and upper PBL are shown on a wide range of timescales and data acquired by various platforms: from a short-term field experiment to decadal satellite observations and multidecadal ground observations in China. A novel method is proposed to obtain the vertical profiles of aerosol loading from passive sensors by virtue of varying elevations. The analyses of visibility, aerosol optical depth, and extinction with different temporal scales exhibit the similar trend, i.e., increasing in the lower atmosphere but decreasing in the upper atmosphere. Integration of the reversal aerosol trend below and above the PBL resulted in a much less change in the column-integrated quantities. The surface cooling effect, together with the change in the heating rate induced by the absorbing aerosol, unevenly modifies the atmospheric temperature profile, causing a more stable atmosphere inside the PBL but a destabilized atmosphere above the PBL. Such a change in the atmospheric stability favors the accumulation of pollutants near the surface and the vertical diffusion of aerosol particles in the upper atmosphere, both of which are consistent with the observed reversal aerosol trends. These findings have multiple implications in understanding and combating air pollution, especially in many developing countries with high emissions of light-absorbing aerosols.
领域	地球科学
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引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/287883
专题	地球科学
推荐引用方式 GB/T 7714	Zipeng Dong, Zhanqing Li, Xing Yu, Maureen Cribb, Xingmin Li, and Jin Dai. Opposite long-term trends in aerosols between low and high altitudes: a testimony to the aerosol–PBL feedback[J]. Atmospheric Chemistry and Physics,2017.
APA	Zipeng Dong, Zhanqing Li, Xing Yu, Maureen Cribb, Xingmin Li, and Jin Dai.(2017).Opposite long-term trends in aerosols between low and high altitudes: a testimony to the aerosol–PBL feedback.Atmospheric Chemistry and Physics.
MLA	Zipeng Dong, Zhanqing Li, Xing Yu, Maureen Cribb, Xingmin Li, and Jin Dai."Opposite long-term trends in aerosols between low and high altitudes: a testimony to the aerosol–PBL feedback".Atmospheric Chemistry and Physics (2017).