太湖北岸气溶胶光学特性长期变化特征

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Abstract

Using the sun photometer (CE-318) ground observationsat the north bank of Tai Lake together with in-situ meteorological observations from September 2005 to April 2016,this paper analyzed systematically the long-term variation of aerosol optical properties at Tai Lake including annual,seasonal and monthly features as well as its influence factors.It was revealed that:1) the annual average of AOD (aerosol optical depth) from 2005 to 2016 reached 0.776,while that from 2005 to 2012 was 0.842 and 63% higher than the national average during the same time;2) the seasonal variations of AOD were obviously featured with the highest value in summer (0.920),the lowest value in winter (0.689) and similar in spring (0.788) and autumn (0.788);3) the Angstrom factor displayed an gradually increasing trend and the annual increment reached 0.013,which indicates that the average size of air pollutantparticulatesat Tai Lake was decreasing along with the increasing of non-natural source;4) the seasonal Angstrom value decreased from autumn to winter,summer and spring in order,followed by 1.320,1.232,1.164,and 1.098;5) the aerosol volume spectra showed a double-peak-structure in four seasons,and the volume concentrations of accumulation mode and coarse mode particulates were close in summer and winter,and the mainparticulatesinspring and autumn were coarse mode and accumulation mode,respectively;6) the annual seasonal variations of single scattering albedo (SSA) were similar,and the seasonal SSA value decreased from autumn to summer,springand winterin order,followed by 0.933,0.917,0.900,and 0.882,but the annual SSA averages displayed an increasing trend with annual increment being 0.006 since 2007,which indicated that the scattering ability of aerosolparticulatesat Tai Lake was increasing gradually.

Key words： aerosol aerosol optical depth Angstrom exponent volume spectrum single scattering albedo variation features Tai Lake

Received: 15 November 2016

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X513

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	HAN Ya-fang
	WU Li-xin
	BAI Yang
	QIN Kai

Cite this article:

HAN Ya-fang,WU Li-xin,BAI Yang等. Long-term variation of aerosol optical properties at Tai Lake's north bank[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(7): 2492-2503.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2017/V37/I7/2492

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