Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

The Relationship of PM Variation to Visibility and Mixing Layer Height under Haze/Fog Condition in Multi-Cities of Northeast China

Hujia Zhao
,
Huizheng Che
* ORCID logo ,
Yanjun Ma
,
Yangfeng Wang
,
Hongbin Yang
,
Yuche Liu
,
Yaqiang Wang
,
Hong Wang
,
Xiaoye Zhang
Version 1 : Received: 20 March 2017 / Approved: 20 March 2017 / Online: 20 March 2017 (11:57:10 CET)

A peer-reviewed article of this Preprint also exists.

Zhao, H.; Che, H.; Ma, Y.; Wang, Y.; Yang, H.; Liu, Y.; Wang, Y.; Wang, H.; Zhang, X. The Relationship of PM Variation with Visibility and Mixing-Layer Height under Hazy/Foggy Conditions in the Multi-Cities of Northeast China. Int. J. Environ. Res. Public Health 2017, 14, 471. Zhao, H.; Che, H.; Ma, Y.; Wang, Y.; Yang, H.; Liu, Y.; Wang, Y.; Wang, H.; Zhang, X. The Relationship of PM Variation with Visibility and Mixing-Layer Height under Hazy/Foggy Conditions in the Multi-Cities of Northeast China. Int. J. Environ. Res. Public Health 2017, 14, 471.

Abstract

The variations of visibility, PM mass concentration and mixing layer height (MLH) at four major urban-industry regions (Shenyang, Anshan, Benxi and Fushun) in multi-cities of central Liaoning over northeast China were evaluated from 2009-2012 to characterize the dynamics effect on air pollution. The annual mean visibilities were about 13.7±7.8km, 13.5±6.5km, 12.8±6.1km and 11.5±6.8km in Shenyang, Anshan, Benxi and Fushun, respectively. The pollution load (PM×MLH) shown a weaker vertical diffusion in Anshan with a higher PM concentration in the near-surface. High concentrations of fine mode particles may be partially attributed to the biomass burning emissions from September in Liaoning Province and surrounding regions in Northeast China as well as the coal burning during the heating period with lower MLH in winter. The increasing wind speed has a similar change as the increasing of mixing layer height to make the effect on the aerosol vertical diffusion. The visibility on the non haze-fog days was about 2.5-3.0 times higher than that on hazy and fog days. The fine particle concentrations of PM2.5 and PM1.0 on the haze and fog days were ~1.8-1.9 times and ~1.5 times higher than that on no hazy-fog days. The MLH during fog pollution showed more declining trend than haze pollution compared with non haze-fog days. The results of this study could provide the useful information to better recognize the effects of vertical pollutants diffusion on air quality in the multi-cities of central Liaoning over Northeast China.

Keywords

visibility; PM; MLH; multi-cities; northeast China

Subject

Environmental and Earth Sciences, Environmental Science

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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