NDLI: Aerosol Optical Properties and Direct Radiative Effects over Central China

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Aerosol Optical Properties and Direct Radiative Effects over Central China

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Aerosol Optical Properties and Direct Radiative Effects over Central China

Content Provider	MDPI
Author	Zhang, Ming Wang, Lunche Gong, Wei Ma, Yingying Liu, Boming
Abstract	Central China is important for aerosols and climate because it is among the worst regions for air pollution in China. However, it is understudied due to a lag in establishing an atmospheric monitoring network. So we did a comprehensive analysis using multiple techniques to improve the understanding of aerosol optical properties and their radiative effect in this region. The results showed that high aerosol optical depth (AOD) was generally found in the northern and central parts, whereas low values were observed in the southern and western parts. Most regions were predominantly loaded with small aerosol particles and a significant influence of long-distance transported dust was found in springtime. A strong and significantly decreasing trend was observed with a maximum decrease rate of −0.08 per year in the northern and western parts, related to the decreasing emission of aerosols and increasing rainfall. Aerosol optical properties and radiative effects were compared between an urban site, Wuhan, and a rural site, Dengfeng. The seasonal variations of AOD and Ångström exponent (AE) are similar for Wuhan and Dengfeng, but both values are larger in Wuhan than in Dengfeng. A greater dominance of coarse-mode and absorbing aerosols was found over Dengfeng. Annual averaged aerosol radiative effect (ARE) in shortwave spectrum (ARESW) and its efficiency (REE) are −48.01 W/m2 and −51.38 W/m2, respectively, in Wuhan, −40.02 W/m2 and −53.26 W/m2, respectively, in Dengfeng. The dependence of REE on aerosol absorptive and size properties was studied; the results showed that REE was strongly influenced by the aerosol absorptivity and size of fine-mode particles, but there was not a strong correlation between REE and AE. The percentage of ARE in visible spectrum (AREVIS) in ARESW in Wuhan was 3% lower than in Dengfeng. The AREVIS percentage depended largely on aerosol particle size, but was less influenced by aerosol absorptivity.
File Size	22976512
File Format	PDF
e-ISSN	20724292
DOI	10.3390/rs9100997
Journal	Remote Sensing
Issue Number	10
Volume Number	9
Language	English
Publisher Date	2017-09-26
Access Restriction	Open
Subject Keyword	aerosols radiative effect source region analysis
Content Type	Text
Resource Type	Article

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