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Characteristics of aerosol optical and meteorological three dust events (2005–2010) Beijing

Characteristics of aerosol optical and meteorological three dust events (2005–2010) Beijing

Characteristics of aerosol optical properties and meteorological parameters during three major dust events (2005–2010)over Beijing,China

Chunxiang Cao a ,b ,Sheng Zheng a ,c ,Ramesh P.Singh d ,?

a

State Key Laboratory of Remote Sensing Science,Jointly Sponsored by the Institute of Remote Sensing and Digital Earth of Chinese Academy of Sciences and Beijing Normal University,Datun Road,Chaoyang District,Beijing 100101,PR China b

Center for Applications of Spatial Information Technologies in Public Health,Datun Road,Chaoyang District,Beijing 100101,PR China c

University of Chinese Academy of Sciences,No.19A,Yuquan Road,Shijingshan District,Beijing 100049,PR China d

School of Earth and Environmental Sciences,Schmid College of Science and Technology,Chapman University,One University Drive,Orange,CA 92866,USA

a r t i c l e i n f o a

b s t r a

c t

Article history:

Received 11May 2014

Received in revised form 12July 2014Accepted 17July 2014

Available online 30July 2014Multi-satellite sensors are capable of monitoring transport and characteristics of dust storms and changes in atmospheric parameters along their transport.The present paper discusses aerosol optical properties and meteorological parameters during major dust storm events occurred in the period 2005–2010over Beijing,China.The back trajectory model shows that the dust is transported from the Inner Mongolia and Mongolia arid regions to Beijing.High aerosol optical depth (AOD)at the wavelength 675nm and low ?ngstr?m exponent (AE)values in the wavelength 440–870nm are observed during dusty days.The aerosol size distribution (ASD)in coarse mode shows a large increase in the volume during dusty days.The single scattering albedo (SSA)increases with higher wavelength on dusty days,and is generally found to be higher compared to the days prior to and after the dust events,indicating the presence of high concentrations of scattering particles due to dust storm events.The physico-chemical properties of aerosols during dusty and non dusty days show distinct characteristics as reflected from the changes in the real and imaginary parts of refractive index (RI).In addition,the CO volume mixing ratio (COVMR)from Atmospheric Infrared Sounder (AIRS)shows a pronounced decrease on dusty days,while the H 2O mass mixing ratio (H 2OMMR)shows enhanced signal.Furthermore,enhanced level of water vapor (WV)using Moderate Resolution Imaging Spectroradiometer (MODIS)data is also observed in and around Beijing over the dust storms track.

?2014Elsevier B.V.All rights reserved.

Keyword:Dust storm Air pollution AERONET MODIS AIRS Beijing

1.Introduction

Since late 20th century,northern parts of China have experienced frequent dust storms (Chen,2001;Zhou and Zhang,2003)that affect the climate,visibility and air quality.The dust events observed in China are originated from Gobi and sand deserts of widespread arid and semiarid regions,which cover 13.6%area of the country (Zhu et al.,1986).Dust storms occur annually during spring season (March –May),and large

quantities of aeolian dust are transported to downwind regions.As a result,they are not only accumulated in the nearby region,forming the Loess Plateau (Liu,1985),but also undergo long-range transport depositing in the North Pacific Ocean (Duce et al.,1980;Shaw,1980).Dust storms with strong winds affect air quality that has serious health threat to the people living in the affected regions (Nickling and Brazel,1984;Littmann,1991;Swap et al.,1996).Episodically,the dust from Mongolia and northern China is transported across the North Pacific basin,reaching North America and beyond (Yu et al.,2008).Dusts influence the air quality,optical properties of aerosols,meteorological and atmospheric parameters,hydrologic cycle,

Atmospheric Research 150(2014)129–142

?Corresponding author.Tel.:+17142892057;fax:+17142892047.E-mail address:rsingh@http://www.wendangku.net/doc/313b68764afe04a1b171de17.html (R.P.

Characteristics of aerosol optical and meteorological three dust events (2005–2010) Beijing

Singh).

http://www.wendangku.net/doc/313b68764afe04a1b171de17.html/10.1016/j.atmosres.2014.07.0220169-8095/?2014Elsevier B.V.All rights reserved.

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