Aerosol optical properties and its radiative forcing over Yulin, China in 2001 and 2002

Che, Huizheng; Zhang, Xiaoye; Alfraro, Stephane; Chatenet, B.; Gomès, L.; Zhao, Jianqi

doi:10.1007/s00376-009-0564-4

Cited by 39 publications

(37 citation statements)

References 34 publications

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“…In order to quantitatively explore detailed spectral absorptive characteristics of dust aerosols over East and Central Asia, we chose four East Asian sites (SACOL, Dalanzadgad, Beijing, and Yulin) and four Central Asian sites (Dushanbe, Karachi, Kandahar, and IASBS). They consist of SACOL located over the Loess Plateau of northwestern China (Huang et al, 2008b;Guan et al, 2009;, Dalanzadgad in the Gobi desert of southern Mongolia (Eck et al, 2005), Beijing downwind of Inner Mongolia (Xia et al, 2007), Yulin on the southwestern fringe of the Mu Us Desert in northwestern China (Xu et al, 2004;Che et al, 2009bChe et al, , 2015, Dushanbe in Tajikistan situated at the transport corridor of Central Asian desert dust (i.e., Karakum Desert; Golitsyn and Gillette, 1993), Karachi located in the southern margin of the Thar Desert in Pakistan and about 20 km from the eastern coast of the Arabian Sea (Alam et al, 2011), Kandahar in the arid area of southern Afghanistan, and IASBS on the Iranian Plateau in northwestern Iran.…”

Section: Site Descriptionmentioning

confidence: 99%

Comparison of key absorption and optical properties between pure and transported anthropogenic dust over East and Central Asia

Huang

Holben

et al. 2016

Atmos. Chem. Phys.

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Abstract. Asian dust particulate is one of the primary aerosol constituents in the Earth-atmosphere system that exerts profound influences on environmental quality, human health, the marine biogeochemical cycle, and Earth's climate. To date, the absorptive capacity of dust aerosol generated from the Asian desert region is still an open question. In this article, we compile columnar key absorption and optical properties of mineral dust over East and Central Asian areas by utilizing the multiyear quality-assured datasets observed at 13 sites of the Aerosol Robotic Network (AERONET). We identify two types of Asian dust according to threshold criteria from previously published literature. (1) The particles with high aerosol optical depth at 440 nm (AOD 440 ≥ 0.4) and a low Ångström wavelength exponent at 440-870 nm (α < 0.2) are defined as Pure Dust (PDU), which decreases disturbance of other non-dust aerosols and keeps high accuracy of pure Asian dust. (2) The particles with AOD 440 ≥ 0.4 and 0.2 < α < 0.6 are designated as Transported Anthropogenic Dust (TDU), which is mainly dominated by dust aerosol and might mix with other anthropogenic aerosol types. Our results reveal that the primary components of high AOD days are predominantly dust over East and Central Asian regions, even if their variations rely on different sources, distance from the source, emission mechanisms, and meteorological characteristics. The overall mean and standard deviation of single-scattering albedo, asymmetry factor, real part and imaginary part of complex refractive index at 550 nm for Asian PDU are 0.935 ± 0.014, 0.742 ± 0.008, 1.526 ± 0.029, and 0.00226 ± 0.00056, respectively, while corresponding values are 0.921 ± 0.021, 0.723 ± 0.009, 1.521 ± 0.025, and 0.00364 ± 0.0014 for Asian TDU. Aerosol shortwave direct radiative effects at the top of the atmosphere (TOA), at the surface (SFC), and in the atmospheric layer (ATM) for Asian PDU (α < 0.2) and TDU (0.2 < α < 0.6) computed in this study, are a factor of 2 smaller than the results of Optical Properties of Aerosols and Clouds (OPAC) mineral-accumulated (mineral-acc.) and mineral-transported (mineral-tran.) modes. Therefore, we are convinced that our results hold promise for updating and improving accuracies of Asian dust characteristics in present-day remote sensing applications and regional or global climate models.

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Section: Site Descriptionmentioning

confidence: 99%

Comparison of key absorption and optical properties between pure and transported anthropogenic dust over East and Central Asia

Huang

Holben

et al. 2016

Atmos. Chem. Phys.

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“…This seasonal AOD pattern may be related to weather conditions. Dust events during spring can induce higher AOD values (Che et al 2009). Average AOD values for the whole winter appear to be lower; this may be due to frequent cold air events.…”

Section: Seasonal Characteristics Of Aod α and Ssa Values In Beijingmentioning

confidence: 99%

Aerosol Optical Properties Retrieved from a Prede Sky Radiometer over an Urban Site of Beijing, China

Che

Shi

Zhao

et al. 2014

Journal of the Meteorological Society of Japan

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SKYNET is an international research network of ground-based Prede sky radiometers for the observation and monitoring of aerosol-cloud-radiation interactions in the atmosphere. The algorithm developed by SKYNET is SKYRAD.pack, which can be used to process the measurement data of Prede instruments. In this study, the latest SKYRAD.pack software (Version 5.0) has been used to retrieve the aerosol optical properties measured by a SKYNET Prede sky radiometer over an urban site of Beijing, China. Continuous data have been processed over a two-year period, and inversion products, including aerosol optical depth (AOD), Ångström exponent (α), volumes of different aerosol particle size distributions, and single-scattering albedos (SSA), have been analyzed.

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“…To date, a large number of studies have focused on aerosol mass concentrations and their physical and chemical properties in various regions of China Yao et al, 2002;Cao et al, , 2004Dan et al, 2004;Guo et al, 2004;Sun et al, 2004;Yao et al, 2004;Cao et al, 2005;Duan et al, 2005;Xu et al, 2005;Yang et al, 2005;Wang et al, 2006;Meng et al, 2007;Zhang et al, 2008aZhang et al, , b, 2009Zhang et al, , 2010a. Yet, only limited in situ measurements have been conducted on aerosol optical properties despite their critical roles in aerosol radiative forcing and their potential impacts on climate and environment (Bergin et al, 2001;Xu et al, 2002Xu et al, , 2004Yan, 2006;Li et al, 2007;Andreae et al, 2008;Garland et al, 2008;Yan et al, 2008;Che et al, 2009;Garland et al, 2009;Yang et al, 2009;Fan et al, 2010;Ma et al, 2011). Few study also showed the relationship between aerosol chemical and optical properties (Cheng et al, 2008;Huang et al, 2010;Tao et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Aerosol Optical Properties Observed at a Semi-arid Rural Site in Northeastern China

2012

Aerosol Air Qual. Res.

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Continuous in situ measurements), respectively, in spring 2011. These values are lower than the majority of measurements made in other areas of China. The mean single scattering albedo (ω) was 0.90, greater than values found in some developed areas in China, indicating more scattering or less absorbing aerosols at Tongyu site. Mean values (and standard deviation) of the Ångström exponent of absorption (α ab ) were 1.61 (0.27) and 1.64 (0.28) for spring of 2010 and 2011, respectively, and of the scattering (α sc ) were 1.48 (0.50) and 1.10 (0.50), respectively. The values of α ab were higher than those of pure BC, implying the presence of other light absorbing materials having larger α ab values. The moderate values of α sc indicated that considerable amount of coarse particles presented at Tongyu site. Distinct diurnal variations of aerosol optical properties were observed. ω, α ab and α sc had nearly opposite diurnal variations compared to those of σ ab and σ sc . Dust aerosols from the northwest and anthropogenic aerosols from the south were major sources contributing to the episodic aerosol events and thus, unusual aerosol optical properties, in spring at Tongyu site. High levels of PM 2.5 , if mainly caused by dust particles, do not necessarily introduce high values of σ ab and σ sc .

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Aerosol optical properties and its radiative forcing over Yulin, China in 2001 and 2002

Cited by 39 publications

References 34 publications

Comparison of key absorption and optical properties between pure and transported anthropogenic dust over East and Central Asia

Comparison of key absorption and optical properties between pure and transported anthropogenic dust over East and Central Asia

Aerosol Optical Properties Retrieved from a Prede Sky Radiometer over an Urban Site of Beijing, China

Aerosol Optical Properties Observed at a Semi-arid Rural Site in Northeastern China

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