Two-Wavelength Lidar for Observation of Aerosol Optical and Hygroscopic Properties in Fog and Haze Days

Guangyu, 伯广宇 Bo; Dong, 刘东 Liu; Decheng, 吴德成 Wu; Bangxin, 王邦新 Wang; Zhiqing, 钟志庆 Zhong; Chenbo, 谢晨波 Xie; Jun, 周军 Zhou

doi:10.3788/cjl201441.0113001

Cited by 6 publications

(7 citation statements)

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“…Meanwhile PM 2.5 can degrade the atmospheric visibility and affect traffic safety by the extinction effect. In recent years, a series of experiments or monitors about fine particle matter are researched in many mega cities in China by institutes (Mao et al, 2002;Che et al, 2015), and the results indicated that the PM 2.5 mass concentration was increased.…”

Section: Introductionmentioning

confidence: 99%

Profiling the PM2.5 mass concentration vertical distribution in the boundary layer

Wang¹,

Yang²,

Shan³

et al. 2015

Preprint

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Abstract. Fine particle (PM2.5) affects human life and activities directly; the detection of PM2.5 mass concentration profile is very essential due to its practical and scientific meanings (such as, quantifying of air quality and its variability, and improving air quality forecast and assessment). But so far, it is difficult to detect PM2.5 mass concentration profile. The proposed methodology to study the relationship between aerosol extinction coefficient and PM2.5 mass concentration is described, which indicates that the PM2.5 mass concentration profile could be retrieved by combining a charge-coupled device (CCD) side-scatter lidar and a PM2.5 sampling detector. When the relative humidity is less than 70 %, PM2.5 mass concentration is proportional to aerosol extinction coefficient, and then the specific coefficient can be calculated. Using this specific coefficient, aerosol extinction profile is converted to PM2.5 mass concentration profile. Three cases of clean night (on 21 September 2014), pollutant night (on 17 March 2014), and heavy pollutant night (on 13 February 2015) are studied. The characteristic of PM2.5 mass concentration profile in near-ground during these three nights' cases in the western suburb of Hefei city was discussed. The PM2.5 air pollutant concentration is comparatively large in close surface varying with time and altitude. The experiment results show that the CCD side-scatter lidar combined with a PM2.5 detector is an effective and new method to explore pollutant mass concentration profile in near-ground.

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Section: Introductionmentioning

confidence: 99%

Profiling the PM2.5 mass concentration vertical distribution in the boundary layer

Wang¹,

Yang²,

Shan³

et al. 2015

Preprint

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“…But the common backscattering lidar system has a shortcoming in the lower hundreds of meters because of the geometric form factor (GFF) caused by the configuration of the transmitter divergence and receiver's field of view (FOV) at the near range (Mao et al, 2012;Wang et al, 2015b). With the recently developed technique of the CCD side-scattering lidar (Bernes et al, 2003;Tao et al, 2014a;Ma et al, 2014), the problem caused by the GFF could be solved. Moreover, the nearer range and the better spatial resolution could be obtained.…”

Section: Introductionmentioning

confidence: 99%

“…Lidar, in principle, can provide the ability to observe these processes where they occur. Backscattering lidar is a powerful tool to detect aerosol profile, and is widely used in atmospheric monitoring (Weitkamp, 2005;Winker et al, 2007;Bo et al, 2014;Wang et al, 2014b). But the common backscattering lidar system has a shortcoming in the lower hundreds of meters because of the geometric form factor (GFF) caused by the configuration of the transmitter divergence and receiver's field of view (FOV) at the near range (Mao et al, 2012;Wang et al, 2015b).…”

Section: Introductionmentioning

confidence: 99%

Profiling the PM2.5 mass concentration vertical distribution in the boundary layer

et al. 2016

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Abstract. Fine particles (PM 2.5 ) affect human life and activities directly; the detection of PM 2.5 mass concentration profile is very essential due to its practical and scientific significance (such as the quantification of air quality and its variability as well as the assessment of improving air quality forecast). But so far, it has been difficult to detect PM 2.5 mass concentration profile. The proposed methodology to study the relationship between aerosol extinction coefficient and PM 2.5 mass concentration is described, which indicates that the PM 2.5 mass concentration profile could be retrieved by combining a charge-coupled device (CCD) side-scatter lidar with a PM 2.5 sampling detector. When the relative humidity is less than 70 %, PM 2.5 , mass concentration is proportional to the aerosol extinction coefficient, and then the specific coefficient can be calculated. Through this specific coefficient, aerosol extinction profile is converted to PM 2.5 mass concentration profile. Three cases of clean night (on 21 September 2014), pollutant night (on 17 March 2014), and heavy pollutant night (on 13 February 2015) are studied. The characteristics of PM 2.5 mass concentration profile at the near-ground level during the cases of these 3 nights in the western suburb of Hefei city were discussed. The PM 2.5 air pollutant concentration is comparatively large close to the surface and varies with time and altitude. The experiment results show that the CCD side-scatter lidar combined with a PM 2.5 detector is an effective and new method to explore pollutant mass concentration profile at the near-ground level.

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“…It is an interesting subject if we just focus on the surface particles for a better understanding of the dust-pollutant mixing process. Under this circumstance, both the lidar ratio and the lidar's blind zone problem that were mentioned earlier can be avoided by using a horizontally pointing Mie lidar [6][7][8] . The objective of this study is to investigate the optical properties of surface dust by using a horizontally pointing Mie lidar.…”

mentioning

confidence: 99%

“…The signals were recorded with a temporal resolution of 5 min and a spatial resolution of 7.5 m. Two wavelength extinction coefficients at 532 and 1064 nm, where the particle's depolarization ratio (DR) is 532 nm, and the extinction related Ångstrom exponent (AE) [9] have been observed, while the data processing methods of the horizontally pointing lidar can be found in Ref. [7]. The characteristic of the particle hygroscopic properties during a dust event was also investigated based on the synchronous measurement of the particle's optical properties and atmospheric relative humidity (RH).…”

mentioning

confidence: 99%

Optical and hygroscopic properties of Asian dust particles based on a horizontal Mie lidar: case study at Hefei, China

et al. 2017

Chin. Opt. Lett.

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As an extension of the Mie lidar technique to measure the extinction coefficient of the surface particles, a horizontally pointing Mie lidar is used for determining the optical properties of Asian dust, which is an approach without knowing the actual lidar ratio. A long lasting dust event is observed based on this approach in May 2014. The "no dust," "pure dust," and "polluted dust" stage is observed during this event, and their optical and hygroscopic properties are discussed. Some new optical and hygroscopic features are observed, which benefit from the quantitative, multi-wavelength, and continuous measurement of the extinction related optical properties of dust particles.

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Two-Wavelength Lidar for Observation of Aerosol Optical and Hygroscopic Properties in Fog and Haze Days

Cited by 6 publications

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Profiling the PM<sub>2.5</sub> mass concentration vertical distribution in the boundary layer

Profiling the PM<sub>2.5</sub> mass concentration vertical distribution in the boundary layer

Profiling the PM<sub>2.5</sub> mass concentration vertical distribution in the boundary layer

Optical and hygroscopic properties of Asian dust particles based on a horizontal Mie lidar: case study at Hefei, China

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Two-Wavelength Lidar for Observation of Aerosol Optical and Hygroscopic Properties in Fog and Haze Days

Cited by 6 publications

References 0 publications

Profiling the PM&lt;sub&gt;2.5&lt;/sub&gt; mass concentration vertical distribution in the boundary layer

Profiling the PM&lt;sub&gt;2.5&lt;/sub&gt; mass concentration vertical distribution in the boundary layer

Profiling the PM&lt;sub&gt;2.5&lt;/sub&gt; mass concentration vertical distribution in the boundary layer

Optical and hygroscopic properties of Asian dust particles based on a horizontal Mie lidar: case study at Hefei, China

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Profiling the PM<sub>2.5</sub> mass concentration vertical distribution in the boundary layer

Profiling the PM<sub>2.5</sub> mass concentration vertical distribution in the boundary layer

Profiling the PM<sub>2.5</sub> mass concentration vertical distribution in the boundary layer