The Aerosol Optical Characteristics in Different Dust Events Based on a 532 nm and 355 nm Polarization Lidar in Beijing
Extreme weather events are happening more frequently as a result of global climate change. Dust storms broke out in the spring of 2017 in China and drastically impacted the local air quality. In this study, a variety of data, including aerosol vertical profiles, surface particle concentration, meteo...
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| Format: | Article |
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MDPI AG
2023-07-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/15/14/3494 |
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| author | Zhenyi Chen Yifeng Huang Zhiliang Yao Tianshu Zhang Guangqiang Fan Xinyue Cao Chengli Ji |
| author_facet | Zhenyi Chen Yifeng Huang Zhiliang Yao Tianshu Zhang Guangqiang Fan Xinyue Cao Chengli Ji |
| author_sort | Zhenyi Chen |
| collection | DOAJ |
| description | Extreme weather events are happening more frequently as a result of global climate change. Dust storms broke out in the spring of 2017 in China and drastically impacted the local air quality. In this study, a variety of data, including aerosol vertical profiles, surface particle concentration, meteorological parameters, and MODIS–derived aerosol optical depth, as well as backward trajectory analysis, were employed to analyze two dust events from April to May in Beijing. The dust plumes were mainly concentrated below 0.8 km, with peak PM10 values of 1000 μg·m<sup>−3</sup> and 300 μg·m<sup>−3</sup> in the two cases. The aerosols showed different vertical distribution characteristics. The pure dust in case 1 from 4 to 5 May 2017 had a longer duration (2 days) and presented a larger aerosol extinction coefficient (2.27 km<sup>−1</sup> at 355 nm and 1.25 km<sup>−1</sup> at 532 nm) than that of the mixed dust in case 2 on 17 April 2017 (2.01 km<sup>−1</sup> at 355 nm and 1.33 km<sup>−1</sup> at 532 nm). The particle depolarization ratio (PDR) remained constant (0.24 ± 0.03 in case 1) from the surface to 0.8 km in height. In contrast, the PDR profile in the mixed dust (case 2) layer was split into two regions—large values exceeding 0.15 above 0.6 km and small values of 0.11 ± 0.03 below 0.6 km. The influence of meteorological information on aerosol distribution was also investigated, and wind was predominant through the observing period. The pure dust in case 1 was mainly from Mongolia, with strong northwest winds, while the near-surface mixed pollution was caused by the combination of long-transported sand and local emission. Furthermore, lidar-derived profiles of dust mass concentrations in the two cases were presented. This study reveals the vertical characteristics of dust aerosols in the production and dissipation of localized dust events and confirms the efficacy of thorough observations with multiple approaches from the ground to space to monitor dust events in real time. |
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| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-11T00:42:33Z |
| publishDate | 2023-07-01 |
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| series | Remote Sensing |
| spelling | doaj.art-fa28f59c8ff2442595ee475d2460b8ad2023-11-18T21:11:34ZengMDPI AGRemote Sensing2072-42922023-07-011514349410.3390/rs15143494The Aerosol Optical Characteristics in Different Dust Events Based on a 532 nm and 355 nm Polarization Lidar in BeijingZhenyi Chen0Yifeng Huang1Zhiliang Yao2Tianshu Zhang3Guangqiang Fan4Xinyue Cao5Chengli Ji6School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, ChinaSchool of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, ChinaSchool of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, ChinaAnhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaAnhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, ChinaSchool of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, ChinaCMA Meteorological Observation Centre, Beijing 100081, ChinaExtreme weather events are happening more frequently as a result of global climate change. Dust storms broke out in the spring of 2017 in China and drastically impacted the local air quality. In this study, a variety of data, including aerosol vertical profiles, surface particle concentration, meteorological parameters, and MODIS–derived aerosol optical depth, as well as backward trajectory analysis, were employed to analyze two dust events from April to May in Beijing. The dust plumes were mainly concentrated below 0.8 km, with peak PM10 values of 1000 μg·m<sup>−3</sup> and 300 μg·m<sup>−3</sup> in the two cases. The aerosols showed different vertical distribution characteristics. The pure dust in case 1 from 4 to 5 May 2017 had a longer duration (2 days) and presented a larger aerosol extinction coefficient (2.27 km<sup>−1</sup> at 355 nm and 1.25 km<sup>−1</sup> at 532 nm) than that of the mixed dust in case 2 on 17 April 2017 (2.01 km<sup>−1</sup> at 355 nm and 1.33 km<sup>−1</sup> at 532 nm). The particle depolarization ratio (PDR) remained constant (0.24 ± 0.03 in case 1) from the surface to 0.8 km in height. In contrast, the PDR profile in the mixed dust (case 2) layer was split into two regions—large values exceeding 0.15 above 0.6 km and small values of 0.11 ± 0.03 below 0.6 km. The influence of meteorological information on aerosol distribution was also investigated, and wind was predominant through the observing period. The pure dust in case 1 was mainly from Mongolia, with strong northwest winds, while the near-surface mixed pollution was caused by the combination of long-transported sand and local emission. Furthermore, lidar-derived profiles of dust mass concentrations in the two cases were presented. This study reveals the vertical characteristics of dust aerosols in the production and dissipation of localized dust events and confirms the efficacy of thorough observations with multiple approaches from the ground to space to monitor dust events in real time.https://www.mdpi.com/2072-4292/15/14/3494polarization lidardustMODISÅngström exponent |
| spellingShingle | Zhenyi Chen Yifeng Huang Zhiliang Yao Tianshu Zhang Guangqiang Fan Xinyue Cao Chengli Ji The Aerosol Optical Characteristics in Different Dust Events Based on a 532 nm and 355 nm Polarization Lidar in Beijing Remote Sensing polarization lidar dust MODIS Ångström exponent |
| title | The Aerosol Optical Characteristics in Different Dust Events Based on a 532 nm and 355 nm Polarization Lidar in Beijing |
| title_full | The Aerosol Optical Characteristics in Different Dust Events Based on a 532 nm and 355 nm Polarization Lidar in Beijing |
| title_fullStr | The Aerosol Optical Characteristics in Different Dust Events Based on a 532 nm and 355 nm Polarization Lidar in Beijing |
| title_full_unstemmed | The Aerosol Optical Characteristics in Different Dust Events Based on a 532 nm and 355 nm Polarization Lidar in Beijing |
| title_short | The Aerosol Optical Characteristics in Different Dust Events Based on a 532 nm and 355 nm Polarization Lidar in Beijing |
| title_sort | aerosol optical characteristics in different dust events based on a 532 nm and 355 nm polarization lidar in beijing |
| topic | polarization lidar dust MODIS Ångström exponent |
| url | https://www.mdpi.com/2072-4292/15/14/3494 |
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