In Situ Experimental Study of Cloud-Precipitation Interference by Low-Frequency Acoustic Waves
Since acoustic agglomeration is an effective pre-treatment technique for removing fine particles, it can be considered as a potential technology for applications in aerosol pollution control, industrial dust and mist removal, and cloud and precipitation interference. In this study, the cloud-precipi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/15/4/993 |
| _version_ | 1797618421716746240 |
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| author | Yang Shi Zhen Qiao Guangqian Wang Jiahua Wei |
| author_facet | Yang Shi Zhen Qiao Guangqian Wang Jiahua Wei |
| author_sort | Yang Shi |
| collection | DOAJ |
| description | Since acoustic agglomeration is an effective pre-treatment technique for removing fine particles, it can be considered as a potential technology for applications in aerosol pollution control, industrial dust and mist removal, and cloud and precipitation interference. In this study, the cloud-precipitation interference effect was evaluated in situ based on a multi-dimensional multi-scale monitoring system. The variations in the spatial and temporal distribution of rainfall near the surface and the characteristics of precipitation droplets in the air were investigated. The results indicate that strong low-frequency acoustic waves had a significant impact on the macro-characteristics of rainfall clouds, the microphysical structure of rain droplets and near-surface precipitation, and various microwave parameters. In terms of physical structure, the precipitation cloud’s base height decreased significantly upon opening the acoustic device, while agglomeration and de-agglomeration of raindrops were in a dynamic equilibrium. When the sound generator was on, the particle concentration at a sampling attitude of 500−1700 m and the proportion of particles with diameters of 1–1.5 mm decreased significantly (by 1–5 ln [1/m<sup>3</sup>·mm]). In contrast, the particle concentration increased by 1–3 ln [1/m<sup>3</sup>·mm] at a sampling attitude below 400 m. Moreover, during acoustic interference, the reflectivity factor surged by 2.71 dBZ within 1200 m of the operation centre. Overall, the spatial and temporal distributions of rainfall rates and cumulative precipitation within 5 km of acoustic operation were uneven and influenced by local terrain and background winds. |
| first_indexed | 2024-03-11T08:12:39Z |
| format | Article |
| id | doaj.art-3be17e54c5114f01858fb008d694d7d0 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-11T08:12:39Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-3be17e54c5114f01858fb008d694d7d02023-11-16T23:02:15ZengMDPI AGRemote Sensing2072-42922023-02-0115499310.3390/rs15040993In Situ Experimental Study of Cloud-Precipitation Interference by Low-Frequency Acoustic WavesYang Shi0Zhen Qiao1Guangqian Wang2Jiahua Wei3State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, ChinaSince acoustic agglomeration is an effective pre-treatment technique for removing fine particles, it can be considered as a potential technology for applications in aerosol pollution control, industrial dust and mist removal, and cloud and precipitation interference. In this study, the cloud-precipitation interference effect was evaluated in situ based on a multi-dimensional multi-scale monitoring system. The variations in the spatial and temporal distribution of rainfall near the surface and the characteristics of precipitation droplets in the air were investigated. The results indicate that strong low-frequency acoustic waves had a significant impact on the macro-characteristics of rainfall clouds, the microphysical structure of rain droplets and near-surface precipitation, and various microwave parameters. In terms of physical structure, the precipitation cloud’s base height decreased significantly upon opening the acoustic device, while agglomeration and de-agglomeration of raindrops were in a dynamic equilibrium. When the sound generator was on, the particle concentration at a sampling attitude of 500−1700 m and the proportion of particles with diameters of 1–1.5 mm decreased significantly (by 1–5 ln [1/m<sup>3</sup>·mm]). In contrast, the particle concentration increased by 1–3 ln [1/m<sup>3</sup>·mm] at a sampling attitude below 400 m. Moreover, during acoustic interference, the reflectivity factor surged by 2.71 dBZ within 1200 m of the operation centre. Overall, the spatial and temporal distributions of rainfall rates and cumulative precipitation within 5 km of acoustic operation were uneven and influenced by local terrain and background winds.https://www.mdpi.com/2072-4292/15/4/993meteorologyacoustic interference of atmospherephysical examinationatmospheric water exploitationcloud microphysical characteristicssource region of the Yellow River (SRYR) |
| spellingShingle | Yang Shi Zhen Qiao Guangqian Wang Jiahua Wei In Situ Experimental Study of Cloud-Precipitation Interference by Low-Frequency Acoustic Waves Remote Sensing meteorology acoustic interference of atmosphere physical examination atmospheric water exploitation cloud microphysical characteristics source region of the Yellow River (SRYR) |
| title | In Situ Experimental Study of Cloud-Precipitation Interference by Low-Frequency Acoustic Waves |
| title_full | In Situ Experimental Study of Cloud-Precipitation Interference by Low-Frequency Acoustic Waves |
| title_fullStr | In Situ Experimental Study of Cloud-Precipitation Interference by Low-Frequency Acoustic Waves |
| title_full_unstemmed | In Situ Experimental Study of Cloud-Precipitation Interference by Low-Frequency Acoustic Waves |
| title_short | In Situ Experimental Study of Cloud-Precipitation Interference by Low-Frequency Acoustic Waves |
| title_sort | in situ experimental study of cloud precipitation interference by low frequency acoustic waves |
| topic | meteorology acoustic interference of atmosphere physical examination atmospheric water exploitation cloud microphysical characteristics source region of the Yellow River (SRYR) |
| url | https://www.mdpi.com/2072-4292/15/4/993 |
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