Clear-Air Bragg Scattering Observed above the Convective Boundary Layer in the Morning
Reflected waves have been frequently observed via weather radar, even during sunny, cloudless days. Additionally, it is recognized that turbulence and biological scatterers can also dominate the scattering process. In previous studies, echo returns of turbulence from clear-air Bragg scattering (CABS...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-04-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/15/9/2241 |
| _version_ | 1827742698377838592 |
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| author | Yupeng Teng Tianyan Li Hongbin Chen Shuqing Ma |
| author_facet | Yupeng Teng Tianyan Li Hongbin Chen Shuqing Ma |
| author_sort | Yupeng Teng |
| collection | DOAJ |
| description | Reflected waves have been frequently observed via weather radar, even during sunny, cloudless days. Additionally, it is recognized that turbulence and biological scatterers can also dominate the scattering process. In previous studies, echo returns of turbulence from clear-air Bragg scattering (CABS) have been used to detect the height of the convective boundary layer (CBL). However, in a dual-frequency antenna multiplexing radar system, through which the dual-wavelength ratio (DWR) identifies the CABS clearly, CABS can be unexpectedly observed not only at the edge of the CBL but also above the CBL, highlighting the need for an expanded set of causes of clear-air echoes. It was further identified that the negative second derivative of horizontal wind speed, which is measured by a coherent Doppler Lidar, is consistent with the variation of the CABS layers’ height above the CBL. These results emphasize the presence of physical processes leading to turbulence in the troposphere, with implications for Bragg scattering studies and the theory of turbulence in general. This study will help the ecology of research better understand the laws of biological activity. |
| first_indexed | 2024-03-11T04:07:48Z |
| format | Article |
| id | doaj.art-451c16db609f4af69e72c86a7f9a827d |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-11T04:07:48Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-451c16db609f4af69e72c86a7f9a827d2023-11-17T23:37:26ZengMDPI AGRemote Sensing2072-42922023-04-01159224110.3390/rs15092241Clear-Air Bragg Scattering Observed above the Convective Boundary Layer in the MorningYupeng Teng0Tianyan Li1Hongbin Chen2Shuqing Ma3Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, ChinaInstitute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, ChinaInstitute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, ChinaMeteorological Observation Centre, China Meteorological Administration, Beijing 100089, ChinaReflected waves have been frequently observed via weather radar, even during sunny, cloudless days. Additionally, it is recognized that turbulence and biological scatterers can also dominate the scattering process. In previous studies, echo returns of turbulence from clear-air Bragg scattering (CABS) have been used to detect the height of the convective boundary layer (CBL). However, in a dual-frequency antenna multiplexing radar system, through which the dual-wavelength ratio (DWR) identifies the CABS clearly, CABS can be unexpectedly observed not only at the edge of the CBL but also above the CBL, highlighting the need for an expanded set of causes of clear-air echoes. It was further identified that the negative second derivative of horizontal wind speed, which is measured by a coherent Doppler Lidar, is consistent with the variation of the CABS layers’ height above the CBL. These results emphasize the presence of physical processes leading to turbulence in the troposphere, with implications for Bragg scattering studies and the theory of turbulence in general. This study will help the ecology of research better understand the laws of biological activity.https://www.mdpi.com/2072-4292/15/9/2241radarclear-air echoBragg scatteringturbulenceboundary layer |
| spellingShingle | Yupeng Teng Tianyan Li Hongbin Chen Shuqing Ma Clear-Air Bragg Scattering Observed above the Convective Boundary Layer in the Morning Remote Sensing radar clear-air echo Bragg scattering turbulence boundary layer |
| title | Clear-Air Bragg Scattering Observed above the Convective Boundary Layer in the Morning |
| title_full | Clear-Air Bragg Scattering Observed above the Convective Boundary Layer in the Morning |
| title_fullStr | Clear-Air Bragg Scattering Observed above the Convective Boundary Layer in the Morning |
| title_full_unstemmed | Clear-Air Bragg Scattering Observed above the Convective Boundary Layer in the Morning |
| title_short | Clear-Air Bragg Scattering Observed above the Convective Boundary Layer in the Morning |
| title_sort | clear air bragg scattering observed above the convective boundary layer in the morning |
| topic | radar clear-air echo Bragg scattering turbulence boundary layer |
| url | https://www.mdpi.com/2072-4292/15/9/2241 |
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