Diagnosis and Numerical Simulation of Low-level Wind Shear over the Hengduan Mountains in Winter
Cangyuan Washan Airport, located at Delong Mountain in the Hengduan Mountains, is prone to low level wind shear during takeoff and landing in winter, which is of great harm to aviation safety, and aviation departments attach great importance to it. It is also a key problem in refined weather forecas...
Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Editorial Office of Journal of Applied Meteorological Science
2025-01-01
|
| Series: | 应用气象学报 |
| Subjects: | |
| Online Access: | http://qikan.camscma.cn/en/article/doi/10.11898/1001-7313.20250108 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832586845097033728 |
|---|---|
| author | Ren Juzhang Yang Xue Tao Yun Fu Zhijia Chen Yan Zhong Yahan Wang Man Jin Yan |
| author_facet | Ren Juzhang Yang Xue Tao Yun Fu Zhijia Chen Yan Zhong Yahan Wang Man Jin Yan |
| author_sort | Ren Juzhang |
| collection | DOAJ |
| description | Cangyuan Washan Airport, located at Delong Mountain in the Hengduan Mountains, is prone to low level wind shear during takeoff and landing in winter, which is of great harm to aviation safety, and aviation departments attach great importance to it. It is also a key problem in refined weather forecasting and early warning under complex terrain. Therefore, it is essential to examine changes in low-level wind circulation around the airport. Using NCEP/NCAR reanalysis data, airport weather station data, encrypted automatic weather station data and wind profile radar data, a low-level wind shear turn-around event at Cangyuan Wushan Airport on 29 December 2021, is diagnosed and analyzed by statistical and numerical simulation methods. Results indicate that during winter, the southwest airflow prevails in the Hengduan Mountains, and the surface wind speed is relatively low. The small-scale local valley wind circulation in the east of Cangyuan Washan Airport is obvious. During daytime, the prevailing valley wind blows from the valley toward the airport. At night, the mountain wind blows from the airport back to the valley. Additionally, a vertical downdraft predominates in the approach area. However, there is a consistent southwest breeze in the afternoon. When the wind speed increases to more than 5.0 m·s-1, the prevailing southwest wind will cross the mountain, and the cross-mountain air on the ground will converge with the increased valley wind in the approach area, resulting in instantaneous vertical upward movement and forming low-level wind shear. The rapid fluctuations in wind direction and speed near the ground in the dam area on the east side of the airport significantly affects aviation safety. With the weakening of the solar radiation, the prevailing wind and valley wind begins to weaken at night, and the mountain wind circulation shifts towards the dam area on the east side of the airport, resulting in an increase in vertical subsidence movements. Numerical simulation results confirm that under the action of solar radiation heating, the prevailing southwest air flow increases in the Hengduan Mountains during daytime, and passes over the Delong Mountain in the afternoon, making the surface wind of the airport into a consistent southwest wind. The surface wind speed of the airport exceeds 5.0 m·s-1, and it strengthens in the valley area on the east side of the airport under the action of the cross-mountain air flow. The convergence of valley winds and downslope flow leads to vertical updrafts, which increases the vertical instability of the lower atmosphere in the dam area on the east side of the airport. The phenomenon results in a downwind shear layer, which leads to aircraft turbulence. |
| format | Article |
| id | doaj-art-2660a53b27554e2b87896741d78cc075 |
| institution | Kabale University |
| issn | 1001-7313 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Editorial Office of Journal of Applied Meteorological Science |
| record_format | Article |
| series | 应用气象学报 |
| spelling | doaj-art-2660a53b27554e2b87896741d78cc0752025-01-25T00:42:48ZengEditorial Office of Journal of Applied Meteorological Science应用气象学报1001-73132025-01-01361778910.11898/1001-7313.20250108yyqxxb-36-1-77Diagnosis and Numerical Simulation of Low-level Wind Shear over the Hengduan Mountains in WinterRen Juzhang0Yang Xue1Tao Yun2Fu Zhijia3Chen Yan4Zhong Yahan5Wang Man6Jin Yan7Yunnan Institute of Meteorological Sciences, Kunming 650034Cangyuan Washan Airport of Yunnan Airport Group Co., LTD., Lincang 677400Yunnan Institute of Meteorological Sciences, Kunming 650034Dali National Climate Observatory, Dali 671003Yunnan Institute of Meteorological Sciences, Kunming 650034Yunnan Institute of Meteorological Sciences, Kunming 650034Yunnan Institute of Meteorological Sciences, Kunming 650034Yunnan Climate Center, Kunming 650034Cangyuan Washan Airport, located at Delong Mountain in the Hengduan Mountains, is prone to low level wind shear during takeoff and landing in winter, which is of great harm to aviation safety, and aviation departments attach great importance to it. It is also a key problem in refined weather forecasting and early warning under complex terrain. Therefore, it is essential to examine changes in low-level wind circulation around the airport. Using NCEP/NCAR reanalysis data, airport weather station data, encrypted automatic weather station data and wind profile radar data, a low-level wind shear turn-around event at Cangyuan Wushan Airport on 29 December 2021, is diagnosed and analyzed by statistical and numerical simulation methods. Results indicate that during winter, the southwest airflow prevails in the Hengduan Mountains, and the surface wind speed is relatively low. The small-scale local valley wind circulation in the east of Cangyuan Washan Airport is obvious. During daytime, the prevailing valley wind blows from the valley toward the airport. At night, the mountain wind blows from the airport back to the valley. Additionally, a vertical downdraft predominates in the approach area. However, there is a consistent southwest breeze in the afternoon. When the wind speed increases to more than 5.0 m·s-1, the prevailing southwest wind will cross the mountain, and the cross-mountain air on the ground will converge with the increased valley wind in the approach area, resulting in instantaneous vertical upward movement and forming low-level wind shear. The rapid fluctuations in wind direction and speed near the ground in the dam area on the east side of the airport significantly affects aviation safety. With the weakening of the solar radiation, the prevailing wind and valley wind begins to weaken at night, and the mountain wind circulation shifts towards the dam area on the east side of the airport, resulting in an increase in vertical subsidence movements. Numerical simulation results confirm that under the action of solar radiation heating, the prevailing southwest air flow increases in the Hengduan Mountains during daytime, and passes over the Delong Mountain in the afternoon, making the surface wind of the airport into a consistent southwest wind. The surface wind speed of the airport exceeds 5.0 m·s-1, and it strengthens in the valley area on the east side of the airport under the action of the cross-mountain air flow. The convergence of valley winds and downslope flow leads to vertical updrafts, which increases the vertical instability of the lower atmosphere in the dam area on the east side of the airport. The phenomenon results in a downwind shear layer, which leads to aircraft turbulence.http://qikan.camscma.cn/en/article/doi/10.11898/1001-7313.20250108low-level wind shearflow over terrainvalley wind circulationnumerical simulation |
| spellingShingle | Ren Juzhang Yang Xue Tao Yun Fu Zhijia Chen Yan Zhong Yahan Wang Man Jin Yan Diagnosis and Numerical Simulation of Low-level Wind Shear over the Hengduan Mountains in Winter 应用气象学报 low-level wind shear flow over terrain valley wind circulation numerical simulation |
| title | Diagnosis and Numerical Simulation of Low-level Wind Shear over the Hengduan Mountains in Winter |
| title_full | Diagnosis and Numerical Simulation of Low-level Wind Shear over the Hengduan Mountains in Winter |
| title_fullStr | Diagnosis and Numerical Simulation of Low-level Wind Shear over the Hengduan Mountains in Winter |
| title_full_unstemmed | Diagnosis and Numerical Simulation of Low-level Wind Shear over the Hengduan Mountains in Winter |
| title_short | Diagnosis and Numerical Simulation of Low-level Wind Shear over the Hengduan Mountains in Winter |
| title_sort | diagnosis and numerical simulation of low level wind shear over the hengduan mountains in winter |
| topic | low-level wind shear flow over terrain valley wind circulation numerical simulation |
| url | http://qikan.camscma.cn/en/article/doi/10.11898/1001-7313.20250108 |
| work_keys_str_mv | AT renjuzhang diagnosisandnumericalsimulationoflowlevelwindshearoverthehengduanmountainsinwinter AT yangxue diagnosisandnumericalsimulationoflowlevelwindshearoverthehengduanmountainsinwinter AT taoyun diagnosisandnumericalsimulationoflowlevelwindshearoverthehengduanmountainsinwinter AT fuzhijia diagnosisandnumericalsimulationoflowlevelwindshearoverthehengduanmountainsinwinter AT chenyan diagnosisandnumericalsimulationoflowlevelwindshearoverthehengduanmountainsinwinter AT zhongyahan diagnosisandnumericalsimulationoflowlevelwindshearoverthehengduanmountainsinwinter AT wangman diagnosisandnumericalsimulationoflowlevelwindshearoverthehengduanmountainsinwinter AT jinyan diagnosisandnumericalsimulationoflowlevelwindshearoverthehengduanmountainsinwinter |