基于上海风廓线雷达的台风“梅花”边界层风特征

Analysis of Boundary Layer Wind Characteristics of Typhoon Muifa Based on Wind Profile Radars in Shanghai

关键词:  台风  风廓线雷达  边界层  风场  特征

Key words:  typhoon  wind profile radars  boundary layer  wind field  characteristics analysis

摘要:

利用 4 部上海风廓线雷达实测资料，对 2022 年台风“梅花”登陆上海前后的边界层风场进行分析。结果发现，位于台风移动路径右侧的小洋山雷达站风向随时间呈顺时针方向旋转，而位于台风移动路径左侧的金山、浦东和嘉定站则呈逆时针方向旋转。台风中心过境前的风速明显大于过境后的风速。受下垫面建筑物影响，中心城区的近地层风速小于郊区，海岛近地层风速大于郊区。在城市冠层以上，中心城区、郊区和海岛的风速比较接近。

Abstract:

This study analyzes the boundary layer wind field before and after the landfall of Typhoon Muifa in 2022, utilizing real-time data from four wind profile radars in Shanghai. The analysis revealed that the Xiaoyangshan radar station, located on the right side of the typhoon's trajectory, exhibited clockwise wind direction rotation over time. In contrast, the Jinshan, Pudong, and Jiading stations, located on the left side of the typhoon's movement path, exhibited counterclockwise wind direction rotation. The windspeed before the passage of the typhoon center was significantly higher than that measured after the passage.The near-ground wind speed in the urban center was lower than that in the suburbs due to the influence of underlying buildings. However, the near-ground wind speed on islands was higher than that in the suburbs.The wind speed above the urban canopy remained relatively constant across the central urban, suburbs, and islands.