Page 151 - 《高原气象》2026年第1期

1 期 管 靓等：基于Q矢量分解的上海沿岸水域近海北上热带气旋大风成因分析 147
of squall lines［D］. Nanjing： Nanjing University of Information 60. Zhi J L， Huang X X， 2020. Comparion and cause analysis of
and Science Technology， 1-121. high wind processes in NO. 1713 typhoon hato and NO. 1822 ty‐
植江玲， 黄先香， 2020. 1713 号台风“天鸽” 与 1822 号台风“山竹” phoon mangkhut［J］. Mid-low Latitude Mountain Meteorology，
大风过程对比及成因分析［J］. 中低纬山地气象， 44（5）： 54- 44（5）： 54-60.

Cause Analysis of Offshore Northward Tropical Cyclone Gales in Shanghai
Coastal Areas Based on the Q Vector Partitioning Method

GUAN Liang ， YUE Caijun ， LU Wenjing ， CHEN Xi ， YAO Yao 1
1
1
2
1
（1. Shanghai Marine Meteorological Center， Shanghai 200030， China；
2. Shanghai Center for Meteorological Disaster Prevention Technology， Shanghai 200030， China）
Abstract： Based on the ageostrophic dry Q vector （Q ） partitioning method， combining with the ERA5 reanaly‐
D
sis data and the China Meteorological Administration （CMA） tropical cyclone best track data， the causes of off‐
shore northward tropical cyclone （TC） gales in the coastal areas of Shanghai from 1981 to 2022 are diagnosed
and analyzed. The results show that： （1） the stronger the wind force， the stronger the vertical upward motion，
the lower the height of the strong updraft center and the thicker the vertical upward motion layer， which means
the TC wind is closely related to the vertical motion within its circulation； （2） the range and intensity of the Q
D
vector divergence convergence area are correspond to the vertical upward motion zone during the gale process.
The vertical upward motion center coincides with the Q vector divergence convergence center. The stronger the
D
vertical updraft is， the stronger the convergence intensity of the Q vector divergence， which indicates that there
D
is a good correspondence between the vertical upward motion in the area affected by the TC gales and the conver‐
gence zone of the Q vector divergence； （3） the results of the Q vector partitioning method show that during the
D
D
period of TC gale， the convergence intensity of Q s and Q n vector divergence increases with the wind scale. For
D
D
D
D
the same wind level， the convergence intensity of the Q n vector divergence is stronger than that of the Q s vector
divergence. Furthermore， the higher the wind scale is， the more distinct the difference between the convergence
intensity of the Q n and Q s vector divergence. In details， the different convergence intensity in the scale 10 wind
D
D
region can be larger than the scale 7 wind region by two orders of magnitude， suggesting that the forcing of the
mesoscale weather system is the main cause of the TC gales. The results of this study provide valuable guidance
and have significant practical application value for the forecasting of TC gales.
Key words： ageostrophic Q vector； Shanghai coastal areas； tropical cyclone gales； cause analysis