Vertical Velocity Characteristics of Hurricanes Based on Dropsondes Data
SUN Yao
LI Yubin
TANG Jie
GAO Zhiqiu
YIN Jian
WU Yujie
Abstract：Based on observational data collected by dropsondes,this paper analyzed the distribution characteristics of hurricanes'vertical velocity in the lower atmospheric layer(within 3 km of the ground).The results show that smaller vertical velocity(<2 m·s-1)exhibited no significant difference in distribution with height in the near-center region(R/RMW≤5,where Rrepresents the distance between the dropsonde and the center of the hurricane,and RMW denotes the maximum wind speed radius of the hurricane),the far-center region(5≤R/RMW<10)and outside-hurricane region(R/RMW≥10).However,the frequency of positive values of larger vertical velocity(≥2 m·s-1)in the near-center region was the highest,significantly exceeding that in the far-center and outside-hurricane regions.Conversely,the frequency of negative values in the outside-hurricane region was the highest,significantly exceeding that in the near-center and far-center regions.In the near-center region of hurricanes,the frequency of updrafts decreased with the increase in height,while the frequency of downdrafts increased.In the far-center and outside-hurricane regions,the intensity and proportion of vertical velocity did not change obviously with height.The intensity and proportion of updrafts in the near-center region increased with hurricane intensity,while the median velocity and proportion of vertical velocity in the far-center and outside-hurricane regions showed little change with hurricane intensity.Moreover,it is found that the updrafts in hurricanes can exceed 10 m·s-1,usually in the normalized radius of 1-2.5,and the maximum wind speed of the hurricane should reach 50 m·s-1.
Keywords：hurricanedropsondes datavertical velocitynormalized radiuslower atmospheric layer
Publication Date：2024-10-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 859-868 )