海气热通量和垂直风切变对强热带风暴“温比亚”(2018)影响研究

Effects of Air—sea Heat Flux and Environmental Vertical Wind Shear on Severe Tropical Storm Rumbia(2018)

利用地面加密自动气象站观测的1h降水、NCEP提供的海温、海气界面热通量以及风场等资料,分析了海温、海气界面热量交换以及环境垂直风切变对强热带风暴"温比亚"(2018)强度和降水结构的影响。结果表明:在"温比亚"生命史过程中,垂直风切变对其强度发展起到了一定的抑制作用。但是,垂直风切变不是影响其强度变化的唯一因素,"温比亚"登陆前27~29℃的高海温海域为其强度的增强提供了大量潜热。"温比亚"深入内陆期间,其降水分布具有显著的非对称结构。在环境垂直风切变的作用下,"温比亚"强降水位于顺切变方向及其左侧。

Using hourly rainfall observed by intensive automatic weather stations,sea surface tempeture(SST),air—sea heat flux and wind field supplied by NCEP,the effects of SST,air—sea heat exchange and environmental vertical wind shear(VWS)on the intensity and precipitation structure of Severe Tropical Storm Rumbia(2018)were analyzed.The results show that in some degree,the VWS restrains Rumbia’s development in its whole life.But the VWS is not a sole factor for Rumbia’s intensity variability.Before Rumbia’s landfall,the sea with SST 27~29℃supplies sufficient latent heat for Rumbia’s increasing intensity.The precipitation structure of Rumbia shows significant asymmetry when it moves inland of China.The Rumbia’s heavy rainfall generally occur downshear to downshear-left of the VWS vector.