大气科学2025，Vol.49Issue(3)：752-766,15.DOI:10.3878/j.issn.1006-9895.2310.23073
非典型对流台风快速增强机制:地表潜热通量作用
Rapid Intensification of Typhoon with Atypical Convection:The Role of Surface Latent Heat Flux
摘要
Abstract
In this study,RI(rapid intensification)tropical cyclones with atypical convection(upshear concentrated convection)in the Northwest Pacific were screened using reanalysis data and infrared cloud images.A group of slow intensification(noRI)typhoons with typical convection(downshear concentrated convection)was gathered for comparison.The RI group has a stronger center of surface latent heat flux on the left side of the VWS(vertical wind shear)direction.To further explore possible mechanisms,the atypical convection case Lekima was selected for sensitivity numerical experiments.Diagnostic results indicate that surface latent heat flux on the left side of the VWS direction helps establish convective instability in the region.Consequently,the influence of the"ventilation effect"is weakened because of the"boundary layer entropy recovery"mechanism caused by surface latent heat flux.Under easterly VWS,convection activity can be enhanced in regions with high surface latent heat flux during the transition from downshear to upshear,thereby stimulating strong upper outflow channels.The establishment of outflow channels(outflow blocking mechanism)can resist environmental easterly flow,weakening the strength of VWS and allowing typhoons to develop vertically.关键词
热带气旋/快速增强/高层切变/出流/地表潜热通量Key words
Tropical cyclone/Rapid intensification/Upper vertical shear/Outflow/Surface latent heat flux分类
天文与地球科学引用本文复制引用
沈上骐,黄绮君,葛旭阳..非典型对流台风快速增强机制:地表潜热通量作用[J].大气科学,2025,49(3):752-766,15.基金项目
国家自然科学基金项目U2342202、42175003,上海台风基金项目TFJJ202402,上海市协同创新专项资金(创新协调)项目CXXT-2023-06 National Natural Science Foundation of China(Grants U2342202,42175003),Shanghai Typhoon Research Fundation(Grant TFJJ202402),Project of Shanghai Collaborative Innovation Special Fund(Innovation Coordination)(Grant CXXT-2023-06) （创新协调）
