Shear‐Parallel Tropical Convective Systems: Importance of Cold Pools and Wind Shear
Shear‐Parallel Tropical Convective Systems: Importance of Cold Pools and Wind Shear
复制标题
切变平行热带对流系统：冷池和风切变的重要性
DOI：
10.1029/2020gl087720
复制
发表时间：
2020
影响因子：
5.2
通讯作者：
S. C. Heever
中科院分区：
文献类型：
--
作者：
L. Grant;M. Moncrieff;T. Lane;S. C. Heever
The impact of cold pools on line‐orientated convective systems is assessed using idealized simulations of tropical oceanic convection under weak, moderate, and strong wind shear regimes. Cold pools are weakened by suppressing evaporation in the shallow subcloud layer. Analysis of objectively identified convective systems reveals that the convection with weaker cold pools is more often oriented parallel, rather than perpendicular, to the wind shear. The cold pool‐induced orientation changes are most pronounced in the strong shear environment. Interactions between convective orientation and the tropical atmosphere are assessed. Simulations with shear‐parallel convection demonstrate more top‐of‐atmosphere upwelling longwave radiation and less reflected shortwave radiation due to changes in convective anvils, faster‐propagating larger‐scale gravity waves, narrower cross‐shear moisture distributions, and differences in convective momentum fluxes. The results highlight critical interactions across convective scales, mesoscales, and climate scales, as well as avenues for parameterizing structural modes of mesoscale‐organized convection in global models.
