A Spectrum of Convective Self‐Aggregation Based on Background Rotation
A Spectrum of Convective Self‐Aggregation Based on Background Rotation
复制标题
DOI：
10.1029/2021ms002860
复制
发表时间：
2022-05
影响因子：
6.8
通讯作者：
Jacob D. Carstens;A. Wing
中科院分区：
文献类型：
--
作者：
Jacob D. Carstens;A. Wing
高分辨率的建模揭示了从辐射传染的等效对话中对赞助者提供的自我聚集的趋势自我聚集（SA）及其引起的机制的相对作用可能会随着环境旋转的变化而经历等级的转移。使用与0.1°和20°之间的纬度相对应的31个云解分解模拟，跨越了一系列弱旋转的环境，在先前的文献中很大程度上出乎意料。 –5°）的特征是几个干斑的生长。最终，转换的形式是非旋转带或准圆形簇的形式。 TC进行TC。 100天的模拟。 TC创世纪。
High‐resolution modeling reveals a tendency for deep convection to spontaneously self‐aggregate from radiative‐convective equilibrium. Self‐aggregated convection takes different forms in nonrotating versus rotating environments, including tropical cyclones (TCs) in the latter. This suggests that self‐aggregation (SA), and the relative roles of the mechanisms that cause it, may undergo a gradual regime shift as the ambient rotation changes. We address this hypothesis using 31 cloud‐resolving model simulations on f‐planes corresponding to latitudes between 0.1° and 20°, spanning a range of weakly rotating environments largely unexplored in prior literature. Simulations are classified into three groups. The first (low‐f, 0.1°–5°) is characterized by the growth of several dry patches. Surface enthalpy flux feedbacks dominate in this initial growth phase, followed by radiative (primarily cloud longwave) effects. Eventually, convection takes the form of either a nonrotating band or a quasi‐circular cluster. In contrast, the 9°–20° (high‐f) group dries less rapidly in early stages, though enhanced surface flux effects form a moist anomaly that undergoes TC genesis. The TC then acts to dry the remainder of the domain. Finally, a set of 6°–8° (medium‐f) simulations fails to fully self‐aggregate, producing convection across most of the domain through the full 100‐day simulation. The combination of relatively weak diabatic feedbacks and a negative advective feedback prevents SA from completing in this group. The advective feedback becomes more negative with increasing rotation, but high‐f simulations compensate by having sufficiently strong surface flux feedbacks to support TC genesis.