Characteristics of the Quasi‐Periodic Outbreaks of Deep Convection During Tropical Cyclone Genesis

Abstract

The formation and development of tropical cyclones (TC) are closely related to convective activities, especially deep convection. In the pre-genesis stage, deep convection warms and moistens the upper troposphere, thus facilitating the low-level convergence, driving the transverse circulation and strengthening the cyclonic circulation over a deep layer (Fang & Zhang, 2011;Smith et al., 2009;Wang, 2014b;Zhang & Zhu, 2012). By this way, the dynamic and thermodynamic fields are gradually modified (Montgomery et al., 2006;Nolan, 2007;Raymond et al., 2014), eventually leading to the formation of a TC. To some extent, TC formation is the process of development and organization of deep convection into larger scale. Therefore, convective evolution and organization have always been the primary concern of TC genesis research.In order to identify the key features of convection leading to TC formation, many studies were conducted to investigate the convective evolution during the genesis phase in the past decade (e.g.,