The Role of Convection in Troposphere-Lower Stratosphere Interactions in Radiative-Convective Equilibrium Simulations

Abstract

This study investigates interactions between the lower stratosphere and troposphere in the idealized Radiative-Convective Equilibrium (RCE) simulation using the Vector Vorticity cloud-resolving Model (VVM). We conducted a long-term RCE simulation with an elongated domain size and high resolution for two years. This allows for a comprehensive analysis of the relationship between domain-averaged zonal wind oscillations and different convective structures. The oscillation is observed to be asymmetric in the first three cycles and symmetric in the last two cycles. The differences in convection structures are found: squall-line-like convection and aggregated convection. The results show that the aggregated convection has more convective core clouds than squall-line-like convection, leading to a faster transition of QBO-like oscillation. In conclusion, this study provides new insight into the impact of different convective structures on QBO-like oscillation.