2020-08-012024-05-13https://scholars.lib.ntu.edu.tw/handle/123456789/653565This study proposes to investigate the climate characteristics of convection cross-scale interactions over SCS-MC. We will focus on the diurnal variation and organization of coastal convection, including the controlling physical processes, their sensitivity to large-scale environment, and the cross-scale interactions with intraseasonal variability and seasonal transition. Convection over the South China Sea and the Maritime Continent (SCS-MC) region is characterized by strong cross-scale interaction and can have impacts on the global weather and climate. Significant bias still exist in conventional global climate models (GCMs) in their representation of tropical convection from diurnal to intraseasonal and seasonal time scales. Climate simulations will be carried out with the convection-permitting Super-Parameterized Community Atmospheric Model (SPCAM): (1) Sensitivity experiments on parameters controlling the convection organization in the subgrid 2D cloud resolving model; (2) Sensitivity experiments with different coupling frequency or prescribing the sea-surface temperature (SST) with different spatial variance to understand the impact of SST variance to convection aggregation. (3) Hindcast experiments on selected cases of intraseasonal variability or summer monsoon onset to understand the influence of the coastal organized convection and land convection on local moisture build-up during the large-scale transition period. The SPCAM simulations will compared to the idealized cloud resolving simulations with land-ocean configuration, the satellite-derived climate characteristics of convection, and also with the ground measurements taken during the intensive field campaign of SCSTIMX and YMC, to explore the responses of convection structure to ambient conditions and the cloud-convection-radiation-SST feedback. The expected outcomes will lead to more thorough scientific understandings of tropical organized convection. By combining satellite retrievals, intensive observations, and cloud-permitting simulations, the capability to evaluate and improve the representation of moist processes in current GCMs will be established.Convection Diurnal Cycle; Convection Cross-scale interaction; Monsoon Onset; Intraseasonal Variability; Global Climate Model