Relative contribution of local and remote sources of moisture to East Asian monsoon precipitation in CMIP6 simulations

The East Asian monsoon is one of the most important features in the global climate system. Understanding the variation and moisture sources of East Asian monsoon precipitation is crucial for improving land-atmosphere interactions, developing more accurate global climate models, and optimizing the region’s water management strategies. Monsoon precipitation is produced from both local moisture through evapotranspiration and remote moisture transported from oceans via large-scale circulation. This study investigates the relative contribution of local and remote moisture sources to total monsoon precipitation in East China using model outputs from 12 CMIP6 simulations. Simulations from the historical experiments of CMIP6 are selected for the period of 1950-2014. These 12 CMIP6 models are selected based on the availability of data related to convective precipitation and soil moisture. In this study, we focus on the percentage of convective precipitation in total monsoon precipitation and soil moisture-precipitation relationship in East China. East China is divided into five regions based on their climate conditions. Our analysis suggests a significant spatial and temporal variation in the contribution of local convective precipitation to overall monsoon precipitation among different models. On average, the Southeast region shows a higher percentage of convective precipitation and a stronger soil moisture-precipitation correlation than other regions. Additionally, the percentage of convective precipitation varies significantly between models. The findings from this analysis could offer insights for enhancing the development of future climate models.