North American Monsoon Impacts Southern California's Coastal Low Clouds

Low-level stratiform clouds modulate California's coastal climate during the warm season. Previous work describing seasonal and daily variability of low cloudiness (CLC) suggests that in July, August, September southern CLC is under influence an additional driver, which has less impact northern California. In this work, we introduce link free-tropospheric moisture dictated by North American Monsoon (NAM) processes can California CLC. We use situ remote sensing observations, as well reanalysis single column model simulations to identify investigate previously missing component. find monsoonal advected southeasterly flow from core NAM region into reduces diminishing cloud-top longwave cooling. To add already complex brew known factors influencing cloudiness, another one hereby introduced should be accounted for future work.