Impact of North Atlantic evaporation hot spots on southern Alpine heavy precipitation events

摘要

This study investigates transient events of intense ocean evaporation with an amplitude exceeding 250 W m~2, a duration of a few days, and a spatial extent of about 106 km2 over the eastern North Atlantic (referred to as 'evaporation hot spots') and their impact on southern Alpine heavy precipitation. First, moisture sources for a heavy precipitation event in the Piedmont in November 2002 are studied using a water-tagging simulation with a regional model. The results reveal three main moisture source