Significant Amplification of Instantaneous Extreme Precipitation With Convective Self-Aggregation.

ABSTRACT: This work explores the effect of convective self-aggregation on extreme rainfall intensities through an analysis at several stages of the cloud lifecycle. In addition to increases in 3-hourly extremes consistent with previous studies, we find that instantaneous rainrates increase significantly (+30%). We mainly focus on instantaneous extremes and, using a recent framework, relate their increase to increased precipitation efficiency: the local increase in relative humidity drives larger accretion efficiency and lower re-evaporation. An in-depth analysis based on an adapted scaling for precipitation extremes reveals that the dynamic contribution decreases (-25%) while the thermodynamic is slightly enhanced (+5%) with convective self-aggregation, leading to lower condensation rates. When the

SUBMITTER: Da Silva NA 

PROVIDER: S-EPMC9285386 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature