The Sensitivity of Moisture Flux Partitioning in the Cold‐Point Tropopause to External Forcing

The dryness of the stratosphere is result air entering through cold tropical tropopause layer (TTL). However, our understanding moisture flux partitioning into water vapor and frozen hydrometeors incomplete. This raises concerns regarding ability General Circulation Models to accurately predict changes in stratospheric following perturbations radiative budget due volcanic aerosol or geoengineering. We present first results using a global storm-resolving model investigating sensitivity fluxes within TTL an additional heating source. address question how under perturbations. analysis reveals resilience TTL, keeping constant even at average cold-point warming exceeding 8 K. In control perturbed simulations, contributes around 80% stratosphere.