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

C. A. Kroll, S. Fueglistaler, H. Schmidt, L. Kornblueh, C. Timmreck

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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

Original languageEnglish (US)
Article numbere2022GL102262
JournalGeophysical Research Letters
Issue number12
StatePublished - Jun 28 2023

All Science Journal Classification (ASJC) codes

  • Geophysics
  • General Earth and Planetary Sciences


  • geoengineering
  • moisture budget
  • perturbation
  • stratospheric water vapor
  • tropopause
  • volcano


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