The impact of stratospheric aerosol heating on the frozen hydrometeor transport pathways in the tropical tropopause layer
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Date
2024-04
Publication Type
Journal Article
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Abstract
The exceptionally low temperature in the tropical tropopause layer (TTL) restricts the amount of water vapor entering the stratosphere. However, moisture may also enter the stratosphere in its frozen state, and the amount thereof depends on hydrometeor sedimentation and air vertical velocity. We investigate the sensitivity of frozen hydrometeor transport pathways to substantial perturbations of the TTL temperature structure in global storm-resolving model simulations. A special focus is laid on the question which process—convection, slow upwelling within the background velocity field, in-cloud radiative processes, gravity waves or turbulence—is responsible for most of the transport. The study shows that the main contribution to the frozen hydrometeor flux is cold-point overshooting convection in both the control and perturbed scenario. The average convective event transports an increased amount of frozen hydrometeors at the cold-point tropopause, when the later is warmed. This finding can be explained by scaling of frozen moisture content with Clausius Clapeyron in a saturated environment.
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published
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Journal / series
Volume
19 (4)
Pages / Article No.
44039
Publisher
IOP Publishing
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Subject
Stratospheric moisture budget; Deep convection; Heating perturbation; Tropical tropopause layer; Volcano; Geoengineering
Organisational unit
09770 - Jnglin Wills, Robert Christopher / Jnglin Wills, Robert Christopher
ETH Zürich
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Is supplemented by: https://hdl.handle.net/21.11116/0000-000D-F723-5