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Modelling deep convection and its impacts on the tropical tropopause layer

by J. S. Hosking, M. R. Russo, P. Braesicke, J. A. Pyle
Atmospheric Chemistry and Physics ()

Abstract

The UK Met Office's Unified Model is used at a climate resolution (N216, ~0.83~0.56, ~60 km) to assess the impact of deep tropical convection on the structure of the tropical tropopause layer (TTL). We focus on the potential for rapid transport of short-lived ozone depleting species to the stratosphere by rapid convective uplift. The modelled horizontal structure of organised convection is shown to match closely with signatures found in the OLR satellite data. In the model, deep convective elevators rapidly lift air from 45 km up to 1214 km. The influx of tropospheric air entering the TTL (1112 km) is similar for all tropical regions with most convection stopping below ~14 km. The tropical tropopause is coldest and driest between November and February, coinciding with the greatest upwelling over the tropical warm pool. As this deep convection is co-located with bromine-rich biogenic coastal emissions, this period and location could potentially be the preferential gateway for stratospheric bromine.

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