![]() ![]() The altitude profiles of particulate extinction in the upper troposphere and lower stratosphere (UTLS) obtained from SAGE-II in the latitude region 0–30°N over the Indian longitude sector (70–90☎) are used to study the latitudinal variation of its annual pattern in this region during the volcanically quiescent period of 1998–2003. 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 ![]() The tropical tropopause is coldest and driest between November and February, coinciding with the greatest upwelling over the tropical warm pool. The influx of tropospheric air entering the TTL (11–12 km) is similar for all tropical regions with most convection stopping below ~14 km. In the model, deep convective elevators rapidly lift air from 4–5 km up to 12–14 km. The modelled horizontal structure of organised convection is shown to match closely with signatures found in the OLR satellite data. We focus on the potential for rapid transport of short-lived ozone depleting species to the stratosphere by rapid convective uplift. 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). ![]()
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March 2023
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