Journal article
The impact of overshooting deep convection on local transport and mixing in the tropical upper troposphere/lower stratosphere (UTLS)
W Frey, R Schofield, P Hoor, D Kunkel, F Ravegnani, A Ulanovsky, S Viciani, F D'Amato, TP Lane
Atmospheric Chemistry and Physics | Published : 2015
Abstract
In this study we examine the simulated downward transport and mixing of stratospheric air into the upper tropical troposphere as observed on a research flight during the SCOUT-O3 campaign in connection with a deep convective system. We use the Advanced Research Weather and Research Forecasting (WRF-ARW) model with a horizontal resolution of 333 m to examine this downward transport. The simulation reproduces the deep convective system, its timing and overshooting altitudes reasonably well compared to radar and aircraft observations. Passive tracers initialised at pre-storm times indicate the downward transport of air from the stratosphere to the upper troposphere as well as upward transport f..
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Funding Acknowledgements
W. Frey is supported by the DFG Research Fellowship "Tropical High Altitude Clouds and their Impact on Stratospheric Humidity" (FR 3325/1-1). The work was supported by the ARC Centre of Excellence for Climate System Science (CE110001028). This research was undertaken with the assistance of resources from the National Computational Infrastructure (NCI), which is supported by the Australian Government. We greatly acknowledge the ECMWF for providing meteorological data and G. Vaughan is acknowledged for providing the ACTIVE ozonesonde data. For helpful discussion we thank M. von Hobe from the research centre in Julich, Germany. Special thanks to the entire Geophysica crew and the local authorities in Darwin for their excellent collaboration during the campaign. The SCOUT-O3 project was funded by the European Commission (GOCE-CT-2004-505390).