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Observation of a tropopause fold by MARA VHF wind-profiler radar and ozonesonde at Wasa, Antarctica: comparison with ECMWF analysis and a WRF model simulation
2012 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 30, no 9, 1411-1421 p.Article in journal (Refereed) Published
Abstract [en]

Tropopause folds are one of the mechanisms of stratosphere-troposphere exchange, which can bring ozone rich stratospheric air to low altitudes in the extra-tropical regions. They have been widely studied at northern mid- or high latitudes, but so far almost no studies have been made at mid- or high southern latitudes. The Moveable Atmospheric Radar for Antarctica (MARA), a 54.5 MHz wind-profiler radar, has operated at the Swedish summer station Wasa, Antarctica (73A degrees S, 13.5A degrees W) during austral summer seasons from 2007 to 2011 and has observed on several occasions signatures similar to those caused by tropopause folds at comparable Arctic latitudes. Here a case study is presented of one of these events when an ozonesonde successfully sampled the fold. Analysis from European Center for Medium Range Weather Forecasting (ECMWF) is used to study the circumstances surrounding the event, and as boundary conditions for a mesoscale simulation using the Weather Research and Forecasting (WRF) model. The fold is well resolved by the WRF simulation, and occurs on the poleward side of the polar jet stream. However, MARA resolves fine-scale layering associated with the fold better than the WRF simulation.

Place, publisher, year, edition, pages
2012. Vol. 30, no 9, 1411-1421 p.
Keyword [en]
Meteorology and atmospheric dynamics; Mesoscale meteorology; Polar meteorology; Instruments and techniques; MARA; SWEDARP 2006/07; SWEDARP 2007/08; SWEDARP 2008/09; SWEDARP 2009/10; SWEDARP 2010/11
Research subject
SWEDARP 2006/07, MARA 2006/07; SWEDARP 2007/08, MARA 2007/08; SWEDARP 2009/10, MARA 2009/10; SWEDARP 2010/11, MARA 2010/11
URN: urn:nbn:se:polar:diva-1878DOI: 10.5194/angeo-30-1411-2012OAI: diva2:792085
Available from: 2015-03-03 Created: 2015-03-02 Last updated: 2015-06-03

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