Journal article

Extratropical fronts in the lower troposphere-global perspectives obtained from two automated methods

Sebastian Schemm, Irina Rudeva, Ian Simmonds

QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY | WILEY | Published : 2015

Abstract

In this study two commonly used automated methods to detect atmospheric fronts in the lower troposphere are compared in various synoptic situations. The first method is a thermal approach, relying on the gradient of equivalent potential temperature (TH), while the second method is based on temporal changes in the 10 m wind (WND). For a comprehensive objective comparison of the outputs of these methods of frontal identification, both schemes are firstly applied to an idealised strong baroclinic wave simulation in the absence of topography. Then, two case-studies (one in the Northern Hemisphere (NH) and one in the Southern Hemisphere (SH)) were conducted to contrast fronts detected by the meth..

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Funding Acknowledgements

We would like to acknowledge the work of Michael Sprenger (ETH Zurich), who implemented the spline interpolated polyline approximation for the fronts, and thank Heini Wernli (ETH Zurich) for his comments and suggestions on an earlier draft of this study. Parts of this research were made possible by a grant from the Australian Research Council. We are grateful for the constructive comments of the two anonymous referees.