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A numerical case study on footprint model performance under inhomogeneous flow conditions

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Two models for predicting near-surface flux and concentration footprints are compared concerning their performance in the presence of heterogeneous surface conditions. One of the models is a conventional Lagrangian backward model and the second an LES model with an embedded Lagrangian footprint model. The latter model reveals generation of thermally induced secondary circulation under such surface heterogeneity. The conventional Lagrangian backward model with simple parameterization of flow conditions mostly performs well in footprint predictions for concentrations and somewhat worse for fluxes, and fails only in areas where flow patterns are dominated by pronounced secondary circulations.

Zwei Modelle zur Bestimmung der bodennahen Fluss- und Konzentrationsfootprints werden hinsichtlich ihrer Leistungsfähigkeit für heterogene Unterlagenbedingungen verglichen. Das erste Modell war ein konventionelles Lagrangesches Rückwärtsmodell und das zweite ein LES Modell mit eingebetteter Lagrangescher Footprintmodellierung. Letzteres zeigt die Entstehung von thermisch induzierten Sekundärzirkulationen unter heterogenen Bedingungen. Das konventionelle Lagrangesche Rückwärtsmodell erfüllte weitgehend die Footprintbestimmung selbst mit einer einfachen Parametrisierung der Strömungsbedingungen. Es versagt lediglich in den Gebieten, die von den Sekundärzirkulationen dominiert wurden.

Document Type: Research Article


Publication date: December 1, 2010

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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