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Título:	Observational and numerical simulation study of a sequence of eight atmospheric density currents in northern Spain
Autor/a:	Soler Duffour, María Rosa; Udina, Mireia; Ferreres Soler, Enriqueta
Otros autores:	Universitat Politècnica de Catalunya. Departament de Física Aplicada; Universitat Politècnica de Catalunya. DF - Dinàmica No Lineal de Fluids
Abstract:	A sequence of eight atmospheric density current fronts occurred in consecutive days are identified and analyzed using micrometeorological time series and numerical simulations. Observations were collected in the context of the INTERCLE project, which took place from September 2002 to November 2003 at the CIBA (Research Centre for the Lower Atmosphere) site located over the northern Spanish plateau. Numerical simulations used the Weather Research and Forecast (WRF) model with fine horizontal resolution (1 km). Both observations and simulations agree that the arrival of the density currents are characterized by a sharp change in temperature, wind velocity, wind direction and specific humidity and a source of intermittent turbulence. However, comparison between model and observations shows that the model predicts the intrusion of the density currents earlier than is observed. In addition, wavelet techniques applied to the data help distinguish the different scales present in the events, and therefore can reveal traces of gravity waves induced by the arrival of the density currents.
Abstract:	Peer Reviewed
Materia(s):	-Àrees temàtiques de la UPC::Física::Astronomia i astrofísica::Sistema solar -Density currents -Gravity waves -ntermittent turbulence -Nocturnal boundary layer -Numerical simulation -Wavelet transform
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Tipo de documento:	Artículo - Versión publicada Artículo
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