Propagation and effects of a mesoscale gravity wave over a weakly-stratified nocturnal boundary layer during the SABLES2006 Field Campaign

This research has been funded by the Spanish Ministry of Education and Science (projects CGL2004-03109 and CGL2006-12474-C03-03). IV PRICIT program (supported by CM and UCM) has also partially financed this work through the Research Group ”Micrometeorology and Climate Variability” (n◦ 910437)

Génesis y evolución de un arrabal sevillano: la cestería

En el presente artículo pretendemos reconstruir la génesis y evolución del arrabal sevillano de la Cestería, emplazado en las proximidades de la Puerta de Triana (fig. 1), desde su fundación en los siglos XIV-XV hasta la actualidad. Para ello utilizaremos los datos que proporcionaron las intervenciones arqueológicas de urgencia en Reyes Católicos n° 3/Almansa n°6 y Almansa n° 5 (Jiménez Maqueda y Mosulén 1997 y 1998).In this article we try to rebuild the genesis and evolution of the Sevillian suburb, the Cestería, settled near the Triana Gate (fig. 1), since its foundation in the centuries XIV-XV. To do so, we will use the data provided by the urgent archaeological interventions in Reyes Católicos n° 3/Almansa n° 6 y Almansa n° 5 (Jiménez Maqueda and Mosulén 1997 and 1998)

Study of the morning transition of the atmospheric boundary layer

Póster presentado en: European Geosciences Union General Assembly celebrado del 19-24 de abril de 2009 en Viena.This research has been funded by the Spanish Ministry of Education and Science (projects CGL2004-03109 and CGL2006-12474-C03-03. IV PRICIT program (supported by CM and UCM) has also partially financed this work through the Research Group “Micrometeorology and Climate Variability” (nº 910437)

Influence of atmospheric stratification on the integral scale and fractal dimension of turbulent flows

In this work the relation between integral scale and fractal dimension and the type of stratification in fully developed turbulence is analyzed. The integral scale corresponds to that in which energy from larger scales is incoming into a turbulent regime. One of the aims of this study is the understanding of the relation between the integral scale and the bulk Richardson number, which is one of the most widely used indicators of stability close to the ground in atmospheric studies. This parameter will allow us to verify the influence of the degree of stratification over the integral scale of the turbulent flows in the atmospheric boundary layer (ABL). The influence of the diurnal and night cycles on the relationship between the fractal dimension and integral scale is also analyzed. The fractal dimension of wind components is a turbulent flow characteristic, as has been shown in previous works, where its relation to stability was highlighted. Fractal dimension and integral scale of the horizontal (u′) and vertical (w′) velocity fluctuations have been calculated using the mean wind direction as a framework. The scales are obtained using sonic anemometer data from three elevations 5.8, 13 and 32 m above the ground measured during the SABLES 98 field campaign (Cuxart et al., 2000). In order to estimate the integral scales, a method that combines the normalized autocorrelation function and the best Gaussian fit (R² ≥ 0.70) has been developed. Finally, by comparing, at the same height, the scales of u′ and w′ velocity components, it is found that the turbulent flows are almost always anisotropic

Analysis of the different regimes of atmospheric turbulence observed during a single night

This work presents a comprehensive study of the different turbulence regimes observed during a night (27-28 June 2006) at the CIBA (Research Centre for the Lower Atmosphere), located in the northern part of the Iberian Peninsula, in the Duero valley, over relatively flat and homogeneous terrain. The synoptic situation was dominated by an Atlantic anticyclone, with a weak northern flow over the área of interest. Nevertheless, the actual meteorological evolution was mainly driven by the mesoscale conditions. The meteorological sequence of events were the irruption of a drainage flow, part of a nocturnal circulation established over the whole basin, and finally, the onset of a thick and dense fog layer that covered the region during several hours. These facts produced sudden changes both in the turbulence regime and in the stability of the lowest layers of the atmosphere, so that, three periods, with moderately stable, weakly stable and neutral stratification can be perfectly distinguished. The study includes the analysis of different observational datasets, gathered during the SABLES-2006 field campaign, especially designed to improve the knowledge on the nocturnal boundary layer.This research has been funded by the Spanish Ministry of Education and Science (projects CGL2004-03109 and CGL2006-12474-C03-03). IV PRICIT program (supported by CM and UCM) has also partially financed this work through the Research Group ”Micrometeorology and Climate Variability” (n 910437)

Estudio de nubes convectivas ligadas a un sistema frontal con imágenes IR

En este trabajo se ha realizado un estudio de las propiedades de las nubes a diferentes niveles dentro de un frente, por medio de imágenes de Meteosat, utilizando, la banda de infrarrojo térmico (IR). Para ello, se definen umbrales apropiados de Temperatura de Brillo (TB) que permiten delimitar el área correspondiente a nubes de distinto origen. Por una parte, el área extensa con temperatura de brillo inferior a 248 K, que se identifica como frente, y por otra, el área de temperatura inferior a 221 K asociado a nubes de desarrollo vertical. Los centros de las nubes convectivas obtenidos de la posición geográfica de los centros de gravedad, presentan un notable alineamiento que ha sido caracterizado mediante regresión lineal. Se compara el alineamiento de los cúmulos con la orientación del propio frente, según la dirección principal del mismo. Esto permite desarrollar una metodología en el análisis comparativo de estructuras nubosas de diferentes orígenes, así como la mejora en el conocimiento de sus propiedades y evolución en el desplazamiento de los sistemas sinópticos, relativo a los paralelos geográficos

Estudio de las Fluctuaciones de Presión Superficial Generadas por Ondas y Turbulencia en la Capa Límite Atmosférica Nocturna durante la Campaña SABLES2006

[EN]Small-scale, short-period surface pressure fluctuations are perhaps one of the less studied features in the atmospheric boundary layer (ABL). These perturbations can be produced by fast turbulent motions and also by the propagation of internal-gravity waves generated close to the ground when stability is present. In this work nocturnal data from SABLES2006 field campaign is analyzed in order to characterize the wave-like structures detected during the most stable periods of the campaign by means of a wavelet analysis. In addition, we will relate the spectral characteristics of surface pressure fluctuations to the turbulent and stability parameters measured from tower data.[ES]Las fluctuaciones de presión de período corto o pequeña escala son, quizá, de los aspectos menos estudiados en la capa límite atmosférica (ABL). Estas perturbaciones se producen por rápidos movimientos turbulentos y por la propagación de ondas internas generadas cerca del suelo en presencia de estabilidad. En este trabajo se han analizado datos nocturnos obtenidos en la campaña de campo SABLES2006, con objeto de caracterizar, por medio de un análisis de tranformada wavelet, los eventos detectados con estructuras ondulatorias durante los períodos de mayor estabilidad de la campaña. También se relacionarán las características espectrales de las fluctuaciones de la presión en superficie con los parámetros turbulentos y de estabilidad obtenidos de los datos de una torre meteorológica.This research has been funded by the Spanish Ministry of Education and Science (projects CGL2004-03109 and CGL2006-C03-03). IV PRICIT program (supported by CM and UCM) has also partially financed this work through the Research Group “Micrometeorology and Climate Variability” (nº 910437)

Study of cross-spectra of velocity components and temperature series in a nocturnal boundary layer

Póster presentado en: European Geosciences Union General Assembly celebrada del 2 al 7 de mayo de 2010 en Viena.This research has been funded by the Spanish Ministry of Science and Innovation (projects CGL 2006-12474-C03-03 and CGL2009-12797-C03-03). GR58/08 program (supported by BSCH and UCM) has also partially financed this work through the Research Group “Micrometeorology and Climate Variability” (nº 910437)

Estudio de la precipitación convectiva en diferentes zonas climáticas de España

Presentación realizada para las XXXII Jornadas Científicas de la Asociación Meteorológica Española y 13º Encuentro Hispano-Luso de Meteorología celebrados en Alcobendas (Madrid), del 28 al 30 de mayo de 2012