Abstract The climate of the Coquimbo Region, north-central Chile is driven by atmospheric, oceani... more Abstract The climate of the Coquimbo Region, north-central Chile is driven by atmospheric, oceanic and orographic factors. The southeast Pacific anticyclone, the cold Humboldt Current and the rugged topography that characterize the zone, determine thermally induced wind regimes and the formation of low stratocumulus along the coastline. Low precipitation and high solar radiation cause important climatic altitudinal gradients, especially on temperature and humidity, thus different climatic areas can be identified in the region. We summarized the general climatic characteristics of the study area and analyzed meteorological data to understand the behavior of the environmental variables. We used mesoscale modeling to evaluate the spatial characteristics of the mean air temperature, humidity and wind. These atmospheric variables present a strong elevation gradient. The particular topographic characteristics of the region favor the development of a thermally induced wind regime, where land and sea breezes and valley winds are observed.
The boundary layer of the Elqui valley in the arid north of Chile exhibits several interesting ph... more The boundary layer of the Elqui valley in the arid north of Chile exhibits several interesting phenomena, such as a very shallow convective boundary layer (CBL) during the day. In the morning, warming is observed in and above the CBL, while the humidity decreases in the CBL. At midday, in and above the CBL of the valley, the temperature stagnates. In the afternoon in the CBL the temperature decreases and humidity increases, although the latent heat flux is very low. Because the characteristic features of the valley atmosphere are hard to interpret from observations alone, model simulations were applied. The simulations indicate that all components of the budget equations, i.e. the turbulent flux divergences, advection via the sea breeze, the upvalley and upslope wind systems, as well as subsidence, contribute to the evolution of the valley atmosphere.
... LUIS LETELIER, FRANCISCO A. SQUEO, GINA ARANCIO, ALICIA MARTICORENA, MÉLICA MUÑOZ-SCHICK, MAR... more ... LUIS LETELIER, FRANCISCO A. SQUEO, GINA ARANCIO, ALICIA MARTICORENA, MÉLICA MUÑOZ-SCHICK, MARY TK ARROYO, PEDRO LEÓN-LOBOS, SONIA MONTECINOS ... 2007) y el algoritmo: Genetic Algorithm for Rule-Set Prediction (GARP, Stockwell & Peters 1999 ...
The goal of this article is to show simple, analytical solutions of the general dispersion equati... more The goal of this article is to show simple, analytical solutions of the general dispersion equation for an homogeneous plane source, parallel to the surface of the earth. At a first step, we construct a one-dimensional model, where a perfect vertical mixture is assumed (PVMM). At a second step, vertical diffusion is added to the problem (GM). Both models predict that the concentration increases downwind and, due to deposition, it remains bounded. In order to analyze the validity of the models, the space distribution of particulate matter PM10 in the saturated zone Temuco-Padre Las Casas, Chile (38.77o S, 72.63o W) is analyzed and compared with the prediction of the models.
Abstract The climate of the Coquimbo Region, north-central Chile is driven by atmospheric, oceani... more Abstract The climate of the Coquimbo Region, north-central Chile is driven by atmospheric, oceanic and orographic factors. The southeast Pacific anticyclone, the cold Humboldt Current and the rugged topography that characterize the zone, determine thermally induced wind regimes and the formation of low stratocumulus along the coastline. Low precipitation and high solar radiation cause important climatic altitudinal gradients, especially on temperature and humidity, thus different climatic areas can be identified in the region. We summarized the general climatic characteristics of the study area and analyzed meteorological data to understand the behavior of the environmental variables. We used mesoscale modeling to evaluate the spatial characteristics of the mean air temperature, humidity and wind. These atmospheric variables present a strong elevation gradient. The particular topographic characteristics of the region favor the development of a thermally induced wind regime, where land and sea breezes and valley winds are observed.
The boundary layer of the Elqui valley in the arid north of Chile exhibits several interesting ph... more The boundary layer of the Elqui valley in the arid north of Chile exhibits several interesting phenomena, such as a very shallow convective boundary layer (CBL) during the day. In the morning, warming is observed in and above the CBL, while the humidity decreases in the CBL. At midday, in and above the CBL of the valley, the temperature stagnates. In the afternoon in the CBL the temperature decreases and humidity increases, although the latent heat flux is very low. Because the characteristic features of the valley atmosphere are hard to interpret from observations alone, model simulations were applied. The simulations indicate that all components of the budget equations, i.e. the turbulent flux divergences, advection via the sea breeze, the upvalley and upslope wind systems, as well as subsidence, contribute to the evolution of the valley atmosphere.
... LUIS LETELIER, FRANCISCO A. SQUEO, GINA ARANCIO, ALICIA MARTICORENA, MÉLICA MUÑOZ-SCHICK, MAR... more ... LUIS LETELIER, FRANCISCO A. SQUEO, GINA ARANCIO, ALICIA MARTICORENA, MÉLICA MUÑOZ-SCHICK, MARY TK ARROYO, PEDRO LEÓN-LOBOS, SONIA MONTECINOS ... 2007) y el algoritmo: Genetic Algorithm for Rule-Set Prediction (GARP, Stockwell & Peters 1999 ...
The goal of this article is to show simple, analytical solutions of the general dispersion equati... more The goal of this article is to show simple, analytical solutions of the general dispersion equation for an homogeneous plane source, parallel to the surface of the earth. At a first step, we construct a one-dimensional model, where a perfect vertical mixture is assumed (PVMM). At a second step, vertical diffusion is added to the problem (GM). Both models predict that the concentration increases downwind and, due to deposition, it remains bounded. In order to analyze the validity of the models, the space distribution of particulate matter PM10 in the saturated zone Temuco-Padre Las Casas, Chile (38.77o S, 72.63o W) is analyzed and compared with the prediction of the models.
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