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Instituto Potosino de Investigación Científica y Tecnológica (IPICYT) 2017

Vientos de Santa Ana y tormentas de polvo en el Noroeste de México

Alvarez Baez, Christian Adrián

Titre : Vientos de Santa Ana y tormentas de polvo en el Noroeste de México

Auteur : Alvarez Baez, Christian Adrián

Université de soutenance : Instituto Potosino de Investigación Científica y Tecnológica (IPICYT)

Grade : Maestría en Geociencias Aplicadas 2017

Résumé
Santa Ana winds represent a meteorological phenomenon with great environmental impact in the northwest Mexico and southwest USA. Results of the research about Santa Ana winds from the October 2007 event are presented. This work covers aspects such as the extreme modification of meteorological variables, the formation of dust storms caused by Santa Ana winds and the present synoptic conditions. This research was conducted in four main steps. The first one consisted on the satellite images (MODIS) acquisition and analysis between the period of 2002-2016 for the selection of an event with dust emission. The sources of dust emission were then identified and correlated with their type of land use and vegetation. The Weather Research and Forecasting Model was then applied along with the chemical module (WRF-Chem). Finally, the results of the modeling of the event were visualized and interpreted. This research allowed to document the formation of defined structures of hot and dry air belonging to the Santa Ana winds. These structures were correlated with the areas with the lowest topographic height in the Baja California peninsula where the wind intensity was higher. These zones of greater wind intensity coincide with the most relevant dust emissions. This research delves into the vertical air behavior along the coast of the Baja California peninsula and southern California. Results indicate that the heating mechanism of Santa Ana winds in the Baja California peninsula consists of descending air masses from greater height. Altar Dessert and the Sonora coast are a vast source of PM10, carrying up to 9000 ug/m3 above the California Gulf. PM10 concentrations over densely populated cities as San Diego, Mexicali, Ensenada and Tijuana, are higher than allowed by the Official Mexican Standard during the Santa Ana winds in the October 2007 event.

Mots Clés : Viento Santa Ana Foehn PM10 Modelación

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Page publiée le 28 janvier 2018