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Modulation of Saharan dust export by the North African dipole
Título : Modulation of Saharan dust export by the North African dipole
Autor : Rodríguez González, Sergio ORCID RESEARCHERID Cuevas Agulló, Emilio ORCID RESEARCHERID SCOPUSID Prospero, Joseph M.Alastuey, AndrésQuerol, XavierLópez-Solano, Javier ORCID RESEARCHERID García Álvarez, María IsabelAlonso-Pérez, Silvia
Palabras clave : Variabilidad climática; Distribución de partículas de polvo; Climate variability; Distribution of dust
Fecha de publicación : 2015
Editor: European Geosciences Union
Citación : Atmospheric Chemistry and Physics. 2015, 15(13), p. 7471-7486
Versión del editor: https://dx.doi.org/10.5194/acp-15-7471-2015
Resumen : We have studied the relationship between the long-term interannual variability in large-scale meteorology in western North Africa – the largest and most active dust source worldwide – and Saharan dust export in summer, when enhanced dust mobilization in the hyper-arid Sahara results in maximum dust impacts throughout the North Atlantic. We address this issue by analyzing 28 years (1987–2014) of summer averaged dust concentrations at the high-altitude Izaña observatory (~ 2400 m a.s.l.) on Tenerife, and satellite and meteorological reanalysis data. The summer meteorological scenario in North Africa (aloft 850 hPa) is characterized by a high over the the subtropical Sahara and a low over the tropics linked to the monsoon. We measured the variability of this high–low dipole-like pattern in terms of the North African dipole intensity (NAFDI): the difference of geopotential height anomalies averaged over the subtropics (30–32° N, Morocco) and the tropics (10–13° N, Bamako region) close to the Atlantic coast (at 5–8° W). We focused on the 700 hPa standard level due to dust export off the coast of North Africa tending to occur between 1 and 5 km a.s.l. Variability in the NAFDI is associated with displacements of the North African anticyclone over the Sahara and this has implications for wind and dust export.
Patrocinador: The Izaña GAW program is funded by AEMET and by the Minister of Economy and Competitiveness of Spain (POLLINDUST, CGL2011-26259). J. M. Prospero’s research is supported by NSF grant AGS-0962256.
URI : http://hdl.handle.net/20.500.11765/507
ISSN : 1680-7316
1680-7324
Colecciones: Artículos científicos 2015-2018


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