Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 7 7 2007 10.5194/acp-7-1835-2007 http://www.atmos-chem-phys.net/7/1835/2007/ http://www.atmos-chem-phys.net/7/1835/2007/acp-7-1835-2007.html http://www.atmos-chem-phys.net/7/1835/2007/acp-7-1835-2007.pdf 1835 1849 2007-04-16 Mesoscale circulations over complex terrain in the Valencia coastal region, Spain – Part 1: Simulation of diurnal circulation regimes G. Pérez-Landa gorkapl@confluencia.biz P. Ciais M. J. Sanz B. Gioli F. Miglietta J. L. Palau G. Gangoiti M. M. Millán Fundación CEAM. Parque Tecnológico, c/o Charles R. Darwin 14, 46980 Paterna (Valencia), Spain Laboratoire des Sciences du Climat et de l'Environnement, UMR Commissariat à l'Energie Atomique/CNRS 1572, Gif-sur-Yvette, France IBIMET-CNR, Instituto di Biometeorologia, Consiglio Nazionale delle Ricerche, Firenze, Italy Escuela Técnica Superior de Ingenieros Industriales de Bilbao, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Bilbao, Spain We collected ground-based and aircraft vertical profile measurements of meteorological parameters during a 2-week intensive campaign over the Valencia basin, in order to understand how mesoscale circulations develop over complex terrain and affect the atmospheric transport of tracers. A high-resolution version of the RAMS model was run to simulate the campaign and characterize the diurnal patterns of the flow regime: night-time katabatic drainage, morning sea-breeze development and its subsequent coupling with mountain up-slopes, and evening flow-veering under larger-scale interactions. 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