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Impact of the Rhone and Durance valleys on sea-breeze Circulation in the Marseille Area

Bastin, Sophie and Drobinski, Philippe and Dabas, Alain and Delville, Patricia and Reitebuch, Oliver and Werner, Christian (2005) Impact of the Rhone and Durance valleys on sea-breeze Circulation in the Marseille Area. Atmospheric Research, 74, pp. 303-328. DOI: 10.1016/j.atmosres.2004.04.014.

Full text not available from this repository.

Abstract

Sea-breeze dynamics in the Marseille area, in the south of France, is investigated in the framework of the ESCOMPTE experiment conducted during summer 2001 in order to evaluate the role of thermal circulations on pollutant transport and ventilation. Under particular attention in this paper is the sea-breeze channelling by the broad Rhône valley and the narrow Durance valley, both oriented nearly-north–south, i.e., perpendicular to the coastline, and its possible impact on the sea-breeze penetration, intensity and depth, which are key information for air pollution issues. One situation of slight synoptic pressure gradient leading to a northerly flow in the Rhône valley (25 June 2001) and one situation of a weak onshore prevailing synoptic wind (26 June 2001) are compared. The impact of the Rhône and Durance valleys on the sea-breeze dynamics on these two typical days is generalized to the whole ESCOMPTE observing period. The present study shows by combining simple scaling analysis with wind data from meteorological surface stations and Doppler lidars that (i) the Durance valley always affects the sea breeze by accelerating the flow. A consequence is that the Durance valley contributes to weaken the temperature gradient along the valley and thus the sea-breeze circulation. In some cases, the acceleration of the channelled flow in the Durance valley suppresses the sea-breeze flow by temperature gradient inhibition; (ii) the Rhône valley does not generally affect the sea breeze significantly. However, if the sea breeze is combined with an onshore flow, it leads to further penetration inland and intensification of the low-level southerly flow. In this situation, lateral constriction may accelerate the sea breeze. Simple scaling analysis suggests that Saint Paul (44.35°N, about 100 km from the coastline) is the lower limit where sea breeze can be affected by the Rhône valley. These conclusions have implications in air quality topics as channelled sea breeze may advect far inland pollutants which may be incorporated into long-range transport, particularly in the Durance valley.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2005,
Title:Impact of the Rhone and Durance valleys on sea-breeze Circulation in the Marseille Area
Authors:
AuthorsInstitution or Email of Authors
Bastin, SophieIPSL, Service d’Aéronomie, Paris, F
Drobinski, PhilippeIPSL, Service d’Aéronomie, Paris, F
Dabas, AlainCNRM/Meteo-France, Toulouse, F
Delville, PatriciaDT-INSU, Meudon, F
Reitebuch, OliverUNSPECIFIED
Werner, ChristianUNSPECIFIED
Date:2005
Journal or Publication Title:Atmospheric Research
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:74
DOI:10.1016/j.atmosres.2004.04.014
Page Range:pp. 303-328
Status:Published
Keywords:sea breeze; valley flows; doppler lidar
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: elib DLR-Beauftragter
Deposited On:26 Sep 2007
Last Modified:14 Jan 2010 19:39

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