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

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

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Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Zusätzliche Informationen: LIDO-Berichtsjahr=2005,
Titel:Impact of the Rhone and Durance valleys on sea-breeze Circulation in the Marseille Area
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
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, OliverNICHT SPEZIFIZIERT
Werner, ChristianNICHT SPEZIFIZIERT
Datum:2005
Erschienen in:Atmospheric Research
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:74
DOI :10.1016/j.atmosres.2004.04.014
Seitenbereich:Seiten 303-328
Status:veröffentlicht
Stichwörter:sea breeze; valley flows; doppler lidar
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):NICHT SPEZIFIZIERT
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Lidar
Hinterlegt von: elib DLR-Beauftragter
Hinterlegt am:26 Sep 2007
Letzte Änderung:11 Nov 2014 21:55

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