(b) UFR des Sciences Géographiques et de l’Aménagement

Sea-surge variations recorded at three tide-gauge stations (Grau-de-la-Dent, Sète, and Port-Vendres) around the Gulf of Lions (Northwest Mediterranean Sea) are mostly locally forced by onshore winds blowing from 90 ° to 180 ° related to an atmospheric depression usually centered between the Bay of B...

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Bibliographic Details
Main Authors: A. Ullmann (a, V. Moron (b, Université De Provence, Aix-marseille I
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 2010
Subjects:
Key words
sea surge
wind conditions
North-Atlantic Oscillation
Mediterranean Sea
Dent
La Dent
Iceland
North Atlantic
North Atlantic oscillation
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.413.5802
http://hal.archives-ouvertes.fr/docs/00/44/73/24/PDF/Ullmann_Moron.pdf
Description
Summary:Sea-surge variations recorded at three tide-gauge stations (Grau-de-la-Dent, Sète, and Port-Vendres) around the Gulf of Lions (Northwest Mediterranean Sea) are mostly locally forced by onshore winds blowing from 90 ° to 180 ° related to an atmospheric depression usually centered between the Bay of Biscay and the British Island, which is more prevalent during the negative phase of the North-Atlantic Oscillation (NAO). During the second half of the 20 th century, the long-term increase of sea-surge height at Grau-de-la-Dent finds no counterpart in the positive deviation of the NAO. The relationship between the monthly frequency of sea surges> 20 cm at Grau-de-la-Dent and the monthly mean NAO Index significantly strengthens from 1975. This is synchronous with the eastward shift of the two main centers of the NAO (i.e. Iceland low and Azores high) and an increase of the occurrence of depressions near the Bay of Biscay and of surge-related onshore winds in the Gulf of Lions during negative phases of the NAO.

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