Tuesday 23 August 2005

GP2

PT0086
Sea level variability in the Gulf of Biscay from tide gauges and altimetry
Marcos, Marta^1,2, Woppelmann, Guy², Karpytchev, Mikhael², Bosch, Wolfgang³, Fenoglio-Marc, Luciana⁴, Liebsch, Gunter⁵
1 Institut Mediterrani d'Estudis Avançats (IMEDEA), Balears, Spain
2 Centre Littoral De Géophysique (CLDG), Université De La Rochelle, France
3 Deutsches Geodätisches Forschungsinstitut (DGFI), München, Germany
4 Institute of Physical Geodesy (IPG), Darmstad, Germany
5 Bundesamt für Kartographie und Geodäsie (BKG), Leipzig, Germany
Author email: marta.marcos@univ-lr.fr
In situ sea level data recorded in the Gulf of Biscay (Eastern North Atlantic) together with altimetry data from T/P are used to investigate the seasonal to decadal variability in the region during the period 1993-2001. A total of seven tide gauge stations in the Spanish and French coasts have been selected for the study. They are subjected to a careful intercomparison to ensure their coherency. On the other hand, sea surface heights derived from the altimetry data are resampled into fixed along-track bins along the repeated ground track of the satellite. Sea level anomalies are computed using the mean sea surface height derived from the CLS01 model. Sea level anomalies time series from both data sets are then compared and used to characterize the sea surface variability from seasonal to decadal frequencies. The influence of the dominant pattern at the region, given by the North Atlantic Oscillation (NAO), is investigated.

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