17 Jan 2023
17 Jan 2023
Status: this preprint is currently under review for the journal ESSD.

Extension of high temporal resolution sea level time series at Socoa (Saint Jean-de-Luz, France) back to 1875

Md Jamal Uddin Khan1, Inge Van Den Beld2, Guy Wöppelmann1, Laurent Testut1, Alexa Latapy2, and Nicolas Pouvreau2 Md Jamal Uddin Khan et al.
  • 1LIttoral ENvironnement et Sociétés - UMR 7266, ULR/CNRS, La Rochelle, 17000, France
  • 2Service Hydrographique et Océanographique de la Marine (SHOM), Brest, 29200, France

Abstract. In this data paper sea level time series at Socoa (Saint Jean-de-Luz, Southwestern France) is extended in a data archaeology exercise. We have catalogued water level records stored in ledgers and charts, as well as other associated documents (metadata) in thorough research of national and local archives. An extensive effort was made to rescue these documents by archiving them in digital formats. Based on this large set of rescued documents, the Socoa time series is further extended back in time by about 40 years, at hourly (for ledgers) to 5-minutes (for charts) sampling. Analysis of the precise levelling information reveals that the datum of the tide gauge site has been stable. We assessed the consistency of this new century-long time series based on nearby tide gauge data. Although the overall timeseries is generally consistent, siltation is found to be a recurrent problem of the stilling well which impacted some part of the extended data. However, being a high temporal resolution sea level time series spanning more than 100 years, this new dataset will be useful for advancing climate research, particularly the decadal scale variations in the North Atlantic, as well as the storminess and extreme events along the French Basque coastal region.

Md Jamal Uddin Khan et al.

Status: open (until 14 Mar 2023)

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Md Jamal Uddin Khan et al.

Data sets

Sea level data archaeology at Socoa (Saint Jean-de-Luz, France) Md Jamal Uddin Khan, Inge Van Den Beld, Guy Woppelmann, Laurent Testut, Alexa Latapy, Nicolas Pouvreau

Md Jamal Uddin Khan et al.


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Short summary
Established in 1875, Socoa tide gauge is one of the long-running permanent tide-gauge of the South-Western France region. However, a large part of its record was in paper format in various archives facing risk of damage. Through data archaeology, these data and associated metadata documents are rescued, digitized, and constructed into a uniform hourly sea level time series from 1875 to date. This new dataset will be useful for climate research on sea level rise, tide, and storm surges.