Anomalous ocean load tide signal observed in lake-level variations in Tierra del Fuego

Statistics – Computation

Scientific paper

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Geodesy And Gravity: Ocean/Earth/Atmosphere/Hydrosphere/Cryosphere Interactions (0762, 1218, 3319, 4550), Computational Geophysics: Model Verification And Validation, Geodesy And Gravity: Time Variable Gravity (7223, 7230), Oceanography: Physical: Surface Waves And Tides (1222), Geographic Location: South America

Scientific paper

We demonstrate the application of a 100 km long lake as a sensor for studying the tidal effects on Tierra del Fuego main island. The lake-level variations observed in Lago Fagnano reflect both the direct response to the tidal potential and the indirect effect of the ocean tidal loading. Modeling both contributions explains the observed tidal signal in the lake to about 70%. Underestimated model load tide amplitudes are found to be probably responsible for the remaining difference. We interpret this discrepancy as a hint for regional elastic lithosphere properties differing substantially from those represented by currently available global models.

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