Cause of amplitude differences between tilt instruments

Determine what causes the different tilt-angle amplitudes recorded by the T-sensor and current-meter instrumentation mounted near the upper buoy of the mooring line.

Background

The upper T-sensor and current-meter tilt records generally agree but differ in amplitude during both large and small excursions. The paper suggests possible explanations involving the non-stiff connection, their approximately 1-m vertical separation, and differential sensitivity to vertical shear, but explicitly leaves the cause unresolved.

References

It is not clear what causes these different tilt-angle amplitudes between the instrumentation, but it is likely due to the non-stiff connection, and about 1 m different vertical position, between buoy and vertical line and thus a different response upon forcing.

— Short spatial mooring-tilt variations from deep Mediterranean observations  (2608.21046 - Haren, 21 Aug 2026) in Appendix A, page 15