CMCC Webinar
22 November 2022 – h 12.30 pm CET
Click on the following link for registration: https://bit.ly/Webi2211

Speaker
Gaspard Alexandre Geoffroy, Department of Meteorology, Stockholm University

Moderator
Nadia Pinardi, CMCC and University of Bologna

Abstract
The ocean state has been shown to be sensitive to the mixing originating from internal tides (IT). However, to date, our knowledge of the magnitude and distribution of this mixing mostly relies on uncertain modeling. Therefore, observations are needed to better constrain the propagation and breaking of IT in models. A central complication then arises from the interactions of the propagating IT with the time varying general circulation. As the waves propagate they decorrelate: their phase shifts and is no longer locked to the phase of the generating force. This causes the longterm phase locked variance (i.e. energy) of IT to decay with increasing distance from their generation site. The total variance – the sum of the phase locked and non phase locked components – is not affected by the decorrelation, but by mixing, scattering, and nonlinear processes. The geographical distribution of the total variance can thus be used to better understand these decay processes. In this presentation, the speaker will introduce a recently published global map of the total semidiurnal IT variance at 1,000 dbar computed from Argo park phase data.

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