Kevin Robache, post-doctoral fellow at the MIO, will give a seminar on Friday 3 March 2026 à 13h00, at the OCEANOMED Amphitheatre, on the theme : Characterisation of vertical velocity variability off New Caledonia.
Abstract
Ocean circulation is the result of numerous processes that give rise to three-dimensional, multi-scale dynamics that are difficult to describe and explain. However, it is essential to understand these dynamics, as they determine many marine phenomena, particularly biogeochemical ones. This is the background to the AMIDEX HOPE-VV project (P. I. Anne A. Petrenko), which is studying the influence of vertical velocities on carbon export flows in the subtropical South Pacific, off Noumea. The dynamics of vertical velocities (noted w) are still poorly understood, in particular due to their low amplitude compared with horizontal and vertical velocities, which makes them difficult to measure and often leads to them being neglected. As part of the project, several sensors were deployed to measure w at high frequency, with a time resolution of two hours. The aim of this work is initially to characterise the multi-scale dynamics of vertical velocities using statistical tools for analysing time series. The first results from these analyses will be presented.
