Estimating time-dependent mesoscale mixing from moorings in the Irminger Sea

Wednesday 9 June 2021 - 14:00 to 15:00
Virtual / VC
Rick de Kreij, Eindhoven University of Technology

Mesoscale mixing occurs on large scales up to tens of kilometres and is an essential mechanism for distributing tracers such as heat, carbon, nutrients and oxygen throughout the entire ocean. Understanding of mesoscale mixing is necessary for improving numerical simulations of the ocean in climate systems. Within this study, the mesoscale mixing is derived from moorings by combining mixing length theory, mean-flow suppression theory and vertical eddy structures. We estimate mesoscale mixing for seasonally, weekly and daily time scales, where we find strong intermittency of the mesoscale mixing on both weekly and daily time scales. This intermittency consists of a series of strong mixing bursts followed by periods of hardly any mixing. Till now, the intermittency has not been documented and is a novel insight gained through this study.

Seminar category: