Oceanography Brown Bag - Alexis Kaminski

The effect of existing turbulence on stratified shear instability
Alexis Kaminski
Oregon State University

Abstract:
Ocean turbulence is an essential process governing, for example, heat uptake by the ocean. In the stably-stratified ocean interior, this turbulence occurs in discrete events driven by vertical variations of the horizontal velocity. Typically, these events have been modelled by assuming an initially laminar stratified shear flow which develops wavelike instabilities, becomes fully turbulent, and then relaminarizes into a stable state. However, in the real ocean there is always some level of turbulence left over from previous events, and it is not yet understood how this turbulence impacts the evolution of future mixing events. Here, we perform a series of direct numerical simulations of turbulent events developing in stratified shear flows that are already at least weakly turbulent. We do so by varying the amplitude of the initial perturbations, and examine the subsequent development of the instability and the impact on the resulting turbulent fluxes. 

Thursday, 16 November 2017

12:30 – 1:30 pm
Mesa Lab, 1850 Table Mesa Drive, Boulder, CO
ML-239 – Damon Room

Seminar will not be webcast

For more information, please contact Teresa Foster, teresaf@ucar.edu, 303-497-1741 

Building:

Room Number: 
ML-239 Damon Room

Type of event:

Will this event be webcast to the public by NCAR|UCAR?: 
No
Calendar Timing: 
Thursday, November 16, 2017 - 12:30pm to 1:30pm