IMIS | Flanders Marine Institute
 

Flanders Marine Institute

Platform for marine research

IMIS

Publications | Institutes | Persons | Datasets | Projects | Maps
[ report an error in this record ]basket (0): add | show Printer-friendly version

Distinguishing turbulent overturns in high-sampling-rate moored thermistor string observations
van Haren, H.; Gostiaux, L. (2015). Distinguishing turbulent overturns in high-sampling-rate moored thermistor string observations. J. Mar. Res. 73(1-2): 17-32. dx.doi.org/10.1357/002224015815782661
In: Journal of Marine Research. Sears Foundation for Marine Research, Yale University: New Haven, Conn.. ISSN 0022-2402, more
Peer reviewed article  

Available in  Authors 

Author keywords
    DETAILED OCEAN MIXING PARAMETER ESTIMATES; HIGH-RESOLUTION TEMPERATURE OBSERVATIONS; SALINITY-COMPENSATED INTRUSIONS; TURBULENT OVERTURN PATTERNS

Authors  Top 
  • van Haren, H., more
  • Gostiaux, L.

Abstract
    Turbulent overturns are distinguished from salinity-compensated intrusions in high-resolution moored thermistor string observations. The buoyancy frequency N is used to make the time dimensionless, "t*." This results in a primary, visual means to easily compare the duration of overturns with N, the natural frequency that separates internal waves from turbulent overturns. As a secondary means, the shapes of overturns are investigated. Above various sloping topography between 500 and 1,000 m water depth where the buoyancy period varies between ~1,300 and 2,600 s, vertical overturns of ~40 m last ?t* =0.2–0.4. This corresponds with the timescale of growth of model-stratified turbulence in the wake of a grid. Smaller-scale, weaker-turbulent, shear-induced Kelvin-Helmholtz overturns of ~5 m are observed to last approximately ?t* = 0.03, whereas the passage of their train of multiple consecutive overturns lasts up to approximately ?t* = 0.95. Although the shape of overturns can distinguish salinity-compensated intrusions from turbulent overturns, the present observations from internal wave breaking above sloping topography show complex results of mixed features

All data in IMIS is subject to the VLIZ privacy policy Top | Authors