Inhibited upper ocean restratification in nonequilibrium swell conditions
Plueddemann, Albert J.
Sullivan, Peter P.
MetadataShow full item record
KeywordSwell; Upper ocean turbulence; Restratification; Diurinal heating; Langmuir turbulence; Langmuir circulation
Diurnal restratification of the ocean surface boundary layer (OSBL) represents a competition between mixing of the OSBL and solar heating. Langmuir turbulence (LT) is a mixing process in the OSBL, driven by wind and surface waves, that transfers momentum, heat, and mass. Observations in nonequilibrium swell conditions reveal that the OSBL does not restratify despite low winds and strong solar radiation. Motivated by observations, we use large-eddy simulations of the wave-averaged Navier-Stokes equations to show that LT is capable of inhibiting diurnal restratification of the OSBL. Incoming heat is redistributed vertically by LT, forming a warmer OSBL with a nearly uniform temperature. The inhibition of restratification is not reproduced by two common Reynolds-averaged Navier-Stokes equation models, highlighting the importance of properly representing sea-state dependent LT dynamics in OSBL models.
Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 40 (2013): 3672–3676, doi:10.1002/grl.50708.
Showing items related by title, author, creator and subject.
Distribution of recycled crust within the upper mantle : insights from the oxygen isotope composition of MORB from the Australian-Antarctic Discordance Cooper, Kari M.; Eiler, John M.; Sims, Kenneth W. W.; Langmuir, Charles H. (American Geophysical Union, 2009-12-03)Geochemical heterogeneity within the mantle has long been recognized through the diversity of trace element and radiogenic isotopic compositions of mantle-derived rocks, yet the specific origin, abundance, and distribution ...
Timmermans, Mary-Louise; Cole, Sylvia T.; Toole, John M. (American Meteorological Society, 2012-04)Ice-tethered profiler (ITP) measurements from the Arctic Ocean’s Canada Basin indicate an ocean surface layer beneath sea ice with significant horizontal density structure on scales of hundreds of kilometers to the order ...
Herbers, T. H. C.; Lentz, Steven J. (American Meteorological Society, 2010-01)Acoustic Doppler current profilers (ADCPs) are widely used for routine measurements of ocean currents and waves in coastal environments. These instruments have the basic capability to measure surface wave frequency–directional ...