Changeset 11674 for NEMO/trunk/doc/latex/NEMO/subfiles/chap_ZDF.tex
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 20191011T00:15:08+02:00 (13 months ago)
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NEMO/trunk/doc/latex/NEMO/subfiles/chap_ZDF.tex
r11599 r11674 533 533 in \citet{reffray.guillaume.ea_GMD15} for the \NEMO\ model. 534 534 535 %% ================================================================================================= 536 \subsection[OSM: OSMosis boundary layer scheme (\forcode{ln_zdfosm})]{OSM: OSMosis boundary layer scheme (\protect\np{ln_zdfosm}{ln\_zdfosm})} 535 %  536 % OSM OSMOSIS BL Scheme 537 %  538 \subsection[OSM: OSMOSIS boundary layer scheme (\forcode{ln_zdfosm = .true.})] 539 {OSM: OSMOSIS boundary layer scheme (\protect\np{ln\_zdfosm}\forcode{ = .true.})} 537 540 \label{subsec:ZDF_osm} 538 541 … … 543 546 \end{listing} 544 547 545 The OSMOSIS turbulent closure scheme is based on...... TBC 548 Much of the time the turbulent motions in the ocean surface boundary 549 layer (OSBL) are not given by 550 classical shear turbulence. Instead they are in a regime dominated by an 551 interaction between the currents and the Stokes drift of the surface waves known as 552 `Langmuir turbulence' \citep[e.g.][]{mcwilliams.ea_JFM97}. 553 The OSMOSIS model is fundamentally based on results of Large Eddy 554 Simulations (LES) of Langmuir turbulence and aims to fully describe 555 this Langmuir regime. 556 557 The OSMOSIS turbulent closure scheme is a similarityscale scheme in 558 the same spirit as the Kprofile 559 parameterization (KPP) scheme of \citet{large.ea_RG97}. 560 A specified shape of diffusivity, scaled by the (OSBL) depth 561 $h_{\mathrm{BL}}$ and a turbulent velocity scale, is imposed throughout the 562 boundary layer 563 $h_{\mathrm{BL}}<z<\eta$. 564 However, rather than the OSBL 565 depth being diagnosed in terms of a bulk Richardson number criterion, 566 as in KPP, it is set by a prognostic equation that is informed by 567 energy budget considerations reminiscent of the classical mixed layer 568 models of \citet{kraus.turner_tellus67}. 569 The model also includes an explicit parametrization of the structure 570 of the pycnocline (the stratified region at the bottom of the OSBL). 571 572 \subsubsection{The flux gradient model} 573 574 The turbulent closure model 575 also includes ``nonlocal'' (independent of the local property gradient) 576 fluxes of tracers and momentum. 546 577 547 578 %% =================================================================================================
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