Changeset 11685 for NEMO/trunk/doc/latex/NEMO/subfiles/chap_ZDF.tex
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 20191011T00:16:22+02:00 (5 years ago)
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NEMO/trunk/doc/latex/NEMO/subfiles/chap_ZDF.tex
r11684 r11685 537 537 %  538 538 \subsection[OSM: OSMOSIS boundary layer scheme (\forcode{ln_zdfosm = .true.})] 539 {OSM: OSMOSIS boundary layer scheme (\protect\np{ln_zdfosm}{ln\_zdfosm} \forcode{ = .true.})}539 {OSM: OSMOSIS boundary layer scheme (\protect\np{ln_zdfosm}{ln\_zdfosm})} 540 540 \label{subsec:ZDF_osm} 541 541 … … 558 558 \protect\np{rn_m_la}{rn\_m\_la} is 0.3. The Stokes penetration 559 559 depth $\delta = $ \protect\np{rn_osm_dstokes}{rn\_osm\_dstokes}; this has default value 560 of \SI{5}{m}.560 of 5~m. 561 561 562 562 \item \protect\np[=1]{nn_osm_wave}{nn\_osm\_wave} In this case the Stokes drift is … … 565 565 spectrum. Significant wave height and 566 566 wavemean period taken from this spectrum are used to calculate the Stokes penetration 567 depth, following the approach set out in Breivik(XXxx)567 depth, following the approach set out in \citet{breivik.janssen.ea_JPO14}. 568 568 569 \item \protect\np[=2]{nn \_osm_wave}{nn\_osm\_wave} In this case the Stokes drift is569 \item \protect\np[=2]{nn_osm_wave}{nn\_osm\_wave} In this case the Stokes drift is 570 570 taken from ECMWF wave model output, though only the component parallel 571 571 to the wind stress is retained. Significant wave height and 572 572 wavemean period from ECMWF wave model output are used to calculate the Stokes penetration 573 depth, following the approach set out in Breivik(XXxx).573 depth, again following \citet{breivik.janssen.ea_JPO14}. 574 574 575 575 \end{description} … … 580 580 \item \protect\np{ln_kpprimix} {ln\_kpprimix} Default is \np{.true.}. Switches on KPPstyle Ri \#dependent 581 581 mixing below the surface boundary layer. If this is set 582 \ np{.true.} the following variable settings are honoured:582 \texttt{.true.} the following variable settings are honoured: 583 583 \item \protect\np{rn_riinfty}{rn\_riinfty} Critical value of local Ri \# below which 584 584 shear instability increases vertical mixing from background value. 585 585 \item \protect\np{rn_difri} {rn\_difri} Maximum value of Ri \#dependent mixing at $\mathrm{Ri}=0$. 586 586 \item \protect\np{ln_convmix}{ln\_convmix} If \texttt{.true.} then, where water column is unstable, specify 587 diffusivity equal to \protect\np{rn_dif_conv}{rn\_dif\_conv} (default value is 1 m s$^{2}$).587 diffusivity equal to \protect\np{rn_dif_conv}{rn\_dif\_conv} (default value is 1 m~s$^{2}$). 588 588 \end{description} 589 589 Diagnostic output is controlled by: … … 599 599 mixing. Not taken account of. 600 600 \item \protect\np{rn_osm_hbl0} {rn\_osm\_hbl0} Depth of initial boundary layer is now set 601 by a density criterion similar to that used in calculating hmlp (output as mldr10_1) in zdfmxl.F90.601 by a density criterion similar to that used in calculating \emph{hmlp} (output as \texttt{mldr10\_1}) in \mdl{zdfmxl}. 602 602 \end{description} 603 603 … … 612 612 The OSMOSIS model is fundamentally based on results of Large Eddy 613 613 Simulations (LES) of Langmuir turbulence and aims to fully describe 614 this Langmuir regime. The description in this section is of necessity incomplete and further details are available in the manuscript ``The OSMOSIS scheme'',Grant. A (2019); in prep.614 this Langmuir regime. The description in this section is of necessity incomplete and further details are available in Grant. A (2019); in prep. 615 615 616 616 The OSMOSIS turbulent closure scheme is a similarityscale scheme in … … 722 722 \frac{\partial h_\mathrm{bl}}{\partial t} = W_b  \frac{{\overline{w^\prime b^\prime}}_\mathrm{ent}}{\Delta B_\mathrm{bl}} 723 723 \end{equation} 724 where $h_\mathrm{bl}$ is the horizontallyvarying depth of the OSBL, $\mathbf{U}_b$ and $W_b$ are the mean horizontal and vertical velocities at the base of the OSBL, ${\overline{w^\prime b^\prime}}_\mathrm{ent}$ is the buoyancy flux due to entrainment and $\Delta B_\mathrm{bl}$ is the difference between the buoyancy averaged over the depth of the OSBL (i.e.\ including the ML and pycnocline) and the buoyancy just below the base of the OSBL. This equation for the case when the pycnocline has a finite thickness, based on the potential energy budget of the OSBL, is the leading term \citep{grant+etal18} of a generalization of that used in mixedlayer models \citet[e.g.][]{kraus.turner_tellus67}, in which the thickness of the pycnocline is taken to be zero. 724 where $h_\mathrm{bl}$ is the horizontallyvarying depth of the OSBL, 725 $\mathbf{U}_b$ and $W_b$ are the mean horizontal and vertical 726 velocities at the base of the OSBL, ${\overline{w^\prime 727 b^\prime}}_\mathrm{ent}$ is the buoyancy flux due to entrainment 728 and $\Delta B_\mathrm{bl}$ is the difference between the buoyancy 729 averaged over the depth of the OSBL (i.e.\ including the ML and 730 pycnocline) and the buoyancy just below the base of the OSBL. This 731 equation for the case when the pycnocline has a finite thickness, 732 based on the potential energy budget of the OSBL, is the leading term 733 \citep{grant+etal18} of a generalization of that used in mixedlayer 734 models e.g.\ \citet{kraus.turner_tellus67}, in which the thickness of the pycnocline is taken to be zero. 725 735 726 736 The entrainment flux for the combination of convective and Langmuir turbulence is given by
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