Changeset 11681
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 20191011T00:15:54+02:00 (5 years ago)
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NEMO/trunk/doc/latex/NEMO/subfiles/chap_ZDF.tex
r11680 r11681 546 546 \end{listing} 547 547 548 % 549 \paragraph{Namelist choices} 550 Most of the namelist options refer to how to specify the Stokes 551 surface drift and penetration depth. There are three options: 552 \begin{enumerate} 553 \item \texttt{nn_osm_wave=0}. In this case the Stokes drift is 554 assumed to be parallel to the surface wind stress, with 555 magnitude consistent with a constant turbulent Langmuir number 556 $\mathrm{La}_t= \texttt{rn_m_la}$ i.e.\ 557 $u_[s0}=\tau/(\texttt{rn_m_la}^2\rho_0)$. 558 \item \texttt{nn_osm_wave=1}. In this case the Stokes drift is 559 assumed to be parallel to the surface wind stress, with 560 magnitude as in the classical PiersonMoskowitz windsea 561 spectrum. 562 \item \texttt{nn_osm_wave=2}. In this case the Stokes drift is 563 taken from ECMWF wave model output. Significant wave height and 564 wavemean period are used to calciulate the Stokes penetration 565 depth, followingh the approach set out in Breivik(XXxx) 566 567 \end{enumerate} 568 \subsubsection{Summary} 548 569 Much of the time the turbulent motions in the ocean surface boundary 549 570 layer (OSBL) are not given by … … 603 624 \nu_{\ast}= \left\{ u_*^3 \left[1\exp(1.5 \mathrm{La}_t^2})\right]+w_{*L}^3\right\}^{1/3}. 604 625 \end{equation} 605 For the unstable boundary layer this is merged with the standard convective velocity scale $w_{*C}=\left(\overline{w^\prime b^\prime}_0 \,h_\mathrm{ml}\right)^{1/3}$, where $\overline{w^\prime b^\prime}_0$ is the upwards surface buoyancy flux to give:626 For the unstable boundary layer this is merged with the standard convective velocity scale $w_{*C}=\left(\overline{w^\prime b^\prime}_0 \,h_\mathrm{ml}\right)^{1/3}$, where $\overline{w^\prime b^\prime}_0$ is the upwards surface buoyancy flux, to give: 606 627 \begin{equation}\label{eq:velscaleunstable} 607 628 \omega_* = \left(\nu_*^3 + 0.5 w_{*C}^3\right)^{1/3}.
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