Changeset 11123 for NEMO/trunk/doc/latex/NEMO/subfiles/chap_DIA.tex
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- 2019-06-17T14:22:27+02:00 (5 years ago)
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NEMO/trunk/doc/latex/NEMO/subfiles/chap_DIA.tex
r10509 r11123 1507 1507 remain at a given depth ($w = 0$ in the computation) have been introduced in the system during the CLIPPER project. 1508 1508 Options are defined by \ngn{namflo} namelis variables. 1509 The algorithm used is based either on the work of \cite{ Blanke_Raynaud_JPO97} (default option),1509 The algorithm used is based either on the work of \cite{blanke.raynaud_JPO97} (default option), 1510 1510 or on a $4^th$ Runge-Hutta algorithm (\np{ln\_flork4}\forcode{ = .true.}). 1511 Note that the \cite{ Blanke_Raynaud_JPO97} algorithm have the advantage of providing trajectories which1511 Note that the \cite{blanke.raynaud_JPO97} algorithm have the advantage of providing trajectories which 1512 1512 are consistent with the numeric of the code, so that the trajectories never intercept the bathymetry. 1513 1513 … … 1809 1809 The steric effect is therefore not explicitely represented. 1810 1810 This approximation does not represent a serious error with respect to the flow field calculated by the model 1811 \citep{ Greatbatch_JGR94}, but extra attention is required when investigating sea level,1811 \citep{greatbatch_JGR94}, but extra attention is required when investigating sea level, 1812 1812 as steric changes are an important contribution to local changes in sea level on seasonal and climatic time scales. 1813 1813 This is especially true for investigation into sea level rise due to global warming. 1814 1814 1815 1815 Fortunately, the steric contribution to the sea level consists of a spatially uniform component that 1816 can be diagnosed by considering the mass budget of the world ocean \citep{ Greatbatch_JGR94}.1816 can be diagnosed by considering the mass budget of the world ocean \citep{greatbatch_JGR94}. 1817 1817 In order to better understand how global mean sea level evolves and thus how the steric sea level can be diagnosed, 1818 1818 we compare, in the following, the non-Boussinesq and Boussinesq cases. … … 1888 1888 the ocean surface, not by changes in mean mass of the ocean: the steric effect is missing in a Boussinesq fluid. 1889 1889 1890 Nevertheless, following \citep{ Greatbatch_JGR94}, the steric effect on the volume can be diagnosed by1890 Nevertheless, following \citep{greatbatch_JGR94}, the steric effect on the volume can be diagnosed by 1891 1891 considering the mass budget of the ocean. 1892 1892 The apparent changes in $\mathcal{M}$, mass of the ocean, which are not induced by surface mass flux 1893 1893 must be compensated by a spatially uniform change in the mean sea level due to expansion/contraction of the ocean 1894 \citep{ Greatbatch_JGR94}.1894 \citep{greatbatch_JGR94}. 1895 1895 In others words, the Boussinesq mass, $\mathcal{M}_o$, can be related to $\mathcal{M}$, 1896 1896 the total mass of the ocean seen by the Boussinesq model, via the steric contribution to the sea level, … … 1924 1924 This value is a sensible choice for the reference density used in a Boussinesq ocean climate model since, 1925 1925 with the exception of only a small percentage of the ocean, density in the World Ocean varies by no more than 1926 2$\%$ from this value (\cite{ Gill1982}, page 47).1926 2$\%$ from this value (\cite{gill_bk82}, page 47). 1927 1927 1928 1928 Second, we have assumed here that the total ocean surface, $\mathcal{A}$, … … 1954 1954 so that there are no associated ocean currents. 1955 1955 Hence, the dynamically relevant sea level is the effective sea level, 1956 \ie the sea level as if sea ice (and snow) were converted to liquid seawater \citep{ Campin_al_OM08}.1956 \ie the sea level as if sea ice (and snow) were converted to liquid seawater \citep{campin.marshall.ea_OM08}. 1957 1957 However, in the current version of \NEMO the sea-ice is levitating above the ocean without mass exchanges between 1958 1958 ice and ocean. … … 1986 1986 Among the available diagnostics the following ones are obtained when defining the \key{diahth} CPP key: 1987 1987 1988 - the mixed layer depth (based on a density criterion \citep{de _Boyer_Montegut_al_JGR04}) (\mdl{diahth})1988 - the mixed layer depth (based on a density criterion \citep{de-boyer-montegut.madec.ea_JGR04}) (\mdl{diahth}) 1989 1989 1990 1990 - the turbocline depth (based on a turbulent mixing coefficient criterion) (\mdl{diahth})
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