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| Titel |
Modelling turbulent vertical mixing sensitivity using a 1-D version of NEMO |
| VerfasserIn |
G. Reffray, R. Bourdallé-Badie, C. Calone |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 8, no. 1 ; Nr. 8, no. 1 (2015-01-22), S.69-86 |
| Datensatznummer |
250116030
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| Publikation (Nr.) |
 copernicus.org/gmd-8-69-2015.pdf |
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| Zusammenfassung |
| Through two numerical experiments, a 1-D vertical model called NEMO1D was
used to investigate physical and numerical turbulent-mixing behaviour. The
results show that all the turbulent closures tested (k+l from Blanke and
Delecluse, 1993, and two equation models: generic length scale closures from
Umlauf and Burchard, 2003) are able to correctly reproduce the classical
test of Kato and Phillips (1969) under favourable numerical conditions while
some solutions may diverge depending on the degradation of the spatial and
time discretization. The performances of turbulence models were then
compared with data measured over a 1-year period (mid-2010 to mid-2011) at
the PAPA station, located in the North Pacific Ocean. The modelled
temperature and salinity were in good agreement with the observations, with
a maximum temperature error between −2 and 2 °C
during the stratified period (June to October). However, the results also
depend on the numerical conditions. The vertical RMSE varied, for different
turbulent closures, from 0.1 to 0.3 °C during the
stratified period and from 0.03 to 0.15 °C during the
homogeneous period. This 1-D configuration at the PAPA station (called
PAPA1D) is now available in NEMO as a reference configuration including the
input files and atmospheric forcing set described in this paper. Thus, all
the results described can be recovered by downloading and launching PAPA1D.
The configuration is described on the NEMO site (http://www.nemo-ocean.eu/Using-NEMO/Configurations/C1D_PAPA). This
package is a good starting point for further investigation of vertical
processes. |
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