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<pre wrap="">Dear all,
The following paper has been published in Ocean Modelling:
<b><strong>Brankart J.-M.</strong></b> Impact of uncertainties in the horizontal density gradient
upon low resolution global ocean modelling. <em>Ocean Modelling</em>, <strong>66</strong>, 64-76, 2013.
doi:<a id="ddDoi" href="http://dx.doi.org/10.1016/j.ocemod.2013.02.004"
target="doilink">http://dx.doi.org/10.1016/j.ocemod.2013.02.004</a></pre>
<div class="abstract svAbstract ">
<h3 class="secHeading" id="section_abstract"><tt>Abstract:</tt></h3>
<p id="sp010"><tt>In
this study, it is shown (i) that, as a result of the nonlinearity of
the seawater equation of state, unresolved scales represent a major
source of uncertainties in the computation of the large-scale
horizontal density gradient from the large-scale temperature and
salinity fields, and (ii) that the effect of these uncertainties can be
simulated using random processes to represent unresolved temperature
and salinity fluctuations. The results of experiments performed with a
low resolution global ocean model show that this parameterization has a
considerable effect on the average large-scale circulation of the
ocean, especially in the regions of intense mesoscale activity. The
large-scale flow is less geostrophic, with more intense associated
vertical velocities, and the average geographical position of the main
temperature and salinity fronts is more consistent with observations.
In particular, the simulations suggest that the stochastic effect of
the unresolved temperature and salinity fluctuations on the large-scale
density field may be sufficient to explain why the Gulf Stream pathway
systematically overshoots in non-stochastic low resolution ocean models.<br>
</tt></p>
<p id="sp010"><tt><br>
Best regards,<br>
</tt></p>
<p id="sp010"><tt>Jean-Michel Brankart<br>
</tt></p>
</div>
<pre class="moz-signature" cols="72">--
---------------------------------------------------------
Jean-Michel BRANKART
Laboratoire de Glaciologie et de Géophysique de l'Environnement
BP53X
F-38041 Grenoble Cedex
FRANCE
Phone: + 33 4 76825034
Fax: + 33 4 76825271
e-mail: <a class="moz-txt-link-abbreviated" href="mailto:Jean-Michel.Brankart@hmg.inpg.fr">Jean-Michel.Brankart@hmg.inpg.fr</a>
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</pre>
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