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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;"><font size="2"><span style="font-size: 10pt;">Dear all,<br>
<br>
the Journal of Climate has published a paper on stochastic sea ice parameterization as an 'Early Online Release' which might be of interest to some of you.<br>
<br>
Best regards,<br>
<br>
Stephan Juricke<br>
</span></font>
<h1 style="font-weight: normal;" class="arttitle"><font size="2">Effects of stochastic ice strength perturbation on Arctic finite element sea ice modelling</font></h1>
<p>S. Juricke, P. Lemke, R. Timmermann, and T. Rackow<br>
</p>
<div class="articleMeta"><span>Journal of Climate </span>2012 ; e-View </div>
<div class="articleMeta">doi: <a href="http://dx.doi.org/10.1175/JCLI-D-12-00388.1">
http://dx.doi.org/10.1175/JCLI-D-12-00388.1</a> </div>
<font size="2"><span style="font-size: 10pt;"><br>
Abstract:<br>
<br>
</span></font>The ice strength parameter <i>P</i>* is a key parameter in dynamic-thermodynamic sea ice models which can not be measured directly. Stochastically perturbing
<i>P</i>* in the Finite Element Sea ice-Ocean Model (FESOM) of the Alfred Wegener Institute aims at investigating the effect of uncertainty pertaining to this parameterization. Three different approaches using symmetric perturbations have been applied: (1)
reassignment of uncorrelated noise fields to perturb <i>P</i>* at every grid point, (2) a Markov chain time correlation, and (3) a Markov chain time correlation with some spatial correlation between nodes. Despite symmetric perturbations, results show an increase
of Arctic sea ice volume and a decrease of Arctic sea ice area for all three approaches. Especially the introduction of spatial correlation leads to a substantial increase in sea ice volume and mean thickness. The strongest response can be seen for multiyear
ice north of the Greenland coast. An ensemble of eight perturbed simulations generates a spread in the multiyear ice comparable to the interannual variability of the model. Results can not be reproduced by a simple constant global modification of
<i>P</i>*.<br>
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