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Hi Kaitlin,
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<div class="">I think that there is (or at least used to be) a potential problem with using rstar when you have thick sea ice - specifically when using rstar together with JMD95Z as the EOS. I don’t remember the details now, but it has to do with spurious
density gradients when rstar surfaces are tilted. Setting selectP_inEOS_Zc=2 should fix the problem. I’ve had a long email conversation about this issue with Jean-Michel at some point. If you want, I can forward that to you.</div>
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<div class="">Cheers,</div>
<div class="">Malte</div>
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<div class="">On Oct 15, 2018, at 4:35 AM, Naughten, Kaitlin A. <<a href="mailto:kaight@bas.ac.uk" class="">kaight@bas.ac.uk</a>> wrote:</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Hi Martin,</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Thanks for your response. Good to know that rStar should work with cavities. I suppose the differences between rStar and no-rStar could be that the "surf adjustment" the nonlinear free surface scheme
is doing in the absence of rStar, i.e. adding water to the model in regions which violate hFacInf, is changing the tracer properties and/or circulation. I have a few patches of very thick sea ice which are depressing the sea surface and causing those hFacInf
errors. So maybe rStar is actually more accurate than nonlinear free surface without rStar. I am trying a run now with the linear free surface for comparison.</div>
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<div style="margin-top: 0px; margin-bottom: 0px;" class="">Many thanks,</div>
<div style="margin-top: 0px; margin-bottom: 0px;" class="">Kaitlin</div>
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<font face="Calibri, sans-serif" style="font-size: 11pt;" class=""><b class="">From:</b><span class="Apple-converted-space"> </span>MITgcm-support <<a href="mailto:mitgcm-support-bounces@mitgcm.org" class="">mitgcm-support-bounces@mitgcm.org</a>> on behalf
of Martin Losch <<a href="mailto:Martin.Losch@awi.de" class="">Martin.Losch@awi.de</a>><br class="">
<b class="">Sent:</b><span class="Apple-converted-space"> </span>12 October 2018 16:15:24<br class="">
<b class="">To:</b><span class="Apple-converted-space"> </span>MITgcm Support<br class="">
<b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [MITgcm-support] rStar with cavities</font>
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<div class="PlainText">Hi Kaitlin,<br class="">
<br class="">
I think they should work together.<span class="Apple-converted-space"> </span><br class="">
I have once (in the very beginning of this in 2006 or so) tried to use the rStar coordinates as surface (topography) following coordinates for better near surface resolution in the cavities, but because we don’t have a decent formulation for the pressure gradient
for the case of strongly sloping vertical layer interfaces, this leads to too much pressure gradient error.<br class="">
<br class="">
Martin<br class="">
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<br class="">
> On 10. Oct 2018, at 12:54, Naughten, Kaitlin A. <<a href="mailto:kaight@bas.ac.uk" class="">kaight@bas.ac.uk</a>> wrote:<br class="">
><span class="Apple-converted-space"> </span><br class="">
> Hi everyone,<br class="">
><span class="Apple-converted-space"> </span><br class="">
> Is it okay to use rStar with the SHELFICE package? Looking at some old messages I can't figure out whether or not there is a problem with this. I ran with and without rStar and can see some non-negligible differences in the cavity, which is a bit concerning.
Is it confirmed whether or not they work together?<br class="">
><span class="Apple-converted-space"> </span><br class="">
> Many thanks,<br class="">
> Kaitlin<br class="">
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