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Hi Jiatong,<br>
<br>
I am not an expert on turbulence nor coding, so please only take my advice as a grain of salt. If your "noise" varies on grid scales and you have tried increasing the resolution, then I suppose they may very likely be grid scale noise. Also note in MITgcm,
the bathymetry is in fact zigzagged, which may create some artificial noise. On the other hand, your bathymetry seems pretty rough? And turbulence is expected? So your noise could be a combination of the turbulence and the grid scale noise?<br>
<br>
Hope this helps a bit.<br>
<br>
Yangxin
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> MITgcm-support <mitgcm-support-bounces@mitgcm.org> on behalf of JIATONG <jiatong@radi.ac.cn><br>
<b>Sent:</b> Thursday, December 26, 2019 10:36:34 PM<br>
<b>To:</b> mitgcm-support<br>
<b>Subject:</b> Re: [MITgcm-support] noise near the bottom</font>
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<div><span></span>Hi <span style="color: rgb(0, 0, 0); font-size: 10.5pt; line-height: 1.5; background-color: rgba(0, 0, 0, 0);">Yangxin,</span></div>
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<div><span style="color: rgb(0, 0, 0); font-size: 10.5pt; line-height: 1.5; background-color: rgba(0, 0, 0, 0);"> Thank</span><span style="line-height: 1.5;">s for you</span><span style="line-height: 1.5;">r reply. Yes, Jody has replied to me. </span><span style="font-size: 10.5pt; line-height: 1.5; background-color: transparent;">I
will try the </span><span style="color: rgb(0, 0, 0); font-size: 10.5pt; line-height: 1.5; background-color: rgba(0, 0, 0, 0);">Advection scheme 33 to see if the results turn out better. </span></div>
<div><span style="font-size: 10.5pt; line-height: 1.5; background-color: transparent;"> However, as I write to </span><span style="font-size: 10.5pt; line-height: 1.5; background-color: transparent;">Jody, I am confused by the depressions </span><span style="color: rgb(0, 0, 0); font-size: 10.5pt; line-height: 1.5; background-color: rgba(0, 0, 0, 0);">apart from isotherms.
Are they all </span><span style="color: rgb(0, 0, 0); font-size: 10.5pt; line-height: 1.5; background-color: rgba(0, 0, 0, 0);">turbulence? or </span><span style="color: rgb(0, 0, 0); font-size: 10.5pt; line-height: 1.5; background-color: rgba(0, 0, 0, 0);">grid-scale noise? </span></div>
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<pre style="white-space: pre-wrap; font-variant-ligatures: normal; orphans: 2; widows: 2;"><font face="΢ÈíÑźÚ"> </font><span style="color: rgb(0, 0, 0); font-family: ΢ÈíÑźÚ; font-size: 10.5pt; line-height: 1.5; background-color: rgba(0, 0, 0, 0);">Thanks a lot for all your help!</span></pre>
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<div>JIATONG</div>
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