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<p class="MsoNormal">Hi Wenrui,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The vertical component of Bolus velocity, WVELSTAR, likely causes the patchiness in the ADVr_SLT plot. ADVr_SLT is partial((WVELMASS+WVELSTAR)*SALT)/partial(z).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best,<o:p></o:p></p>
<p class="MsoNormal">Ou<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">ecco-support <ecco-support-bounces@mit.edu> on behalf of Wenrui Jiang <wjiang33@jhu.edu><br>
<b>Reply-To: </b>"ECCO support list, wider membership" <ecco-support@mit.edu><br>
<b>Date: </b>Friday, June 24, 2022 at 9:25 AM<br>
<b>To: </b>"ecco-support@mit.edu" <ecco-support@mit.edu><br>
<b>Subject: </b>[EXTERNAL] [ecco-support] Patchiness in salt advection diagnostics<o:p></o:p></span></p>
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<p class="MsoNormal"><span class="xxxelementtoproof"><span style="font-size:12.0pt;color:black">Hi,</span></span><span style="font-size:12.0pt;color:black">
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Thanks for reading this email. This question is about the salt advective fluxes in ECCO diagnostics. The out-of-the-box monthly mean vertical salt advection looks something like this.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><img width="581" height="405" style="width:6.052in;height:4.2187in" id="_x0000_i1025" src="cid:image001.png@01D887B5.2A1FB120"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">You can clearly see the lines and patches here as well as in the daily mean diagnostics. However, WVELMASS looks really smooth. I also don't see similar patchiness in other MITgcm output at hand.
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">My question is maybe kind of silly: why is the diagnostic field so patchy?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">I am doing a Lagrangian-budget hybrid study. One of the steps is to emulate the salt fluxed using U and S alone. I came across this problem when I was comparing ADVx_SLT with U*S*dy*dz (I also
tried to estimate the flux with daily mean U and S using the DST3method). I realized that their difference is large, looks patchy, and is not quite correlated with du/dx or dv/dy. I would be happy to share my other attempts to understand it.
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span class="xxxelementtoproof"><span style="font-size:12.0pt;color:black">P.S. I can close the budget with the patchy diagnostic because advective fluxes in all 3 dimensions are patchy and they sort of cancel each other out.</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:16.0pt;color:#0C882A">Wenrui Jiang</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Ph.D. Student,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Department of Earth & Planetary Sciences,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Johns Hopkins University.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Email: wjiang33@jh.edu<o:p></o:p></span></p>
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