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Don’t know what criterion was used for ECCOv4
<div class="">For cube92, the default parameters were used:</div>
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<div class="">C hMixCriteria:: criteria for mixed-layer diagnostic</div>
<div class="">C dRhoSmall :: parameter for mixed-layer diagnostic</div>
<div class="">C hMixSmooth :: Smoothing parameter for mixed-layer diag (default=0=no smoothing)</div>
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<div class=""> hMixCriteria = -.8 _d 0</div>
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<div class=""> dRhoSmall = 1. _d -6</div>
<div class=""> hMixSmooth = 0. _d 0</div>
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<div class="">C-- First method :</div>
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<div class="">C where the potential density (ref.lev=surface) is larger than</div>
<div class="">C surface density plus Delta_Rho = hMixCriteria * Alpha(surf)</div>
<div class="">C = density of water which is -hMixCriteria colder than surface water</div>
<div class="">C (see Kara, Rochford, and Hurlburt JGR 2000 for default criterion)</div>
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<div class="">See model/src/calc_oce_mxlayer for other options.</div>
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<div class="">Another available definition (when using KPP scheme)</div>
<div class="">is KPPhbl, which is the “mixing” layer depth.</div>
<div class="">The daily maximum of KPPhbl is a very good proxy for</div>
<div class="">mixed layer depth most places, except seasonally-sea-ice-covered and polar-winter regions.</div>
<div class="">(Kara’s criterion is also problematic for polar regions, which tend to be salt-stratified.)</div>
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<blockquote type="cite" class="">
<div class="">On May 1, 2017, at 9:50 AM, Martha Buckley <<a href="mailto:marthabuckley@gmail.com" class="">marthabuckley@gmail.com</a>> wrote:</div>
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<div dir="ltr" class="">One follow up question regarding mixed layer depths in ECCO.
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<div class="">What is the criteria for the variable "MXLDEPTH" in the ecco v4 product. I think I recall being told it is the density equivalent of 0.8C. Two questions:</div>
<div class="">(1) Is this the criteria that was used? It the criteria applied to model profiles at the model timestep?</div>
<div class="">(2) If so, isn't this criteria a bit large? 0.125 kg/m^3 or 0.5C seem common MLD criteria when applying criteria to monthly-averaged data. However, criteria that are smaller (~0.03 kg/m^3 or ~0.2 C) are typically applied when using raw observational
profiles. </div>
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<div class="">I know that the MLD criteria is somewhat arbitrary, but I want an idea of the rational for the chosen criteria. </div>
<div class="">Thanks!</div>
<div class="">Martha</div>
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<div class="gmail_quote">On Fri, Apr 28, 2017 at 6:04 PM, HONG ZHANG <span dir="ltr" class="">
<<a href="mailto:hong.zhang@ucla.edu" target="_blank" class="">hong.zhang@ucla.edu</a>></span> wrote:<br class="">
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<th align="RIGHT" valign="BASELINE" nowrap="" class="">Subject: </th>
<td class="">Re: [ecco-support] ECCO2 Mixed Layer Depths Concerns</td>
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<th align="RIGHT" valign="BASELINE" nowrap="" class="">Date: </th>
<td class="">Fri, 28 Apr 2017 12:48:59 -0700</td>
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<th align="RIGHT" valign="BASELINE" nowrap="" class="">From: </th>
<td class="">HONG ZHANG <a class="m_-7993531269458287600moz-txt-link-rfc2396E" href="mailto:hong.zhang@ucla.edu" target="_blank">
<hong.zhang@ucla.edu></a></td>
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<th align="RIGHT" valign="BASELINE" nowrap="" class="">To: </th>
<td class="">Dimitris Menemenlis <a class="m_-7993531269458287600moz-txt-link-rfc2396E" href="mailto:dmenemenlis@gmail.com" target="_blank">
<dmenemenlis@gmail.com></a>, Moisan, John R. (WFF-610W) <a class="m_-7993531269458287600moz-txt-link-rfc2396E" href="mailto:john.r.moisan@nasa.gov" target="_blank">
<john.r.moisan@nasa.gov></a></td>
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<th align="RIGHT" valign="BASELINE" nowrap="" class="">CC: </th>
<td class="">Daria Halkides <a class="m_-7993531269458287600moz-txt-link-rfc2396E" href="mailto:halkides@esr.org" target="_blank">
<halkides@esr.org></a></td>
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<div class="m_-7993531269458287600moz-cite-prefix">On 4/28/17 9:37 AM, Dimitris Menemenlis wrote:<br class="">
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<blockquote type="cite" class="">Daria or Hong, would you have looked at MXLDEPTH depth in the “cube92” solution?
<div class=""><a href="ftp://ecco2.jpl.nasa.gov/data1/cube/cube92/lat_lon/quart_90S_90N/MXLDEPTH.nc/" target="_blank" class="">ftp://ecco2.jpl.nasa.gov/<wbr class="">data1/cube/cube92/lat_lon/<wbr class="">quart_90S_90N/MXLDEPTH.nc/</a></div>
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<div class="">John, why not use the ECCO-V4, which is data-constrained?</div>
<div class=""><a href="http://www.ecco-group.org/products.htm" target="_blank" class="">http://www.ecco-group.org/<wbr class="">products.htm</a></div>
<div class="">ECCO v4 is on a 1-degree grid, which is closer to your desired 2x2 degree grid.</div>
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<div class="">Dimitris Menemenlis </div>
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<div class="">On Apr 26, 2017, at 9:41 AM, Moisan, John R. (WFF-610W) <<a href="mailto:john.r.moisan@nasa.gov" target="_blank" class="">john.r.moisan@nasa.gov</a>> wrote:</div>
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<div class="m_-7993531269458287600PlainText">Hello ECCO2’ers,<br class="">
<br class="">
I would like to make use of the Mixed-Layer Depth model outputs from the global model runs 1992-present (Nov. 2016) to drive some simple 1D biogeochemical models for CDOM. I have binned to model outputs from the jpg site into monthly 2x2 deg. grids. One thing
of concern that I have is the trends in the global MLDs (see attached figure), which are more extreme in the SO. Is there an issue with maintaining correct ocean boundary layers, esp. in the SO for this model? Has this been observed yet?<br class="">
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<font size="2" class="">Hi John,<br class="">
You're right, MLD from cube92 run has bias in late stage<br class="">
because it's a free run for the later period.<br class="">
As Dimitris said, you can look at other ECCO product provided at the website.<br class="">
Please see attached fig showing MLD from ECCOv4 and ECCO llc270 for an example,<br class="">
where red line is for ECCOv4 (1992-2012) and blue line for ECCO llc270 (2001-2015) in upper plot<br class="">
also MLD for cube92 is also shown in lower plot for reference.<br class="">
</font><br class="">
cheers<br class="">
Hong<br class="">
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-- <br class="">
<div class="gmail_signature" data-smartmail="gmail_signature">Martha W. Buckley<br class="">
<a href="mailto:marthabuckley@gmail.com" target="_blank" class="">marthabuckley@gmail.com</a><br class="">
<a href="http://sites.google.com/site/marthabuckley/home" target="_blank" class="">http://sites.google.com/site/marthabuckley/home</a><br class="">
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