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<p class="MsoNormal"><span style="font-size:12.0pt">Yao,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">The ~25-d period variability in the Argentine Basin is described in many papers as being caused by nonlinear eddy interactions with mean flow and topography. Models need sufficient resolution to simulate those
processes. Given the relatively coarse grid of ECCO v4r3, the eddy-driven dynamics relevant for that variability is most likely not well represented in the solution. In this regard, some higher resolution ECCO products (e.g. SOSE, ECCO2) might be more helpful.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">-- <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Courier",serif;color:black">Rui M. Ponte</span><span style="font-size:10.5pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Courier",serif;color:black">Atmospheric and Environmental Research, Inc.</span><span style="font-size:10.5pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Courier",serif;color:black">131 Hartwell Avenue</span><span style="font-size:10.5pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Courier",serif;color:black">Lexington, MA 02421-3126 USA</span><span style="font-size:10.5pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Courier",serif;color:black">781-761-2288 |
<a href="http://www.aer.com">www.aer.com</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></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-bounces@mit.edu> on behalf of ""Wang, Ou" (3244)" <Ou.Wang@jpl.nasa.gov><br>
<b>Reply-To: </b>"ECCO support list, wider membership" <ecco-support@mit.edu><br>
<b>Date: </b>Saturday, July 7, 2018 at 4:39 AM<br>
<b>To: </b>"ECCO support list, wider membership" <ecco-support@mit.edu><br>
<b>Subject: </b>Re: [ecco-support] ECCO V4R3 SSH<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hello Yao,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The satellite altimetry constrain for the most recent 30 iterations or so is only applied to the large-scale features where the model-data misfit is smoothed both spatially and temporarily. This may explain why v4r3 does not have the small
feature you are interested. It would be helpful if you could post a figure showing the comparison you made for the four observational and model products.<br>
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Ou Wang <o:p></o:p></p>
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On Jul 7, 2018, at 12:01 AM, Yao Yu <<a href="mailto:yaoyu.9404@gmail.com">yaoyu.9404@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Dear EECO suport team,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> I am Yao Yu, a graduate student in China. I am writing to inquire about the assimilation of altimetry SSH in the ECCO V4R3 OGCM.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> I am using satellite altimetry measurements, GRACE measurements and two OGCMs (GLORYS2V4 and ECCO V4R3) to analyze an oceanic gyre in the Argentine Basin. However, ECCO failed to reproduce the sought-after feature (~25-day, ~500 km) while
the three others could. I am trying to figure out the reason. I have read about the datasets used in ECCO (<a href="https://urldefense.proofpoint.com/v2/url?u=ftp-3A__ecco.jpl.nasa.gov_Version4_Release3_doc_v4r3-5Fdata.pdf&d=DwMGaQ&c=birp9sjcGzT9DCP3EIAtLA&r=1L8uucM1VfjzQOg3MBsQnQ&m=lCbsvOEQyNPpqCsz6l8SqQmJCM7qor0uZ975iAThJLs&s=NZwC9m2wpmi-Fs_2qRh9r8M62_QbwNkVd-7n0BFteDM&e=" target="_blank">ftp://ecco.jpl.nasa.gov/Version4/Release3/doc/v4r3_data.pdf</a>)
and then Forgot and Ponte (2015) for details about altimeter data. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I'd be grateful if you can help to answer my questions:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">1. Are there any spatial (except for the bin-averaging) and temporal smoothing schema applied to altimeter data? I don't think the nominal 1-degree spatial resolution of ECCO is coarse, however, ECCO's SSH look quite coarse (comparable
with GRACE, ~300km) in the Argentine Basin.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">2. If the answer is no for question 1, then are there any possible reasons that can explain inability of ECCO over the Argentine Basin?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Many thanks!<o:p></o:p></p>
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<div id="m_3740370825578346599gmail-:16u">
<p class="MsoNormal"><span style="border:solid windowtext 1.0pt;padding:0in"><img border="0" width="32" height="32" id="_x0000_i1025" src="cid:Word%20Work%20File%20D.jpg" alt="mage removed by sender."></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="color:#888888">Yao<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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