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<p class="MsoNormal"><span style="font-size:11.0pt">Hi Ashfaq,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">V4r4 represents large-scale circulation and does not resolve eddies<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">which likely accounts for the difference you see in your plots.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Do you have any plots comparing sea ice drift you can share?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Ichiro<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:"Calibri",sans-serif;color:black">From:
</span></b><span style="font-family:"Calibri",sans-serif;color:black">ecco-support <ecco-support-bounces@mit.edu> on behalf of "Ahmed, Ashfaq" <ashfaq_ahmed@brown.edu><br>
<b>Reply-To: </b>"ECCO support list, wider membership" <ecco-support@mit.edu><br>
<b>Date: </b>Wednesday, May 28, 2025 at 9:23 AM<br>
<b>To: </b>"ECCO support list, wider membership" <ecco-support@mit.edu>, "Wang, Ou (US 329B)" <ou.wang@jpl.nasa.gov><br>
<b>Subject: </b>Re: [ecco-support] [EXTERNAL] Data for ocean current<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">Dear Dr. Ou, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thank you for sharing the data summary—it was very helpful! I’m currently looking for a time series dataset of Arctic Ocean surface currents (preferably, spanning multiple years). As I was analyzing Arctic near-surface kinematics in ECCOv4r4,
I observed that the sea ice drift appears to be faster than in some observational records. To better understand this bias, I’m now comparing ECCOv4r4’s ocean surface velocity with observational datasets.<br>
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My hypothesis is that if the modeled ocean currents are also stronger than observed, it could suggest that wind momentum flux is overly influential in the model. On the other hand, if ECCOv4r4 currents are weaker than observations, it may indicate the presence
of compensating processes or parameters that are moderating the wind drag.<br>
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I’ve already calculated the near-surface kinetic energy and compared it with in situ observations from von Appen et al. (2024). Initial results suggest that ECCOv4r4 underestimates the ocean kinetic energy.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><img width="554" height="562" style="width:5.7708in;height:5.8541in" id="_x0000_i1025" src="cid:image001.png@01DBD631.747CA930"><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 would greatly appreciate any recommendations or insights you might have regarding suitable datasets or relevant approaches for this comparison. I’m also cc’ing Dr. Ian here in case he has any suggestions to add.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best,<o:p></o:p></p>
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<p class="MsoNormal">_________________<o:p></o:p></p>
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<p class="MsoNormal"><b>Ashfaq Ahmed</b><o:p></o:p></p>
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<p class="MsoNormal">Ph.D. Candidate<o:p></o:p></p>
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<p class="MsoNormal">Center for Fluid Mechanics<o:p></o:p></p>
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<p class="MsoNormal">Brown University<o:p></o:p></p>
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<p class="MsoNormal">Providence, Rhode Island, USA 02912<o:p></o:p></p>
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<p class="MsoNormal">website: <a href="https://urldefense.us/v3/__http:/ahmedashfaq.com__;!!PvBDto6Hs4WbVuu7!KK9yHvHgrTMy0a1plSjHoU3p5M03UQ6bNtgbSTg7INHreoi4pC2lyQR4oUASO2RqXQRVmJ_p9JMUAYCN3xvKu0CcmYUcKw$" target="_blank">
ahmedashfaq.com</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, May 28, 2025 at 11:41<span style="font-family:"Arial",sans-serif"> </span>AM Wang, Ou (US 329B) <<a href="mailto:ou.wang@jpl.nasa.gov">ou.wang@jpl.nasa.gov</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt">Hi Ashfaq,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt">The ECCO V4r4 synopsis (<a href="https://urldefense.us/v3/__https:/zenodo.org/records/4533349__;!!PvBDto6Hs4WbVuu7!KK9yHvHgrTMy0a1plSjHoU3p5M03UQ6bNtgbSTg7INHreoi4pC2lyQR4oUASO2RqXQRVmJ_p9JMUAYCN3xvKu0AqxYB_bw$" target="_blank">https://zenodo.org/records/4533349</a>)
has the list of observations used to constrain V4r4. </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt">Best,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt">Ou</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">ecco-support <<a href="mailto:ecco-support-bounces@mit.edu" target="_blank">ecco-support-bounces@mit.edu</a>> on behalf of Ahmed, Ashfaq <<a href="mailto:ashfaq_ahmed@brown.edu" target="_blank">ashfaq_ahmed@brown.edu</a>><br>
<b>Date: </b>Wednesday, May 28, 2025 at 8:12</span><span style="font-family:"Arial",sans-serif;color:black"> </span><span style="color:black">AM<br>
<b>To: </b>ECCO support list, wider membership <<a href="mailto:ecco-support@mit.edu" target="_blank">ecco-support@mit.edu</a>><br>
<b>Subject: </b>[EXTERNAL] [ecco-support] Data for ocean current</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi all!<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I have a quick question. I wanted to look for which data was assimilated in ECCOv4r4 to produce the
<a href="https://podaac.jpl.nasa.gov/dataset/ECCO_L4_OCEAN_VEL_LLC0090GRID_DAILY_V4R4" target="_blank">
ocean velocity</a> (UVEL, VVEL, WVEL). For example, the list of Argo, CTD, XBT, ITP, etc. Can anyone please tell me? <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">It will be a great help. Thank you so much!<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#222222;border:solid windowtext 1.0pt;padding:0in"><b>Error! Filename not specified.</b></span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif;color:black">Thanks, </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-family:"Arial",sans-serif;color:black">Ashfaq Ahmed</span></b><span style="font-family:"Arial",sans-serif;color:black"> (he/his)</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif;color:black">Doctoral Candidate,</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif;color:#0B5394"><a href="https://urldefense.us/v3/__https:/engineering.brown.edu/people/graduate-students/phd-students/phd-students-fluids-and-thermal-sciences__;!!PvBDto6Hs4WbVuu7!O-w96S37k1Y7WYeR5xgtJh3Y429RjWbBRO9-uhh2P6kYvwEaT3u_r_8wjqSNFZrKgqIkBbZe5nTHmIN5JfFZXt0045jG$" target="_blank"><span style="color:#1155CC">Center
for Fluids and Thermal Science</span></a></span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif;color:black">School of Engineering, Brown University</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif;color:black">Email:</span><span style="font-family:"Arial",sans-serif;color:#0B5394"> </span><span style="font-family:"Arial",sans-serif;color:#222222"><a href="mailto:ramisa_fariha@brown.edu" target="_blank"><span style="color:#0B5394">ashfaq_ahmed@brown.edu</span></a></span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-family:"Arial",sans-serif;color:black">Profile Links:</span></b><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-family:"Arial",sans-serif;color:black"><a href="https://urldefense.us/v3/__https:/www.linkedin.com/in/ashfaqahmed40/__;!!PvBDto6Hs4WbVuu7!O-w96S37k1Y7WYeR5xgtJh3Y429RjWbBRO9-uhh2P6kYvwEaT3u_r_8wjqSNFZrKgqIkBbZe5nTHmIN5JfFZXmzwDwXt$" target="_blank"><span style="color:#1155CC">LinkedIn</span></a> | <a href="https://urldefense.us/v3/__https:/ahmedashfaq.com/__;!!PvBDto6Hs4WbVuu7!O-w96S37k1Y7WYeR5xgtJh3Y429RjWbBRO9-uhh2P6kYvwEaT3u_r_8wjqSNFZrKgqIkBbZe5nTHmIN5JfFZXgDiNI6H$" target="_blank"><span style="color:#1155CC">Website</span></a> | <a href="https://urldefense.us/v3/__https:/scholar.google.com/citations?user=iiSUYgsAAAAJ&hl=en&authuser=1__;!!PvBDto6Hs4WbVuu7!O-w96S37k1Y7WYeR5xgtJh3Y429RjWbBRO9-uhh2P6kYvwEaT3u_r_8wjqSNFZrKgqIkBbZe5nTHmIN5JfFZXlDBtsf8$" target="_blank"><span style="color:#1155CC">Google
Scholar</span></a> | <a href="https://urldefense.us/v3/__https:/www.researchgate.net/profile/Ashfaq-Ahmed-15__;!!PvBDto6Hs4WbVuu7!O-w96S37k1Y7WYeR5xgtJh3Y429RjWbBRO9-uhh2P6kYvwEaT3u_r_8wjqSNFZrKgqIkBbZe5nTHmIN5JfFZXgZmBG_S$" target="_blank"><span style="color:#1155CC">ResearchGate</span></a></span></b><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#222222">Providence, Rhode Island, USA</span><o:p></o:p></p>
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