[ecco-support] [EXTERNAL] Data for ocean current

Thu Jun 5 18:49:46 EDT 2025

Hi Ashfaq,

V4r4 represents large-scale circulation and does not resolve eddies
which likely accounts for the difference you see in your plots.

Do you have any plots comparing sea ice drift you can share?

Regards,
Ichiro

From: ecco-support <ecco-support-bounces at mit.edu> on behalf of "Ahmed, Ashfaq" <ashfaq_ahmed at brown.edu>
Reply-To: "ECCO support list, wider membership" <ecco-support at mit.edu>
Date: Wednesday, May 28, 2025 at 9:23 AM
To: "ECCO support list, wider membership" <ecco-support at mit.edu>, "Wang, Ou (US 329B)" <ou.wang at jpl.nasa.gov>
Subject: Re: [ecco-support] [EXTERNAL] Data for ocean current

Dear Dr. Ou,

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.

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.

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.

[cid:image001.png at 01DBD631.747CA930]

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.

Best,
_________________
Ashfaq Ahmed
Ph.D. Candidate
Center for Fluid Mechanics
Brown University
Providence, Rhode Island, USA 02912
website: ahmedashfaq.com<https://urldefense.us/v3/__http:/ahmedashfaq.com__;!!PvBDto6Hs4WbVuu7!KK9yHvHgrTMy0a1plSjHoU3p5M03UQ6bNtgbSTg7INHreoi4pC2lyQR4oUASO2RqXQRVmJ_p9JMUAYCN3xvKu0CcmYUcKw$>

On Wed, May 28, 2025 at 11:41 AM Wang, Ou (US 329B) <ou.wang at jpl.nasa.gov<mailto:ou.wang at jpl.nasa.gov>> wrote:
Hi Ashfaq,

The ECCO V4r4 synopsis (https://zenodo.org/records/4533349<https://urldefense.us/v3/__https:/zenodo.org/records/4533349__;!!PvBDto6Hs4WbVuu7!KK9yHvHgrTMy0a1plSjHoU3p5M03UQ6bNtgbSTg7INHreoi4pC2lyQR4oUASO2RqXQRVmJ_p9JMUAYCN3xvKu0AqxYB_bw$>) has the list of observations used to constrain V4r4.

Best,
Ou

From: ecco-support <ecco-support-bounces at mit.edu<mailto:ecco-support-bounces at mit.edu>> on behalf of Ahmed, Ashfaq <ashfaq_ahmed at brown.edu<mailto:ashfaq_ahmed at brown.edu>>
Date: Wednesday, May 28, 2025 at 8:12 AM
To: ECCO support list, wider membership <ecco-support at mit.edu<mailto:ecco-support at mit.edu>>
Subject: [EXTERNAL] [ecco-support] Data for ocean current
Hi all!

I have a quick question. I wanted to look for which data was assimilated in ECCOv4r4 to produce the ocean velocity<https://podaac.jpl.nasa.gov/dataset/ECCO_L4_OCEAN_VEL_LLC0090GRID_DAILY_V4R4> (UVEL, VVEL, WVEL). For example, the list of Argo, CTD, XBT, ITP, etc. Can anyone please tell me?

It will be a great help. Thank you so much!

Error! Filename not specified.
Thanks,
Ashfaq Ahmed (he/his)
Doctoral Candidate,
Center for Fluids and Thermal Science<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$>
School of Engineering, Brown University
Email: ashfaq_ahmed at brown.edu<mailto:ramisa_fariha at brown.edu>
Profile Links:
LinkedIn<https://urldefense.us/v3/__https:/www.linkedin.com/in/ashfaqahmed40/__;!!PvBDto6Hs4WbVuu7!O-w96S37k1Y7WYeR5xgtJh3Y429RjWbBRO9-uhh2P6kYvwEaT3u_r_8wjqSNFZrKgqIkBbZe5nTHmIN5JfFZXmzwDwXt$> | Website<https://urldefense.us/v3/__https:/ahmedashfaq.com/__;!!PvBDto6Hs4WbVuu7!O-w96S37k1Y7WYeR5xgtJh3Y429RjWbBRO9-uhh2P6kYvwEaT3u_r_8wjqSNFZrKgqIkBbZe5nTHmIN5JfFZXgDiNI6H$> | Google Scholar<https://urldefense.us/v3/__https:/scholar.google.com/citations?user=iiSUYgsAAAAJ&hl=en&authuser=1__;!!PvBDto6Hs4WbVuu7!O-w96S37k1Y7WYeR5xgtJh3Y429RjWbBRO9-uhh2P6kYvwEaT3u_r_8wjqSNFZrKgqIkBbZe5nTHmIN5JfFZXlDBtsf8$> | ResearchGate<https://urldefense.us/v3/__https:/www.researchgate.net/profile/Ashfaq-Ahmed-15__;!!PvBDto6Hs4WbVuu7!O-w96S37k1Y7WYeR5xgtJh3Y429RjWbBRO9-uhh2P6kYvwEaT3u_r_8wjqSNFZrKgqIkBbZe5nTHmIN5JfFZXgZmBG_S$>
Providence, Rhode Island, USA

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