<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">
<div>Dear Yongsu, unfortunately I do not know how to answer your question except to note that (1) anything that has to do with “prior” ECCO uncertainties is very empirical and arbitrary, as you suspect that it is, and (2) we do not yet have full formal posterior
uncertainties for the ECCO solutions.</div>
<div><br>
</div>
<div>Some attempts here:</div>
<div><a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020MS002386">https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020MS002386</a></div>
<div><a href="https://dspace.mit.edu/handle/1721.1/79291">https://dspace.mit.edu/handle/1721.1/79291</a></div>
<div><a href="https://usclivar.org/sites/default/files/meetings/2015/abstracts/HeimbachLooseNguyen_AMOC2018_36698.pdf">https://usclivar.org/sites/default/files/meetings/2015/abstracts/HeimbachLooseNguyen_AMOC2018_36698.pdf</a></div>
<div><a href="https://repository.oceanbestpractices.org/bitstream/handle/11329/1216/130925311.pdf?sequence=1&isAllowed=y">https://repository.oceanbestpractices.org/bitstream/handle/11329/1216/130925311.pdf?sequence=1&isAllowed=y</a></div>
<div><a href="https://www.frontiersin.org/journals/marine-science/articles/10.3389/fmars.2019.00055/full">https://www.frontiersin.org/journals/marine-science/articles/10.3389/fmars.2019.00055/full</a></div>
<div><br>
</div>
<div>I throw your question(s) back to ECCO Support list in case someone else has better answer(s).</div>
<div><br>
</div>
<div>Cheers, Dimitris</div>
<div><br>
</div>
<br>
<blockquote type="cite" style="color: rgb(0, 0, 0);">
<div>On Jul 13, 2024, at 8:45 PM, NA Yongsu <ynaab@connect.ust.hk> wrote:</div>
<br class="Apple-interchange-newline">
<div>
<div dir="ltr">
<div dir="ltr">Dear Dimitris Menemenlis,</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Thanks for reading this email. I'm Yongsu Na, a PhD student at Hong Kong UST. I've been developing a regional state estimate in the South China Sea based on ECCO v4r4.</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">I previously inquired ecco-support about how the uncertainty field of diffkr was computed (<a rel="noreferrer noopener" href="https://urldefense.us/v3/__https://mailman.mit.edu/pipermail/ecco-support/2024-March/000741.html__;!!PvBDto6Hs4WbVuu7!PT3QaF9mkSwjpukwGNvwAE1gsu14mWNmdwdAJXJrM3vibERAF_USuilNsjOYE894DB4BuEHDC7qg6hSkRDDKLJp6$">https://mailman.mit.edu/pipermail/ecco-support/2024-March/000741.html</a>),
but couldn't get a reply. I wonder if you could provide me any clues or hints on it. Thank you in advance.</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Best wishes,</div>
<div dir="ltr">Yongsu Na</div>
</div>
</div>
</blockquote>
<br class="Apple-interchange-newline">
<div><br>
<blockquote type="cite">
<div>On Mar 19, 2024, at 7:06 AM, NA Yongsu <ynaab@connect.ust.hk> wrote:</div>
<br class="Apple-interchange-newline">
<div>
<div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">
<div style="margin: 0cm; font-size: 12pt; font-family: Gulim; background: white;">
<span lang="EN-US" style="font-family: Calibri, sans-serif;">Dear ECCO support team,<o:p></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Gulim; background: white;">
<span lang="EN-US" style="font-family: Calibri, sans-serif;"><o:p> </o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Gulim; background: white;">
<span lang="EN-US" style="font-family: Calibri, sans-serif;">I wonder how the uncertainty fields for the three mixing parameters were produced, and how the bounds (specified in data.ctrl) for them were decided. Are they based on a similar way with producing
the uncertainties of the atmospheric forcings and the initial conditions? All I could find is a short information in Forget et al. (2015). I’d be thankful if you could direct me to some related materials.<o:p></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Gulim; background: white;">
<span lang="EN-US" style="font-family: Calibri, sans-serif;"><o:p> </o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Gulim; background: white;">
<span lang="EN-US" style="font-family: Calibri, sans-serif;">If they are given rather empirically/arbitrarily, will there be any reasonable uncertainty fields for 3d-varying mixing parameters? I’ve been testing a 3d diffkr field produced based on (sparse) observations
for my regional state estimate, but using v4r4’s uncertainty field (with interpolation) seems inappropriate if I expect diffkr to be adjusted in log scale along the iterative optimization (the issue reported in Trossman et al. (2022)). Using larger uncertainties
(e.g. x10 on the 3d diffkr), with bounds to avoid diffkr from going minus, actually allows diffkr to be adjusted in log scale. But with those large uncertainties, there is an issue that the state estimation doesn’t show consistent convergence towards observational
constraints. Any comments would be appreciated!<o:p></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Gulim; background: white;">
<span lang="EN-US" style="font-family: Calibri, sans-serif;"><o:p> </o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Gulim; background: white;">
<span lang="EN-US" style="font-family: Calibri, sans-serif;">Best wishes,<br>
Yongsu Na<o:p></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Gulim; background: white;">
<span lang="EN-US" style="font-family: Calibri, sans-serif;">-----<o:p></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Gulim; background: white;">
<span lang="EN-US" style="font-family: Calibri, sans-serif;">PhD student<br>
Department of Ocean Science<br>
Hong Kong University of Science and Technology<o:p></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Gulim; background: white;">
<span lang="EN-US" style="font-family: Calibri, sans-serif;">----- <o:p></o:p></span></div>
<div style="margin: 0cm; font-size: 12pt; font-family: Gulim; background: white;">
<span lang="EN-US" style="font-family: Calibri, sans-serif;"><o:p> </o:p></span></div>
</div>
<span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">_______________________________________________</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">
<span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">ecco-support
mailing list</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">
<a href="mailto:ecco-support@mit.edu" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">ecco-support@mit.edu</a><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">
<a href="https://urldefense.us/v3/__https://mailman.mit.edu/mailman/listinfo/ecco-support__;!!PvBDto6Hs4WbVuu7!PWA8Yk9NN3hCnQQzKCZiwjVPFe76PVVzXSKkl-WWlmESWU8gC8wc_Av7wMYGmpwKGykWSjo8MBdDgAR90TAPHuFr$" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">https://urldefense.us/v3/__https://mailman.mit.edu/mailman/listinfo/ecco-support__;!!PvBDto6Hs4WbVuu7!PWA8Yk9NN3hCnQQzKCZiwjVPFe76PVVzXSKkl-WWlmESWU8gC8wc_Av7wMYGmpwKGykWSjo8MBdDgAR90TAPHuFr$</a><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;"></span></div>
</blockquote>
</div>
<br>
</body>
</html>