<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Yes, we are currently evaluating the implementation of stokes velocity in the MITgcm. Rui Sun here at SIO is leading the work. <div class="">As Dimitris says, it is not currently included in the ECCO products, though it is possible the adjusted wind stresses and mixing coefficients that ECCO uses to optimize the ocean solution do represent some of these physics. </div><div class=""><br class=""></div><div class="">In direct response to your question, yes, it does make sense for you to add the Stokes velocity. This may give you a more accurate surface velocity. It will, however, break the momentum budget. </div><div class=""><br class=""></div><div class="">Matt</div><div class=""><br class=""></div><div class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Mar 13, 2021, at 8:49 AM, Dimitris Menemenlis <<a href="mailto:menemenlis@jpl.nasa.gov" class="">menemenlis@jpl.nasa.gov</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; 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;" class="">Dear Maxime, Stokes drift is definitely not included in the ECCO2 simulation that you refer to below nor, as far as I know, in any existing ECCO simulation.</span><div class="" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; 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 class=""><br class=""></div><div class="">A possible, very indirect way, in which Stokes drift is included, is that the corrections applied to ECCO solutions in order to fit available observations may wrap a little bit of the consequences of Stoke’s drift in other terms, for example, surface wind stress.</div><div class=""><br class=""></div><div class="">Scripps is working on including WW3 in regional ECCO solutions. I cc Matt Mazloff, who may have more to say on this topic.<br class=""></div><div class=""><br class=""></div><div class="">Best regards, Dimitris</div><div class=""><div class=""><div class=""><br class=""></div><div class=""><br class=""><blockquote type="cite" class=""><div class="">On Mar 10, 2021, at 1:03 AM, Maxime Mouyen <<a href="mailto:maxime.mouyen@chalmers.se" class="">maxime.mouyen@chalmers.se</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div id="divtagdefaultwrapper" dir="ltr" class="" style="font-style: normal; font-variant-caps: normal; font-weight: normal; 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; font-size: 12pt; font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols;"><div class="" style="margin-top: 0px; margin-bottom: 0px;">Dear Ecco team,</div><div class="" style="margin-top: 0px; margin-bottom: 0px;"><br class=""></div><div class="" style="margin-top: 0px; margin-bottom: 0px;"><span class="">Does it make sense to add Stokes drift velocities (wind-correlated drift of surface waters) to the ECCO2 surface velocity? Or does ECCO2 already account for such effects?</span><br class=""></div><div class="" style="margin-top: 0px; margin-bottom: 0px;"><span class="">(I'm using these products: <a href="https://urldefense.com/v3/__https://ecco.jpl.nasa.gov/drive/files/ECCO2/cube92_latlon_quart_90S90N/WVEL.nc__;!!Mih3wA!X83lZoc2EIFKyEEzPLUBO7GuUrpm3cAagzbmETRPdvujiqOyrA0LnrDgG16MV5lwBw$" class="OWAAutoLink" id="LPlnk579875" previewremoved="true">https://ecco.jpl.nasa.gov/drive/files/ECCO2/cube92_latlon_quart_90S90N/WVEL.nc</a>, VVEL.nc and UVEL.nc)</span></div><div class="" style="margin-top: 0px; margin-bottom: 0px;"><span class=""><br class=""></span></div><div class="" style="margin-top: 0px; margin-bottom: 0px;"><span class="">I<span class="Apple-converted-space"> </span><a href="https://urldefense.com/v3/__https://urldefense.us/v3/__https:/*agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JC014453__;!!PvBDto6Hs4WbVuu7!byy0rl83ps-3nyLI-Uaf_QuOrnkom49kBVrgqoU-Nd9cqYdA4qrYZ3mdTyhoLO61ZDyx$__;Lw!!Mih3wA!X83lZoc2EIFKyEEzPLUBO7GuUrpm3cAagzbmETRPdvujiqOyrA0LnrDgG15esjoTmA$" class="OWAAutoLink">read</a><span class="Apple-converted-space"> </span>that the <span class="">MITgcm used in ECCO2 "<span class="">does not include representation of surface waves" but I cannot make clear if the ECCO2 products mentioned above are subsequently forced by winds.</span></span></span></div><div class="" style="margin-top: 0px; margin-bottom: 0px;"><br class=""></div><div class="" style="margin-top: 0px; margin-bottom: 0px;">Thanks for your help on this matter and for providing such useful products.</div><div class="" style="margin-top: 0px; margin-bottom: 0px;"><br class=""></div><div class="" style="margin-top: 0px; margin-bottom: 0px;">Best regards,</div><div class="" style="margin-top: 0px; margin-bottom: 0px;">Maxime </div><div class="" style="margin-top: 0px; margin-bottom: 0px;"><br class=""></div><div class="" style="margin-top: 0px; margin-bottom: 0px;"><br class=""></div><div id="Signature" class=""><div id="divtagdefaultwrapper" dir="ltr" class=""><div class="" style="margin-top: 0px; margin-bottom: 0px;"><span class="" style="color: rgb(117, 123, 128);">----</span></div><span class="" style="color: rgb(117, 123, 128);"></span><div class="" style="margin-top: 0px; margin-bottom: 0px;"><span class="" style="color: rgb(117, 123, 128);">Maxime Mouyen</span></div><span class="" style="color: rgb(117, 123, 128);"></span><div class="" style="margin-top: 0px; margin-bottom: 0px;"><span class="" style="color: rgb(117, 123, 128);">Chalmers University of Technologyo</span><br class=""><span class="" style="color: rgb(117, 123, 128);"></span></div><span class="" style="color: rgb(117, 123, 128);"></span><p class="" style="margin-top: 0px; margin-bottom: 0px;"></p><span class="" style="color: rgb(117, 123, 128);"></span><div class=""><span class="" style="color: rgb(117, 123, 128);">Tel: +46 31 772 5549</span></div><span class="" style="color: rgb(117, 123, 128);"></span><p class="" style="margin-top: 0px; margin-bottom: 0px;"></p><span class="" style="color: rgb(117, 123, 128);"></span><div class="" style="margin-top: 0px; margin-bottom: 0px;"><span class="" style="color: rgb(117, 123, 128);">Onsala rymdobservatorium</span></div><span class="" style="color: rgb(117, 123, 128);"></span><div class="" style="margin-top: 0px; margin-bottom: 0px;"><span class="" style="color: rgb(117, 123, 128);">Observatorievägen 90, 439 92 Onsala, Sweden.</span></div><span class="" style="color: rgb(117, 123, 128);"></span><div class="" style="margin-top: 0px; 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