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Hi Anthony,</div>
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SFLUX is appropriate for closing the salt budget. The global ocean surface area integral of SFLUX matches the time-derivative of total ocean salt content.</div>
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The two descriptions are intended to convey the same thing. We will revise one or both descriptions to improve clarity. </div>
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Best,</div>
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Ou </div>
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<b>From: </b>ecco-support <ecco-support-bounces@mit.edu> on behalf of Anthony Meza <ameza@mit.edu><br>
<b>Date: </b>Thursday, February 19, 2026 at 7:48 PM<br>
<b>To: </b>ecco-support <ecco-support@mit.edu><br>
<b>Subject: </b>[EXTERNAL] [ecco-support] Salt/salinity budget closure in ECCO V4r4<br>
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Hi all, </div>
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I had a question about the salt/salinity budget closure in ECCO V4r4. The ECCO V4r4 tutorial says that "SFLUX" is
<span style="color: rgb(0, 120, 215);"><a href="https://urldefense.us/v3/__https://ecco-v4-python-tutorial.readthedocs.io/ECCO_v4_Salt_and_salinity_budget.html__;!!PvBDto6Hs4WbVuu7!PngytV6-_8w8tZqzSpmozFQZe5AR6MjXxwpSSJMa6n_3PJg2iWxuKWpT0Pr-LrUVO7oUcEgwofyNFY7Wfw$" title="https://ecco-v4-python-tutorial.readthedocs.io/ECCO_v4_Salt_and_salinity_budget.html" data-outlook-id="1099a42f-d572-43f6-9e0d-086f8d5c0d27" data-ogsc="rgb(0, 120, 215)" style="color: rgb(0, 120, 215);">total
salt flux (match salt-content variations) (g/m^2/s)</a></span>. However, the corresponding diagnostics document says that SFLUX is "<span style="color: rgb(0, 120, 215);"><a href="https://urldefense.us/v3/__https://raw.githubusercontent.com/ECCO-GROUP/ECCO-ACCESS/refs/heads/main/varlist/v4r4/v4r4_nctiles_monthly_varlist.txt__;!!PvBDto6Hs4WbVuu7!PngytV6-_8w8tZqzSpmozFQZe5AR6MjXxwpSSJMa6n_3PJg2iWxuKWpT0Pr-LrUVO7oUcEgwofxiuofHIA$" title="https://raw.githubusercontent.com/ECCO-GROUP/ECCO-ACCESS/refs/heads/main/varlist/v4r4/v4r4_nctiles_monthly_varlist.txt" data-outlook-id="793c5e25-c3ed-4854-91cb-ea2a3dd9a647" data-ogsc="rgb(0, 120, 215)" style="color: rgb(0, 120, 215);">Rate
of change of total ocean salinity per m^2 accounting for mass fluxes (g/(m^2 s)</a></span>)</div>
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These are quite different. Which is accurate? Is SFLUX still appropriate for closing the salt budget, or should it have the freshwater flux component removed? </div>
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Sincerely, </div>
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Anthony</div>
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<span style="font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 11pt;">————————————</span></p>
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<span style="font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 11pt; color: black;"><b>Anthony Meza</b> (he/him)</span></p>
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<span style="font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 11pt; color: black;">PhD Candidate</span></p>
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<span style="font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 11pt; color: black;">Physical Oceanography</span></p>
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<span style="font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(192, 0, 0);">MIT</span><span style="font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 11pt; color: black;">-</span><span style="font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 112, 192);">WHOI</span><span style="font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 11pt; color: black;"> Joint
Program</span><span style="font-family: Aptos, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(33, 33, 33);"> </span></p>
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