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<p class="MsoNormal">Hi Zongheng,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The gsExtave field (in psu s^-1) is salinity tendency due to evaporation minus precipitation. To convert gsExtave to virtual salt flux in psu m s^-1, use the follow equation
<o:p></o:p></p>
<p class="MsoNormal">Virtual salt flux (in psu m s^-1) = gsExtave * 10<br>
where 10 is the thickness of the first model layer in meters. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">To convert gsExtave to freshwater flux in m s^-1, use<o:p></o:p></p>
<p class="MsoNormal">Freshwater flux (m s^-1) = -gsExtave * 10 / 35<o:p></o:p></p>
<p class="MsoNormal">where 10 again is the thickness of the first model layer in meters and 35 (psu) is the reference salinity.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The magnitude of freshwater flux converted from gsExtave using the equation above is in the order of 1e-7 m s^-1, which seems right.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I will make the advection tendencies in gradient form available in a couple of weeks.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best,<o:p></o:p></p>
<p class="MsoNormal">Ou<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black"><ecco-support-bounces@mit.edu> on behalf of "lzh6939@stu.ouc.edu.cn" <lzh6939@stu.ouc.edu.cn><br>
<b>Reply-To: </b>"ECCO support list, wider membership" <ecco-support@mit.edu><br>
<b>Date: </b>Wednesday, November 10, 2021 at 7:44 PM<br>
<b>To: </b>"ecco-support@mit.edu" <ecco-support@mit.edu><br>
<b>Subject: </b>[EXTERNAL] [ecco-support] Questions about salinity budget using ECCO near real-time data (dr080)<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<span style="font-size:13.5pt;line-height:150%;font-family:"Times New Roman",serif">Dear ECCO team,</span><o:p></o:p></p>
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<span style="font-size:13.5pt;line-height:150%;font-family:"Times New Roman",serif">I am attempting to use ECCO near real-time data (dr080) to study salinity budget. However, there are some problems in calculation:</span><o:p></o:p></p>
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<span style="font-size:13.5pt;line-height:150%;font-family:"Times New Roman",serif">1. I try to use the sum of gsExtave and gsRelaxave to represent the surface forcing [(E-P)·S / h], but the result is obviously larger than that calculated from the observations.
Could you please show me how to calculate the surface forcing?</span><o:p></o:p></p>
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<span style="font-size:13.5pt;line-height:150%;font-family:"Times New Roman",serif">2. I find in the Readme file that the advection tendencies in gradient form (udS/dx) can be obtained in a separate directory (NON_MOTO), but I didn't find this directory. Can
you tell me how to obtain the advection tendencies in gradient form?</span><o:p></o:p></p>
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<span style="font-size:13.5pt;line-height:150%;font-family:"Times New Roman",serif">Thank you for your kind consideration of this request. Looking forward to your reply.</span><o:p></o:p></p>
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<span style="font-size:13.5pt;line-height:150%;font-family:"Times New Roman",serif">Sincerely,</span><o:p></o:p></p>
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<span style="font-size:13.5pt;line-height:150%;font-family:"Times New Roman",serif">Zongheng Li</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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