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<p class="MsoNormal">Hi Aviv,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Essentially yes. ECCO V4 uses a rescaled vertical coordinate (Campin et al., 2008, Ocean Modelling, doi.org/10.1016/j.ocemod.2008.05.005) that would make layer thickness change with time.
<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 <ecco-support-bounces@mit.edu> on behalf of aviv solodoch <avivsolo@gmail.com><br>
<b>Reply-To: </b>"ECCO support list, wider membership" <ecco-support@mit.edu><br>
<b>Date: </b>Monday, August 22, 2022 at 1:42 PM<br>
<b>To: </b>"ecco-support@mit.edu" <ecco-support@mit.edu><br>
<b>Subject: </b>[EXTERNAL] Re: [ecco-support] ecco-support Digest, Vol 78, Issue 3<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Dear Ou<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Thanks for your reply! Just one clarification question please regarding "H(t) is model depth at time t". I'm assuming that the depth relates to the same model vertical column as the OBP cell. Why should the
depth depend on time? Does it include sea surface height?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"garamond",serif">Aviv Solodoch,</span>
<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"garamond",serif">Postdoctoral researcher, </span>
<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"garamond",serif">UCLA,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"garamond",serif">Department of Atmospheric and Oceanic Sciences</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Aug 22, 2022 at 1:15 PM <<a href="mailto:ecco-support-request@mit.edu">ecco-support-request@mit.edu</a>> wrote:<o:p></o:p></p>
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Today's Topics:<br>
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1. ECCOv4r3 OBP units (aviv solodoch)<br>
2. Re: [EXTERNAL] ECCOv4r3 OBP units (Wang, Ou (US 329B))<br>
<br>
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Message: 1<br>
Date: Mon, 22 Aug 2022 22:13:30 +0300<br>
From: aviv solodoch <<a href="mailto:avivsolo@gmail.com" target="_blank">avivsolo@gmail.com</a>><br>
To: <a href="mailto:ecco-support@mit.edu" target="_blank">ecco-support@mit.edu</a><br>
Subject: [ecco-support] ECCOv4r3 OBP units<br>
Message-ID:<br>
<CAPu===NLCuZN3=QYBeB77jCgGkxEjU_U9N+VYf9e=<a href="mailto:9AESZxmKw@mail.gmail.com" target="_blank">9AESZxmKw@mail.gmail.com</a>><br>
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Hello<br>
Can you please let me know what are the ECCOv4r3 units for the OBP<br>
variable? The ECCO output fields document says it is given in meters, but<br>
the actual values at depths of several kms are of order 10s (of meters I<br>
guess) rather than similar in value to the depths. Can you please explain<br>
what kind of conversion was made here?<br>
Regards,<br>
Aviv Solodoch,<br>
Postdoctoral researcher,<br>
UCLA,<br>
Department of Atmospheric and Oceanic Sciences<br>
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Message: 2<br>
Date: Mon, 22 Aug 2022 20:15:24 +0000<br>
From: "Wang, Ou (US 329B)" <<a href="mailto:ou.wang@jpl.nasa.gov" target="_blank">ou.wang@jpl.nasa.gov</a>><br>
To: "ECCO support list, wider membership" <<a href="mailto:ecco-support@mit.edu" target="_blank">ecco-support@mit.edu</a>><br>
Subject: Re: [ecco-support] [EXTERNAL] ECCOv4r3 OBP units<br>
Message-ID: <<a href="mailto:409DC881-01EB-41EC-BBB9-C1FF3A9656B7@jpl.nasa.gov" target="_blank">409DC881-01EB-41EC-BBB9-C1FF3A9656B7@jpl.nasa.gov</a>><br>
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<br>
Hi Aviv,<br>
<br>
ECCO V4r3 OBP files in <a href="https://ecco.jpl.nasa.gov/drive/files/Version4/Release3/nctiles_monthly/OBP" target="_blank">
https://ecco.jpl.nasa.gov/drive/files/Version4/Release3/nctiles_monthly/OBP</a> are in meters. To compare with GRACE data, one would need to remove its area-weighted global ocean mean and also a temporal mean (ideally over the same averaging period GRACE data
use to remove its temporal mean). The meta data has since bee improved in ECCO V4r4. Attached below is the updated meta data for the ECCO V4r4 monthly-mean OBP fields (<a href="https://podaac.jpl.nasa.gov/dataset/ECCO_L4_OBP_LLC0090GRID_MONTHLY_V4R4" target="_blank">https://podaac.jpl.nasa.gov/dataset/ECCO_L4_OBP_LLC0090GRID_MONTHLY_V4R4</a>)
that has detailed description about what exactly the OBP fields are.<br>
<br>
"OBP excludes the contribution from global mean atmospheric pressure and is therefore suitable for comparisons with GRACE data products. OBP is calculated as follows. First, we calculate ocean hydrostatic bottom pressure anomaly, PH<br>
IBOT, with PHIBOT = p_b/rhoConst - gH(t), where p_b = model ocean hydrostatic bottom pressure, rhoConst = reference density (1029 kg m-3), g is acceleration due to gravity (9.81 m s-2), and H(t) is model depth at time t. Then, OBP = PHIBOT/g + corrections for
i) global mean steric sea level changes related to density changes in the Boussinesq volume-conserving model (Greatbatch correction, see sterGloH) and ii) global mean atmospheric pressure variations. Use OBP for comparisons with ocean bottom pressure data
products that have been corrected for global mean atmospheric pressure variations. GRACE data typically ARE corrected for global mean atmospheric pressure variations. In contrast, ocean bottom pressure gauge data typically ARE NOT corrected for global mean
atmospheric pressure variations." ;<br>
<br>
Best,<br>
Ou Wang<br>
<br>
<br>
From: ecco-support <<a href="mailto:ecco-support-bounces@mit.edu" target="_blank">ecco-support-bounces@mit.edu</a>> on behalf of aviv solodoch <<a href="mailto:avivsolo@gmail.com" target="_blank">avivsolo@gmail.com</a>><br>
Reply-To: "ECCO support list, wider membership" <<a href="mailto:ecco-support@mit.edu" target="_blank">ecco-support@mit.edu</a>><br>
Date: Monday, August 22, 2022 at 12:35 PM<br>
To: "<a href="mailto:ecco-support@mit.edu" target="_blank">ecco-support@mit.edu</a>" <<a href="mailto:ecco-support@mit.edu" target="_blank">ecco-support@mit.edu</a>><br>
Subject: [EXTERNAL] [ecco-support] ECCOv4r3 OBP units<br>
<br>
Hello<br>
Can you please let me know what are the ECCOv4r3 units for the OBP variable? The ECCO output fields document says it is given in meters, but the actual values at depths of several kms are of order 10s (of meters I guess) rather than similar in value to the
depths. Can you please explain what kind of conversion was made here?<br>
Regards,<br>
Aviv Solodoch,<br>
Postdoctoral researcher,<br>
UCLA,<br>
Department of Atmospheric and Oceanic Sciences<br>
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