<div dir="ltr">Hong, Ou,<div><br></div><div>Thank you for the explanation. I understand it now.<br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><br></div>Best,<div>Xinfeng</div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Jun 29, 2024 at 7:33 PM <<a href="mailto:ecco-support-request@mit.edu">ecco-support-request@mit.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Send ecco-support mailing list submissions to<br>
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1. Re: [EXTERNAL] Re: ecco-support Digest, Vol 99, Issue 13<br>
(Zhang, Hong (US 398K))<br>
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Message: 1<br>
Date: Sat, 29 Jun 2024 23:33:17 +0000<br>
From: "Zhang, Hong (US 398K)" <<a href="mailto:hong.zhang@jpl.nasa.gov" target="_blank">hong.zhang@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] Re: ecco-support Digest, Vol<br>
99, Issue 13<br>
Message-ID: <<a href="mailto:0DB75568-FA3B-4BA5-8CB0-A599A6E58B19@jpl.nasa.gov" target="_blank">0DB75568-FA3B-4BA5-8CB0-A599A6E58B19@jpl.nasa.gov</a>><br>
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On Jun 29, 2024, at 4:13?PM, Wang, Ou (US 329B) <<a href="mailto:ou.wang@jpl.nasa.gov" target="_blank">ou.wang@jpl.nasa.gov</a>> wrote:<br>
<br>
Hi Xinfeng,<br>
<br>
In terms of z* and the real freshwater flux boundary condition, there is no change between v4r1 and v4r4. The smaller horizontal integral of the Eulerian vertical velocity We (i.e. WVELMASS) in Figure 6 of your paper is probably because you were looking at the time-mean value. I did a quick calculation of the horizontal integrals of WVELMASS for v4r1. The time-mean value is only a few percent of Sv's, one to two orders of magnitude smaller than that for a particular month.<br>
Here is an earlier discussion of WVEL with Carl.<br>
Hope it helps for this theme of discussion.<br>
<br>
An interesting question, but your result and description is exactly what one would expect if I've<br>
understood you.<br>
<br>
Even the twenty year average wvel is noisy (see the Liang etal attachment) particularly at<br>
depth. One slightly troubling numerical problem is that w is computed (as I understand it)<br>
as the residual divergence of the horizontal velocity at any given time---and that's an intrinsically<br>
noisy method.<br>
<br>
Furthermore, in theory at hourly time steps, the internal wave field is in principle present (the<br>
spatial resolution of 1 degree means that it wouldn't be realistic, but the physics should apply). That<br>
field, and see some of the ECCO high resolution results in the other attachment) is known to be almost fully stochastic (tides<br>
aside) and is described by a frequency/wavenumber spectrum (Garrett-Munk). An then at low latitudes,<br>
the 1 degree resolution is probably sufficient to produce an eddy-like field, which is also stochastic.<br>
An interesting question would be what would w look like if you could average for 50 or 500 years?<br>
<br>
<br>
Carl<br>
<br>
<br>
<br>
Hi Carl,<br>
A quick question about Eulerian vertical velocity.<br>
Normally we look at monthly/yearly/decadal mean WVEL<br>
(like fig 18 in your BAMS paper for 20-yr mean WVEL).<br>
But when we look at the hourly or daily mean,<br>
it's surprised that WVEL field looks "messy" (or "grid noisy")<br>
and larger by order of magnitude,<br>
So WVEL must vary rapidly with time and place<br>
and only after much cancellation does it look "normal" (as classical<br>
gyre and upwelling).<br>
Have you touched upon this phenomenon in your papers?<br>
Or are you aware where it is discussed in the literature?<br>
<br>
cheers<br>
Hong<br>
<br>
<br>
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