[ecco-support] [EXTERNAL] Difference in sea surface salinity regarding the ECCO v4r3 and v4r4

[Fenty, Ian G (US 329C)]

Hao,

You are correct in your guesses: profiles were reweighted between v4r3 and v4r4 and new data were added from gliders and moorings.  However, the differences in your plot seem to be rather large.   We’ll take a closer look and see if there is another explanation.

Unrelated to your question, the ‘stripe’ patterns in plot may be due to the different interpolation scheme.  These v4r4 lat-lon fields are taken from the ‘nearest neighbor’ from the model grid while the lat-lon fields from v4r3 may have been calculated using bilinear interpolation.

Ian




From: <ecco-support-bounces at mit.edu> on behalf of 刘浩 <lhao at fio.org.cn>
Reply-To: "ECCO support list, wider membership" <ecco-support at mit.edu>
Date: Thursday, February 6, 2020 at 8:47 AM
To: "ecco-support at mit.edu" <ecco-support at mit.edu>
Subject: [EXTERNAL] [ecco-support] Difference in sea surface salinity regarding the ECCO v4r3 and v4r4


Hi, ECCO producers



I has downloaded salinity data from folders interp_monthly of the ECCO v4r3 and v4r4, and I noticed the two sets of data shows large differences in all individual years(for example, SSS over 2001 is shown in the attachment). I wonder what causes the large differece? Is it because new observation introduced (gliders, moorings)? Or profiles is re-weighted? Or else？





Best,Regrads, HAO LIU


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