[ecco-support] ECCO V4R3 SSH

Sat Jul 7 04:39:46 EDT 2018

Hello Yao,

The satellite altimetry constrain for the most recent 30 iterations or so is only applied to the large-scale features where the model-data misfit is smoothed both spatially and temporarily. This may explain why v4r3 does not have the small feature you are interested. It would be helpful if you could post a figure showing the comparison you made for the four observational and model products.

Ou Wang

On Jul 7, 2018, at 12:01 AM, Yao Yu <yaoyu.9404 at gmail.com<mailto:yaoyu.9404 at gmail.com>> wrote:

Dear EECO suport team,

  I am Yao Yu, a graduate student in China. I am writing to inquire about the assimilation of altimetry SSH in the ECCO V4R3 OGCM.

 I am using satellite altimetry measurements, GRACE measurements and two OGCMs (GLORYS2V4 and ECCO V4R3) to analyze an oceanic gyre in the Argentine Basin. However, ECCO failed to reproduce the sought-after feature (~25-day, ~500 km) while the three others could. I am trying to figure out the reason. I have read about the datasets used in ECCO (ftp://ecco.jpl.nasa.gov/Version4/Release3/doc/v4r3_data.pdf) and then Forgot and Ponte (2015) for details about altimeter data.

I'd be grateful if you can help to answer my questions:

1. Are there any spatial (except for the bin-averaging) and temporal smoothing schema applied to altimeter data?  I don't think the nominal 1-degree spatial resolution of ECCO is coarse, however, ECCO's SSH look quite coarse (comparable with GRACE, ~300km) in the Argentine Basin.

2. If the answer is no for question 1, then are there any possible reasons that can explain inability of ECCO over the Argentine Basin?

Many thanks!
[https://ssl.gstatic.com/ui/v1/icons/mail/images/cleardot.gif]
Yao

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