Error bars? What error bars are you talking about? I hate to break it to you long but the standard deviation is not an error bar. Please, go look up standard deviation before you make a fool of yourself any more than you have already.
https://en.wikipedia.org/wiki/Error_bar
Error bars often represent one standard deviation of uncertainty,
one standard error, or a particular confidence interval (e.g., a 95% interval).
But a bulge created by an El Nino would affect all of them and not just one.
We really have no way of knowing since we do not know the cause of the bulge from
an El Nino..What we have is the data itself, that showed a greater influence at low tide.
And the link I provided says there is one. You don't read anything I link to do you?
Your link,
https://earthdata.nasa.gov/communit...rojects/climate-data-record-of-altimetric-slc
mentioned little about the technical aspects of the satellite altimeter, about the best it had was the statement,
However, corrections to such observations undergo frequent improvements, and our team is at the forefront of those efforts. These include using of precision orbit determination (POD) and terrestrial reference frames, radiometer calibrations for the wet path delay correction, the dry path delay correction, sea state bias, tides (which also affect the POD and are not a correction but a well understood signal that is removed), instrument corrections, etc.
And they mention that they do remove the tide signal as I said.
The question becomes which tide signal do they remove, since there is considerable error in tidal predictions vs measurements?
It is difficult for me to compress 30 plus years of looking at wave theories into a simple analogy, but I think I have one.
imagine an entertainment venue like a Dave and Busters, that caters to both Adults and Children.
On different days of the week they have an Adult only day, a teen day, or a kids under 12 day,
but the same schedule each 7 day week.
Now if on every 10th day, they took an average height of a customer, there would be significant
errors in their measurements because some 10th days would be adults, some teens, and some children.
It could take 7, 10 day cycles to get to where they took the sample on the same week day.
Tides are much more complex, with 12 hour cycle superimposed on a 6 month cycle.
A 10 day satellite sample may not see the the same tide phase at the same location more than once in it's
entire life cycle.
Then we add on the error, that for any given physical location, the Astronomical tide could be off by several feet,
due to local weather conditions.