On 21/02/2018 09:15, Martin Brown wrote:
On 20/02/2018 12:43, N_Cook wrote:
My Jason1 + Jason2 + Jason3 concattenated graphical plot
http://diverse.4mg.com/jason1+2+3r.jpg
2003 to Nov 2017
retaining as much as possible of the 3 separate images, 2mm
discontinuities, linear "fit" segments etc.

Other such long-term plots

http://www.kpress.info/images/Jan_20...level_rise.jpg

https://www.aviso.altimetry.fr/filea... rence_sm.png

Anyone doubt a curve is a better fit than linear, then just a matter
of what sort of curve is the optimal fit.

A curve might well be a (slightly) better fit, but I am not convinced
the data are strong enough to merit fitting an extra free parameter.

http://diverse.4mg.com/jason1+2+3r.jpg

I am curious as to why Jason1 data is smooth but Jason2 has a distinct
sinusoidal variation with a 3 year period. There is some weak evidence
for a change in slope but it is just within the noise. More recent data
seeming to have quite a lot more of it than earlier in the decade.


Part of the picture, beyond annual seasonality, may be
http://polarportal.dk/en/greenland/m...height-change/
and a conversion factor of 458 GigaTons Greenland ice loss equates to
1.45mm of global sea level rise

The other is ENSO which may be on
https://www.esrl.noaa.gov/psd/enso
but I cannot view it on this pc, and I've no idea how old the data is,
but basically invert and delay a few months, superimposed on the
altimetry plots.