Why did Lonny Eachus link to a graph showing a 3.1 mm/year global sea level trend? Since that's higher than Lonny's claimed "1.1 mm/year", doesn't that simple comparison show the rate of sea level rise is increasing (i.e. accelerating) over the long term? And since Lonny's accused scientists of being "liars" if they acknowledge the global sea level rise of ~3 mm/year, why did Lonny cite a graph containing what he called a lie from a scientist he's previously called a "liar"?
Furthermore, that's not a peer-reviewed paper. It's a slide from a 2011 presentation which hasn't been turned into a peer-reviewed paper. A real skeptic might wonder why it hasn't. Hint: in 2011 Jane/Lonny briefly stopped denying satellite measurements of sea level because they showed a short term drop. Of course, scientists told Jane that this was because the 2011 La Nina caused such massive flooding that global sea level fell temporarily. See Boening et al. 2012 (PDF).
So is it really surprising that calculating sea level acceleration from 1993-2011 gave an unrepresentative answer? Especially because that's a short timespan, and detecting acceleration requires a longer timespan than just detecting a trend. Maybe we could learn why that 2011 presentation hasn't become a peer-reviewed paper by looking at that same data up to 2016.
Let's analyze that raw data (backup) from sealevel.colorado.edu (backup). Here are accelerations and uncertainties for timespans that all end at 2016.1 but start at 1993, 1994, etc. Notice the similarities between the satellite acceleration graph and the older global tide gauge acceleration graph I've shown Jane/Lonny. All the black best-fit accelerations are positive. More recent accelerations tend to be larger. (The most recent accelerations and even their red lower 95% confidence intervals are off the scale even though the upper vertical limit is twice as high as in the older graph.) This tends to suggest that not only is global sea level accelerating, it's even "jerking" up.
(Technical note: those 95% confidence intervals were calculated using a ARMA(1,1) noise model. I also tested AR(1), MA(1), ARMA(1,2), and ARMA(2,1), but ARMA(1,1) minimized both the AIC and BIC.)
That's not a peer-reviewed paper, Lonny. It's yet another of your crackpot blog links. This time in German, so we're at the mercy of automated translation. Are you joking?
Nonsense. Despite WUWT's and Lonny's distortions, Winnick and Caves 2015 doesn't even indirectly "show SLR slightly DEcelerated." Instead, Winnick and Caves 2015 directly shows that ~3 million years ago when atmospheric CO2 was roughly equivalent to today's concentration, global mean sea level was 9 - 13.5 meters higher than it is now.
Aside from other problems with that WUWT rant, it's hilarious that Lonny pretends that mainstream scientists are somehow only using "ONE beach" to study acceleration. Because that's exactly what Lonny's WUWT rant does! Lonny's WUWT rant doesn't analyze a global sea level timeseries for acceleration, instead it cherry-picks "ONE beach" at a time.
Hughes and Williams 2010 (PDF) confirms that local sealevel trends have lower signal-to-noise ratios (SNRs) than global sealevel trends. This means that global trends (and accelerations) can be precisely estimated using less data than required for local trends and accelerations. They explain why: "...the global average is reducing variability by more than just statistical averaging of noise, it is genuinely reflecting the fact that much of the variability is due to redistribution of volume."
So the global ocean is sloshing around, which means that any scientist who's actually interested in sealevel rise wouldn't just cherry-pick ONE beach at a time. They'd take a global average. Why does WUWT refuse to do that?
Again, same story. Why do Lonny's WUWT links keep cherry-picking individual beaches? Is it because WUWTians know that a global average would have such a high signal-to-noise ratio (SNR) that they'd have to acknowledge accelerating sealevel?
Again, same story. That WUWT rant refuses to analyze a global sealevel timeseries, instead cherry-picking "ONE beach" at a time. Sadly, that sort of nonsense really IS exactly what Lonny Eachus has been saying. Ironically, even the first comment on that WUWT rant points out this blatant problem.
All alarmists cite Church & White, for example... never any papers with different results. [Lonny Eachus, 2015-11-05]
And yet strangely, Lonny hasn't linked a paper which provides a different global sea level timeseries. Even Houston and Dean 2011 (which Jane/Lonny cited) doesn't provide a global sea level timeseries. Instead, Houston and Dean 2011 mangled and cherry-picked the timeseries from Church and White 2006. If Lonny ever finds another paper which provides a global sea level timeseries, I'd gladly help Lonny analyze that timeseries for acceleration.
The reports of sea level rise accelerating have been refuted by more recent studies. [Lonny Eachus, 2015-12-07]
"Sea level is rising at an increasing rate
"Proxy and instrumental sea level data indicate a transition in the late 19th to the early 20th century from relatively low mean rates of rise over the previous two millennia to higher rates of rise (high confidence). It is likely that the rate of global mean sea level rise has continued to increase since the early 20th century."
That's also consistent with the US NAS's statement that "Sea level is rising faster in recent decades". But instead of acknowledging all that, Lonny links to WUWT:
Presumably Lonny means "PSMSL" data, which was already used to create a global sea level time series: "We use monthly sea-level data downloaded from the Permanent Service for Mean Sea Level (PSMSL; Woodworth and Player 2003) web site (http://www.psmsl.org) in August 2010."
Notice that Church and White did what WUWT refuses to do: calculate a global sea level time series from PSMSL data, rather than cherry-picking measurements from one beach at a time.
Sea levels have been rising for a long time. No acceleration according to recent papers. [Lonny Eachus, 2016-01-06]
I'm not denying that it's rising. But the latest studies I've seen say it's steady or DEcelerating. [Lonny Eachus, 2016-01-16]
Recent papers: SLR has not accelerated. Same rate for 100s of years. [Lonny Eachus, 2016-02-10]
Recent peer-reviewed paper says sea level rise NOT accelerating. Same rate for hundreds of years. Maybe even slowing. [Lonny Eachus, 2016-02-23]
Nonsense. Once again, Lonny just keeps insisting these papers exist without links. Ironically, the only paper Lonny's linked which studies acceleration is Kopp et al. 2016: "... A significant GSL [global sea-level] acceleration began in the 19th century and yielded a 20th century rise that is extremely likely (probability P >= 0.95) faster than during any of the previous 27 centuries. A semiempirical model calibrated against the GSL reconstruction indicates that, in the absence of anthropogenic climate change, it is extremely likely (P=0.95) that 20th century GSL would have risen by less than 51% of the observed 13.8 +/- 1.5 cm.
That's right, Lonny. You've never been able to link to papers showing "deceleration" but you did link to a paper showing acceleration!
Several recent papers show DEceleration of sea level rise, compared to past centuries. [Lonny Eachus]
You keep saying that, but you've never been able to link to papers showing "deceleration". [Dumb Scientist]
(A) I have several times. Too bad you missed them.
(B) You're blocked. Stop tweeting at me. [Lonny Eachus, 2016-04-17]
Wrong again, Lonny. Several times, you have linked incoherent WUWT rants, papers which don't show deceleration, an out-of-date presentation, and a paper which actually shows accelerating sealevel! And you just told a mother who blocked you that there's a "special place in Hell" for people like her. Aren't you the person who said this?
I will rebut anybody if I have REASON and EVIDENCE to believe they are wrong. And not apologize. [Lonny Eachus, 2016-03-14]
I make evidence-based comments about climate science. No amount of harassment or attempted coercion from you will stop me. [Lonny Eachus, 2016-03-15]
I will not stop making evidence-based comments about climate science. [Lonny Eachus, 2016-03-15]
Does Jane/Lonny Eachus really not recognize his hypocrisy? Apparently not.