The Weekend Wonk: Tamino on Denialist Testimony

January 25, 2014

I’ve posted this past week on Judith Curry’s somewhat flawed testimony before the Senate Environment and Public Works Committee.

The blogger Tamino, who posts at Open Mind blog, is well known for his tenacious and fine grained analysis of arguments from a statistical POV. He has posted twice this week on Curry’s testimony, both of which I repost here – which makes for a long, challenging, but worthwhile read, so get coffee. Both posts have bearing on some of the more active discussions we’ve had on this forum.

Open Mind, Post 1, “True Lies”:

I’ve read the written testimony from Judith Curry before a recent meeting of the Environment and Public Works committee of the U.S. Senate. There’s plenty of stuff that gobsmacked me, but let me tell you what astounded me most on my very first reading.

It’s this:

Global sea level has been rising for the past several thousand years. The key issue is whether the rate of sea level rise is accelerating owing to anthropogenic global warming.

I almost can’t believe that she actually said that.
Let me repeat: I almost can’t believe she actually said that. To a U.S. Senate committee.

There’s considerable evidence that sea level has risen over the last few thousand years. Some of you may be familiar with this graph (from Wikipedia, prepared by Robert Rohde of the “Berkeley team” of which Curry is a member):

It shows sea level estimates throughout the holocene (since 9000 years ago). It seems to me that these data don’t make it certain, but do make it very likely sea level has risen (or at least, not fallen) throughout the holocene. But what’s really important is that it enables us to set some limits on how fast sea level has risen in that time.

Since the year 1900, sea level has risen at an average rate of 1.6 mm/yr according to the global sea level data from Church & White, 1.9 mm/yr using the data from Jevrejeva et al., 1.7 mm/yr according to the Ray & Douglas data. Just for the sake of argument, let’s say between 1.5 and 2 mm/yr over the last century plus.

Has it been going that fast — or even close — for the past several thousand years? Let’s add some lines to the graph, representing what sea level would have been if it had been steady, or had been rising at 0.5 mm/yr, 1 mm/yr, 1.5 mm/yr, or 2 mm/yr:

According to the data, it’s possible — but very unlikely — that sea level rose at an average rate of 0.5 mm/yr throughout the last 6,000 years. But it’s not really possible for the rate to have been as high as 1 mm/yr. As for “between 1.5 and 2 mm/yr,” I believe the correct mathematical nomenclature would be “No way.”

It’s obvious, to anybody who knows what the data say, that the rate over the last century plus has been significantly higher than the rate over the past several thousand years. Obvious.

We could also focus on a more recent time span, the last 2,000 years. I managed to find a reconstruction of sea level at North Carolina covering that time period by Kemp et al. (2011, PNAS, 108(27), 11017-11022, doi:10.1073/pnas.1015619108).

They provide a smoothed time series (shown above), and the data on which it’s based, so of course I took the data and smoothed it myself in order to estimate the rate of sea level rise:

Holy high tide, Batman! A hockey stick!

It wasn’t doing much until about the year 1900, but since then it has taken off like a bat out of hell. In other words, the rate increased — which is what we math geeks call “acceleration.” Mentioning “the past several thousand years” highlights the dramatic nature of the change, unless of course all you say about the past several thousand years is that “Sea level has been rising,” you say nothing abouthow fast compared to how fast it’s rising now, and trust that your audience hasn’t got a clue (which for members of the U.S. Senate is a pretty safe bet).

The fact that “Global sea level has been rising for the past several thousand years” is about as relevant to this issue as the fact that “People died of lung cancer long before there were cigarettes” is to the issue of smoking and health. My opinion: saying that without even mentioning the evidence about the last century’s dramatic increase in the rate is either ignorance on parade, or the kind of mendacity we might refer to as “true lies.”

Open Mind, Post 2, “The Rise and Fall of Judith Curry”:

We’ve been looking closely at the written testimony from Judith Curry before a recent meeting of the Environment and Public Works committee of the U.S. Senate. What we’ve seen so far argues against relying on Curry to give accurate and relevant information.

One of her main evidences that the IPCC AR5 (5th assessment report) is wrong about expressing greater confidence than the AR4, is her discussion of sea level. We’ve already looked at a small part of her discussion, a statement so misleading that I was amazed she would actually say it.

But her main argument regarding sea level rise is this:

It is seen that the rate of rise during 1930-1950 was comparable to, if not larger than, the value in recent years. Hence the data does not seem to support the IPCC’s conclusion of a substantial contribution from anthropogenic forcings to the global mean sea level rise since the 1970s.

She’s referring to (and reproduces) this graph from the IPCC AR5:

It shows trend estimates (i.e., the rate of sea level rise) over time, based on linear regression of 18-year time spans from three global sea level data sets (reconstructions based on tide gauge data), and the trend over the last 18 years based on satellite data (labelled “altimeter”), which at the time of writing only covered 18 years (which is why, I believe, they chose 18 years as their time scale). The times which are plotted are the beginning of each 18-year time span.

I have three complaints about Curry’s argument:

    • 1) Curry fails to mention why IPCC AR5 shows this graph or what they say about it;
    • 2) Even if true, Curry draws the wrong (and unjustified) conclusion;
    • 3) The data show strong evidence of acceleration in the 20th century.Let’s take each in turn.1) Curry fails to mention why IPCC AR5 shows this graph or what they say about it
      Here’s what they say:

      A long time-scale is needed because significant multidecadal variability appears in numerous tide gauge records during the 20th century (Holgate, 2007; Woodworth et al., 2009; Mitchum et al., 2010; Woodworth et al., 2011; Chambers et al., 2012). The multidecadal variability is marked by an increasing trend starting in 1910–1920, a downward trend (i.e., leveling of sea level if a long-term trend is not removed) starting around 1950, and an increasing trend starting around 1980. The pattern can be seen in New York, Mumbai, and Fremantle records, for instance (Figure 3.12), as well as 14 other gauges representing all ocean basins (Chambers et al., 2012), and in all reconstructions (Figure 3.14). It is also seen in an analysis of upper 400 m temperature (Gouretski et al., 2012; Section 3.3.2). Although the calculations of 18-year rates of GMSL rise based on the different reconstruction methods disagree by as much as 2 mm yr–1 before 1950 and on details of the variability (Figure 3.14), all do indicate 18-year trends that were significantly higher than the 20th century average at certain times (1920–1950, 1990–present) and lower at other periods (1910–1920, 1955–1980), likely related to multidecadal variability. Several studies have suggested these variations may be linked to climate fluctuations like the Atlantic Multidecadal Oscillation (AMO) and/or Pacific Decadal Oscillation (PDO, Box 2.5) (Holgate, 2007; Jevrejeva et al., 2008; Chambers et al., 2012), but these results are not conclusive.

      While technically correct that these multidecadal changes represent acceleration/deceleration of sea level, they should not be interpreted as change in the longer-term rate of sea level rise, as a time series longer than the variability is required to detect those trends. Using data extending from 1900 to after 2000, the quadratic term computed from both individual tide gauge records and GMSL reconstructions is significantly positive (Jevrejeva et al., 2008; Church and White, 2011; Rahmstorf and Vermeer, 2011; Woodworth et al., 2011). Church and White (2006) report that the estimated acceleration term in GMSL (twice the quadratic parameter) is 0.009 [0.006 to 0.012] mm yr-2 (1 standard deviation) from 1880 to 2009, which is consistent with the other published estimates (e.g., Jevrejeva et al., 2008; Woodworth et al., 2009) that use records longer than 100 years. Chambers et al. (2012) find that modelling a period near 60 years removes much of the multidecadal variability of the 20th century in the tide gauge reconstruction time series. When a 60-year oscillation is modeled along with an acceleration term, the estimated acceleration in GMSL since 1900 ranges from: 0.000 [–0.002 to 0.002] mm yr–2 in the Ray and Douglas (2011) record, 0.013 [0.007 to 0.019] mm yr–2 in the Jevrejeva et al. (2008) record, and 0.012 [0.009 to 0.015] mm yr–2 in the Church and White (2011) record. Thus, while there is more disagreement on the value of a 20th century acceleration in GMSL when accounting for multi-decadal fluctuations, two out of three records still indicate a significant positive value. The trend in GMSL observed since 1993, however, is not significantly larger than the estimate of 18-year trends in previous decades (e.g., 1920-1950).

      The whole point of this discussion, and of their figure 3.14, is to show that if you want to estimate changes in the rate of sea level rise which are climatically relevant, “A long time-scale is needed“. The IPCC report didn’t ignore or downplay multi-decadal variability (although Curry seems to think that it does about everything, not just sea level rise). It doesn’t pretend that multidecadal variability isn’t natural variation, in fact it gives at least one possible root cause which is “natural.” The IPCC report didn’t ignore either the existence or the possible causes of multidecadal variability, they decided instead to deal with it. I think the one who really needs to “deal with it” is Judith Curry.

      The main point of the IPCC discussion is that those short-term, decadal to multi-decadal, possibly natural variations should not be interpreted as change in the longer-term rate of sea level rise, so don’t use them to draw conclusions about climatically induced acceleration or its absence. I thought their statement was pretty clear. Apparently Judith Curry either didn’t get it, or didn’t want to, because she has done exactly what the IPCC report warns you should not do. My opinion: classic Curry.

      As for the truth or falsehood of the claim that “the rate of rise during 1930-1950 was comparable to, if not larger than, the value in recent years,” let’s take a look at this graph of the rate of sea level rise:

The thick red line shows the estimated rate based on linear regression applied to 10-year time spans. The dashed gray line shows the long-term rate, i.e. the one that’s relevant to climate change. Note that the decadal rate in the 1940s is comparable to, if not higher than, the most recent rate, but for the long-term rate it is not.

In this case, it is most certainly the long-term rate which is correct while all those fluctuations are just plain wrong.

You might be thinking, “Who died and made Tamino the arbiter of what’s “right” and “wrong” in estimates of the rate of sea level rise?” Or maybe “Tamino is just calling the fluctuations “wrong” because he doesn’t like them!”

This is one of those cases in which I can be sure, because the data which produce this figure are artificial data. Therefore the answer is already known — with certainty. The dashed gray line is the right answer, the true sea level rise signal. The thick red line results from the fact that Rahmstorf et al. (2012, Clim. Dyn. 39, 861–875, DOI 10.1007/s00382-011-1226-7) added noise to the artificial signal, noise which in fact emulates that found in the Church & White data set.

Rahmstorf et al. also point out that much of the noise in sea level data isn’t just“ordinary” noise. It’s not entirely (or perhaps even predominantly) due to “natural variability,” it’s in large part due to coverage bias. Since it’s bias and not just stationary noise, that means that even the “error bars” we compute by treating it as noise can exclude the true value. They also point out that satellite altimetry shows less fluctuation than reconstructions based on tide gauge data, arguing that some if not much of the observed decadal and multidecadal variability may be an expression of noise, not a reflection of signal.

It’s also worth mentioning that of the three global data sets, the one which shows the highest rate in the first half of the 20th century is the Jevrejeva et al. data, which uses an unusual method of averaging tide gauge records that ends up giving the northern hemisphere oceans greater statistical weight than the southern hemisphere oceans in spite of the fact that the area of the southern hemisphere oceans is much greater than that of the northern hemisphere oceans. That’s exactly the kind of treatment which can lead to coverage bias, not just extra noise.

There’s another aspect which should be mentioned. Computing trend rates based on sliding 18-year windows is the application of a “moving velocity filter” to the data. That means it really represents the estimated rate at the mid-point in time of the observation window. Like with moving averages, in most cases we insist that the window is complete, so our very first estimate applies to half a window width later than the start of the data while the final estimate applies to half a window width before the end of the data. We lose half a window width at each end of the time series.

Here, for example, are the 18-year trends (moving velocities) of the Church & White data, with times plotted being the midpoints of the individual windows:

Note that it barely goes past the year 2000, but even at that the final value is still the highest — although not by much so the result is consistent with “comparable to”. But, notice also that at the very end the rate has been increasing, so it may well have increased further after 2000. To estimate the rate from the Church & White data all the way up to the year 2010 (when the data end), we need to a better way to estimate the rate than the standard “moving velocity” filter.

I, and others (Jevrejeva et al., Moore et al., Rahmstorf et al.) have argued that a good way to do that is with nonlinear smoothing. Those other authors have used SSA (singular spectrum analysis) to accomplish this, while I’ve tended to use lowess smoothing and pick out the linear coefficient at each moment as the trend estimate for that moment. Let’s see whether or not this is consistent with the results of the moving-velocity filter at the same time scale (nonlinear smoothing result in red):

Yes. Yes, it is.

What does it suggest happened after 2000? This:

Apparently the rate did keep increasing (in this data set), so the final estimated rate turns out to be the largest in the entire time span, and just about the same as the rate indicated by satellite altimetry.

Bottom line: even the claim that “the rate of rise during 1930-1950 was comparable to, if not larger than, the value in recent years” is by no means established as surely as Curry believes. Or, in my opinion, as the surely as the IPCC report states.

2) Even if true, Curry draws the wrong (and unjustified) conclusion

Suppose for the sake of argument that “the rate of rise during 1930-1950 was comparable to, if not larger than, the value in recent years.” Might even be true. How do you get from that to “Hence the data does not seem to support the IPCC’s conclusion of a substantial contribution from anthropogenic forcings to the global mean sea level rise since the 1970s,” especially if you don’t evenmention the rate of rise on climatically relevant time scales? Logic fail.

3) The data show strong evidence of acceleration in the 20th century.

Jevrejeva et al. (2008, GRL, 35, L08715, doi:10.1029/2008GL033611) applied SSA nonlinear smoothing to estimate the time variations of sea level rise ratethroughout their data set, getting this (the black line is global, the blue line for the northeast Atlantic region):

I did the same thing using lowess smoothing, getting this:

Clear result: in addition to multi-decadal variations there is also a consistent increase in the rate of sea level rise throughout the time span. That’s called “acceleration.”

Rahmstorf et al. did a similar analysis on the Church & White 2006 data, the Church & White 2011 data, and the Jevrejeva data (top: Church & White 2006; center: Church & White 2011; bottom: Jevrejeva et al. 2008). The colored lines are what we’re interested in, the estimated rise rates:

In all three cases there is a consistent increase in the rate (a.k.a. “acceleration”) superimposed on multidecadal variation, and in all three cases the estimated rate at the end is the highest of all.

My Opinion

Here’s how I see it: Judith Curry really did nothing more nor less than to scour the IPCC AR5 looking for stuff she could claim weakens the case for dangerous man-made climate change. In so doing, she was willing to ignore what the IPCC report actually says in favor of her preferred interpretation of things. She demonstrated more than once that she doesn’t have sufficient knowledge of what the data have to say, or of what the peer-reviewed literature says, to know what she’s talking about.

It’s rather disappointing, really, because if you’re determined to find fault that’s usually ridiculously easy in any report as lengthy as the IPCC AR5, but she still managed to botch the job. Dismally. She also utterly failed to mention, perhaps even to notice, anything in the IPCC report which strengthens the case. Seriously — are we actually to believe that there isn’t anything like that at all?

I also expect that regarding her testimony, Judith Curry will staunchly refuse tolearn anything from the many critics (I’m far from the only one) who have found serious faults in her testimony.

But, that’s just my opinion.

Below, reposting the “Award Ceremony” wherein Judith Curry receives a special “Climate Scientist of the Year” award from a gaggle of anti-science bloggers and activists.

23 Responses to “The Weekend Wonk: Tamino on Denialist Testimony”

  1. indy222 Says:

    Any informed guesses out there as to why she’s doing this? What’s her motivations, agenda? Financial? “Lone Maverick” complex? These aren’t “informed” on my part, just wild guesses which have demonstrated relevance in considering others on the anti-AGW side.

    • greenman3610 Says:

      I watched her talk at the AGU a couple years ago, sitting next to a seasoned observer of the issue. We both came away scratching our heads and saying “..weird..”.
      Stockholm syndrome came to mind.

      • I do believe a lot of people are suffering from the Stockholm syndrome through their habits and addiction to fossil fuels. Its easy to rationalize totally irrational behavior in order to defend the stuff you need to feel comfortable. Does she or anyone in her family have strong ties to industry or anything gaining heavy profit from fossil fuels? Surely there must be something she is dearly trying to defend with all these well dressed lies even in front of committees like these?

        What bothers me is how little active science these people do besides just trying to pull stuff out of context out of existing research in order to make it look like the original authors have come to the wrong conclusions. If she has a theory, then why don’t she actively pursue and research, collect data for 10 years and write peer reviewed science? Oh yes of course, they wouldn’t go through peer review due to the lack of actual science. And besides, real science is hard work and I highly doubt she would be up to that.

        • What’s “weird” is that she is a real scientist who has co-authored many peer reviewed publications.

        • I have no idea if this is indicative of anything or not, but since you ask about ties to industry, this comment by John Mashey may be of interest.

          • dumboldguy Says:

            Yes, some very “interesting” info there from Mashey and others Can anyone say “conflict of interest”?

            Here’s another tidbit to throw in the hopper. Checking out Curry’s CV on her home page, she apparently disappeared from the face of the Earth between earning her BS in Geography from Northern Illinois University in 1974 and earning her PhD in Geophysical Sciences from the University of Chicago in 1982. Does anyone know what she was doing during that time? Eight years to complete a PhD seems like an awfully long time.

          • I don’t think that 8 years in the US is an awfully long time. As far as I’m aware, 6 years is quite common. Eight might be longer than normal, but only by a couple of years.

          • Mashy’s comments explain a lot. Its not to hard to imagine Curry having a conflict of interest dealing with energy companies(oil) compensation and running a climate and weather biz. I do not find fault with that. However, I think Peter quoted someone about what happens when financial interest collides with thought. I don’t even think its intentional or conscious. Thats precisely why it must be guarded against.

        • Its easy to rationalize totally irrational behavior in order to defend the stuff you need to feel comfortable.

          Try “the stuff you need to stay alive” (as the mercury hovers in the single digits and the gusting winds embed the drifting snow into every window screen in the house).

          It’s hardly irrational behavior, it’s just carried too far.  Mankind is the only animal that cooks, which requires the use of fire.  We’ve been burning stuff for warmth, for defense, and for culinary purposes since before the rise of anatomically modern humans.  This wasn’t that big of a problem as long as it was kept on the scale of the available NPP.  When we started running out of trees and discovered black rocks and then black liquids that burned and made all kinds of other neat stuff, THAT wound up getting out of hand.

          In the present day, we have some billions of people whose lives depend on reliable delivery of energy.  If that energy has to come from burning black minerals or fracced shales, they’ll do it.  But, like catalytic converters removed the smog from the cars, give them an alternative to spewing carbon and they’ll take it.

          They took it in France, and Ontario.  Their electric grids are substantially de-carbonized.  Grams CO2 per kWh is the only thing that matters.  The next steps are to electrify transportation and space heating without adding carbon emissions.  What I’d like to see is folks quit complaining “yer doing it wrong!” and get out of the way of the folks getting it done.

  2. fortranprog Says:

    I found this interesting article from Duke University on Curry and her change in views:

    which has a reference to a curious paper entitled:

    Mixing Politics and Science in Testing
    the Hypothesis That Greenhouse
    Warming Is Causing a Global
    Increase in Hurricane Intensity

    by Prof Curry and husband Peter

    Stockholm Syndrome seems a good explanation….

  3. What is it with sea level and acceleration? Curry’s comments on sea level are troubling. This is dishonesty. We know sea level didn’t change for greater than two millennia and she knows it, too. She has the same graph on her website. There are multiple levels of deception. First, SLR has not changed for more than 2 millennia. Todays SLR rates stand out for that period of time. Secondly, when SLR did change more than 3000 years ago, we were transitioning from an ice age. Does Curry mean to imply that the current rates of SLR are comparable to the last ice age? If so, she leaves the opposite in her testimony where she opines its no big deal. I think I find the last ice age a big deal, no thanks. Its odd that she accuses IPCC of malfeasance. What are we to take of her comments given her own behavior?

  4. Cy Halothrin Says:

    I’m personally friends with two denialists, both of whom are pretty intelligent people. I’ve tried to figure out how they can be so delusional.

    One of them (male, about age 45) found Jesus, and that seems to be where his willful ignorance comes from. No one but God controls the temperature on Earth. This guy is very good at math and science, and is a whiz with electronics. But he doesn’t believe in evolution.

    The other friend (male, age 35) is an atheist, and actually has a degree in meteorology though he’s never worked in that field. I find him to be very emotionally immature (he likes stupid pranks and practical jokes that no one else thinks is funny). He has a jeep and drives like a maniac (another sign of immaturity), and puts on about 500 miles a week in purely recreational driving. I’ve made up my mind that he’s an AGW denier because admitting that global warming is real makes him feel guilty about his excessive gasoline consumption. Also, he’s from the UK and votes for the Conservatives, and they don’t believe in global warming so he can’t either because he’s a loyal member of their tribe.

    So as for Judith Curry, who knows? Is she being paid off? Did she find Jesus? Does she own a motor home or SUV and can’t handle the guilt of her consumptive lifestyle? Does she vote Republican because she’s anti-abortion? (If you’re of the Republican tribe, you’re not allowed to believe in AGW). I can’t say what’s in Judith’s head, but I hope that someday she wakes up and realizes the damage she’s doing.

    • fortranprog Says:

      From the U.K you say – say no more, that explains it, although the leader of the conservative party has teamed up with his trendy mate Bono to tackle poverty and global warming it seems:

      DAVOS, Switzerland (AP) — British Prime Minister David Cameron says efforts to eradicate poverty must go hand-in-hand with curbing global warming.

      The comments came Friday at an Associated Press debate looking ahead to the expiration of the United Nations’ “millennium goals” to reduce poverty, hunger and child mortality and combat disease by 2015, and asking what goals should be set for the next 15 years.

      Panelists, who included rock star Bono, agreed that combating climate change must be central to those goals.

      The discussion at the World Economic Forum in Davos, Switzerland, also included officials from Nigeria, Save the Children International and Prudential. It was moderated by AP Senior Managing Editor Michael Oreskes.

      Plus Joe Romm on Curry

      • Perfect Curry debunk. Especially love the Georgian proverb. ” When three people say you are drunk. Go to sleep”. Good night, Curry.

      • anotheralionel Says:

        fortranprog (interesting handle)

        that link to an article by Joe Romm chimes with a thought I had. I am in the UK but take an interest in the US political scene for obvious reasons thus I watched the hours of testimony back in 2010 including the early introduction by Ralph Hall – painful – from the delegates and downloaded their written testimonies.

        I was struck by how far from written testimony were those spoken by Curry and also Lindzen. IMHO Curry was on that panel as an understudy to Lindzen. Now Lindzen has ‘retired’ his apprentice comes more to the fore.

        That does not rule out some of those other drivers of Curry behaviour mentioned by others above. Actions are often the result of a complex of motives.

        Whatever, Curry has moved from mildly spicy Korma bland denial to full on hot and spicy no mistake fiery Vindaloo denial.

    • dumboldguy Says:

      I don’t want to upset any female Crock followers, but has anyone considered it was a hormonal thing with Curry? Before I go any farther, let me say that testosterone is by far the most dangerous hormone we humans face—-it’s the male of the human species that is responsible for 99% of the madness and mayhem we have seen in our history.

      Menopause and PMS can be devastating for some women, and Curry is approaching 60, so she may have been influenced by hormonal imbalances over the past decade.

      There was a case in VA a number of years ago in which a female orthopedic surgeon was acquitted of charges that she assaulted a VA State Trooper who stopped her for a traffic violation. She did NOT deny attacking him, but maintained that she suffered from extreme PMS and that’s what made her do it. This became known as “The PMS Defense”, and was apparently accepted as a form of “temporary insanity”, since she walked. This same orthopedic surgeon treated me for a broken bone in my hand that I suffered one Christmas Eve while chopping wood (don’t ask). She was highly efficient and competent.

  5. adelady Says:

    Anyone who needs something more visual or concrete to show others definitively that the “sea level’s been rising for hundreds (or thousands) of years” argument is a shattered crock can use Jerry Mitrovica’s half hour lecture.

    Or just the first 10 minutes or so talking about Roman fish tanks. Solid, incontrovertible memorable evidence that the idea is hopelessly lost. If those others are in the denialist camp then they’ll also get a bit of reward/ reinforcement from Jerry’s closing comments about the value of denier arguments driving some scientists to look for further evidence.

  6. fortranprog Says:

    I hate to admit it but here we have an enlightened conservative – RIP Maggie

  7. […] 2014/01/25: PSinclair: The Weekend Wonk: Tamino on Denialist Testimony […]

  8. […] Since the year 1900, sea level has risen at an average rate of 1.6 mm/yr according to the global sea level data from Church & White, 1.9 mm/yr using the data from Jevrejeva et al., 1.7 mm/yr according to the Ray & Douglas …  […]

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