Corrections to the RealClimate Presentation of Modeled Global Ocean Heat Content

NOW Will Tamino Correct his Posts?

Tamino has complained about my model-data presentation of ARGO-era Global Ocean Heat Content in numerous posts. See here and here, and my replies here and here. My replies were also cross posted at WattsUpWithThat here and here. Tamino didn’t like the point where I showed the model projections intersecting with the Ocean Heat Content data. Refer to Figure 1.

Figure 1

A few months ago, Gavin Schmidt of GISS also suggested that my presentations were wrong in his 2011 Updates to model-data comparisons. There he wrote [my boldface]:

As an aside, there are a number of comparisons floating around using only the post 2003 data to compare to the models. These are often baselined in such a way as to exaggerate the model data discrepancy (basically by picking a near-maximum and then drawing the linear trend in the models from that peak). This falls into the common trap of assuming that short term trends are predictive of long-term trends – they just aren’t (There is a nice explanation of the error here).

(That language, by the way, still exists in his updated post even though he has corrected his data.)

Gavin missed the point that I wasn’t interested in presenting long-term trends in that graph. That aside, today, Gavin Schmidt issued a correctionto his presentations of Ocean Heat Content in his model-data comparisons. Gavin writes:

This is just a brief note to point out that a few graphs that I have put together showing Ocean Heat Content changes in recent decades had an incorrect scaling for the GISS model data. My error was in assuming that the model output (which were in units W yr/m2) were scaled for the ocean area only, when in fact they were scaled for the entire global surface area (see fig. 2 in Hansen et al, 2005). Therefore, in converting to units of 1022 Joules for the absolute ocean heat content change, I had used a factor of 1.1 (0.7 x 5.1 x 365 x 3600 x 24 x 10-8), instead of the correct value of 1.61 (5.1 x 365 x 3600 x 24 x 10-8). This problem came to light while we were redoing this analysis for the CMIP5 models and from conversations with dana1981 at skepticalscience.com.

That error was similar one Roger Pielke Sr. had made in one of his Ocean Heat Content posts, an error that Roger corrected almost a year ago.

Gavin went back and corrected the graphs in his earlier model-data comparisons at RealClimate. Thanks for the corrections, Gavin. I’ve been suggesting that your presentations were wrongfor a while now.

So what do the new RealClimate model-data comparison graphs look like for Ocean Heat Content?

From today’s post:

From the update for 2011:

From the update for 2010:

And from the 2009 update:

If we were to look at only the data since 2004, the RealClimate graphs would look very similar to mine shown in Figure 1. In fact, I may have to shift the model projection a little to the left in my graphs.

I wonder if Tamino will continue his nonsensical claims about my ARGO-era presentations and whether he will correct the posts at his blog. If history repeats itself, Tamino won’t.

Thanks to Bill Illis for notifying me of the RealClimate corrections.

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About Bob Tisdale

Research interest: the long-term aftereffects of El Niño and La Nina events on global sea surface temperature and ocean heat content. Author of the ebook Who Turned on the Heat? and regular contributor at WattsUpWithThat.
This entry was posted in Model-Data Comparison OHC, Ocean Heat Content Problems. Bookmark the permalink.

12 Responses to Corrections to the RealClimate Presentation of Modeled Global Ocean Heat Content

  1. rpielke says:

    Hi Bob – I recommend you also present the best-estimate of the global annual-averaged diagnosed radiative imbalance in units of Watts per meter squared for each plot. Perhaps for the period of record for each and since 2003.

    Roger

  2. Pingback: Request To Gavin Schmidt To Update Jim Hansen’s Value Of Upper Ocean Heat Storage | Climate Science: Roger Pielke Sr.

  3. Pingback: Grappling With Reality – A Comment On The Skeptical Science Post By Dana1981 “Modeled and Observed Ocean Heat Content – Is There a Discrepancy?” | Climate Science: Roger Pielke Sr.

  4. Terry Carruthers says:

    Bob,
    Somewhat off topic but was reading Roger Pielke Sr.’s comments about ocean heat content in his latest blog article. Concerning the transfer of heat to the deep ocean and the ability to detect changes in this heat reservoir, have you calculated the size of the deep ocean heat sink and how much heat would need to be transfered to cause a detectable change in its temperature. TIA
    Terry

  5. Bob Tisdale says:

    Terry, sorry, I haven’t looked into it.

    Regards

  6. Pingback: Dana1981 at SkepticalScience Tries to Mislead His Readers | Bob Tisdale – Climate Observations

  7. Pingback: Dana Nuticelli’s Skeptical Science OHC grapple – down for the count | Watts Up With That?

  8. Pingback: Argo, profiled … Tisdale corrects | pindanpost

  9. Pingback: Is Ocean Heat Content Data All It’s Stacked Up to Be? | Bob Tisdale – Climate Observations

  10. Pingback: Is Ocean Heat Content Data All It’s Stacked Up to Be? | Watts Up With That?

  11. Pingback: Tamino Resorts to Childish Attempts at Humor But Offers Nothing of Value | Bob Tisdale – Climate Observations

  12. Pingback: Tamino Resorts to Childish Attempts at Humor But Offers Nothing of Value | Watts Up With That?

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