Version 6.0 of the UAH dataset released

Posted: April 28, 2015 by Andrew in solar system dynamics

Dr Roy Spencer has announced the release of the latest version of the UAH temperature data set.

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“By far the most extensive revision of the procedures and computer code we have ever produced in over 25 years…”

The significant change being:

Decrease in the global – average Lower Tropospheric (LT) trend from +0.140 C/decade (Dec. ’78 through Mar. ’15) to +0.114 C/decade.

Read the full statement Here.

In PDF format

Comments
  1. A C Osborn says:

    More in line with RSS than ever.
    A Slightly lower overall trend and lower recent values.
    2014 is now even further from the warmest year ever according to the Satellites.

  2. Ned Nikolov says:

    The UAH data set v. 6.0 looks now very similar to the RSS Inc. satellite-based LT temperature record. Hence, the question emerges: Why surface-measured global temperature trends reported by HadCRU4, NCDC, and NASA deviate so significantly from satellite-derived trends? What is the role of the numerous adjustments made in surface (thermometer) observations to increase the ‘official’ warming trends?

  3. E.M.Smith says:

    @Ned: It is called Tasty Fudge and it is in the surface record to generate more grant revenue.

    Think of it as just another artificial sweetener….

  4. Anything is possible says:

    @ Ned Nikolov / E.M.Smith :

    The divergence between surface and atmospheric temperatures may be less to do with the surface temperature data being wrong, and more to do with the fact that much of the human-driven surface warming (mainly UHI) is confined entirely to the surface.

    This post gives a good explanation how that works :

    https://pielkeclimatesci.wordpress.com/2012/07/12/guest-post-by-richard-mcnider-on-the-new-jgr-atmosphere-article-response-and-sensitivity-of-the-nocturnal-boundary-layer-over-land-to-added-longwave-radiative-forcing-2012/

  5. tchannon says:

    Data format is different. On eyeballing there was an immediate question mark, something which doesn’t seem to be mentioned.

    In the PDF look at fig 4 or fig 9 which imply that what I see in the data is right. UAH no longer gives polar data. RSS never has.

    My opinion given in the past is that UAH attenuates finer detail, RSS does less so but shows artefacts. They are different.

  6. Jaime says:

    Alarmists will say:

    “UAH merely adjusted its temperatures to keep in line with the lesser warming/cooling trend shown by RSS, especially over the past 18 years. UAH was an embrarrassment because it confirmed the warming trend shown by the surface datasets, therefore UAH ‘fixed’ it! RSS was the datset that needed adjusting, not UAH.”

    That’s what they’ll say.

  7. Andrew says:

    tchannon.

    According to a comment at the blog measurements are taken from 85N to 85S (degrees)

  8. Kristian says:

    tchannon/Andrew,

    UAH measure from 82.5N – 82.5S. They always have. Nothing new. RSS measure from 82.5N to 70S.

  9. Kristian says:

    Jaime says, April 28, 2015 at 9:01 pm:

    “Alarmists will say:

    “UAH merely adjusted its temperatures to keep in line with the lesser warming/cooling trend shown by RSS, especially over the past 18 years. UAH was an embrarrassment because it confirmed the warming trend shown by the surface datasets, therefore UAH ‘fixed’ it! RSS was the datset that needed adjusting, not UAH.”

    That’s what they’ll say.”

    I’m sure it will be. However, this is exactly what happened to HadCRUt3, only the other way around. It became an embarrassment to the Climate Establishment, since it showed global surface temps flatlining or even cooling slightly since 1997/98. So HadCRU ‘fixed it’ with the introduction of their new (and ‘improved’) version 4, adjusted to match almost to perfection the GISTEMP series.

  10. tchannon says:

    Kristan, I take a variety of datasets into a common format and then output as required. This includes writing the decode.

    These are the old datasets, Moll. projection so that latitudes are straight lines, equal area plots.

    A bug I never fixed was lamaz projection fails to render the southern hemisphere if it is biased too far that way, feature of gnuplot. Needs rewriting either working around or using a different plot library. Otherwise I would show the pole holes.

  11. tchannon says:

    Oh my.

    vs.

    All I have done is literally plot the 5 degree square data patches.

  12. tchannon says:

    Okay, old work, maybe not right for the purpose here. I’ve remapped to make missing data obvious and put a narrow transition around zero with cyan one side and pink the other, the plot software blends these.

    Click for full size.

  13. gallopingcamel says:

    Ned,
    I like Lindzen’s observation to the UK parliament:
    “We may not be able to predict the future, but in climate ‘science,’ we also can’t predict the past.”

    How can anyone take GHCN seriously when they adjust their own past data without explanation.

  14. thefordprefect says:

    Anyone know where to get the code. Version 5.x was a larf!

  15. tchannon says:

    Yay, UAH TLT V6.0 beta. As I said, not to the poles but close.

    Proof of import concept, now I have to figure how to get this to fit the scheme, rather minor change, about parsing, import to database. Whole thing needs a rewrite anyway. Hindsight, not knowing what was needed.

    The coastlines are crude, could do much better today.