Study suggests three periods of global warming slowdown since 1891 due to natural causes

Posted: June 8, 2018 by oldbrew in Natural Variation, research, solar system dynamics
Tags: ,


If ‘slowdowns’ in global average temperatures can be natural, why not ‘speed-ups’ as well? Recent global temperature patterns correlate very poorly, if at all, with changes in the trace gas CO2 as required by IPCC-supporting climate theorists.

A team of researchers from the U.K., Sweden and Australia has found that three periods of global warming slowdown since 1891 were likely due to natural causes rather than disruptions to the factors causing global warming, reports Phys.org.

In their paper published on the open access site Science Advances, the group describes their study of global mean surface temperatures (GST) since the late 19th century and what they found.

In this new effort, the researchers looked at GST as registered by multiple sources around the globe over the past 127 years, noting the slow march of temperature increases. More specifically, they noted the three previously identified slowdowns in GST increases—the time periods from 1896 to 1910, from 1941 to 1975, and then from 1998 to 2013. They then looked at factors that could have contributed to these slowdowns and found natural causes for each.

The team first reports that their study showed results similar to others regarding GST increases—they have been slowly increasing overall for more than a century. They then offer possible explanations for the three main observed slowdowns in GST increase.

For the first slowdown, they found evidence of El Niño and La Niña weather patterns that likely reduced heating by producing more cloud cover.

For the second slowdown, they found evidence of increased volcanism—smoke and ashes from volcanoes can block sunlight.

The team asserts that the third slowdown, which is also the one on which many global warming skeptics rely, was likely caused by a combination of La Niña events and volcanism. They further note that the third slowdown was not a stopping point—temperatures continued to rise, they just did so at a slower pace.

The researchers also looked at data from studies of the sun and found that there was a slowdown in energy output from 2001 to 2010, which was also a likely contributor to the third slowdown.

Source: Study suggests three periods of global warming slowdown since 1891 due to natural temporary causes | Phys.org

Comments
  1. craigm350 says:

    Reblogged this on WeatherAction News and commented:
    From the article;

    The researchers also looked at data from studies of the sun and found that there was a slowdown in energy output from 2001 to 2010, which was also a likely contributor to the third slowdown

    But, but, but….

  2. oldbrew says:

    We have highlighted two warming periods, 1911–1940 and 1976–1997, and three slowdown periods, 1896–1910, 1941–1975, and 1998–2013.

    So about 50-50 alternate warming/cooling (‘slowdown’) since 1911, which has little or nothing in common with the steady upward gradient of CO2 during that time.

    In all slowdowns, GA warming is fully or partly offset by natural cooling.

    Back to claiming cooling is natural but warming isn’t. Such claims are unnatural :/

  3. stpaulchuck says:

    ” the one on which many global warming skeptics rely”
    the infamous skeptics moniker once again. No one denies global warming. Or cooling. It’s a total strawman argument of course.

    Then of course there’s the also infamous cherry picking of time period – roughly the last 130 years. Hmmm, seems to me we came out of the LIA around a few years before that. So, not freezing cold is… wait for it… WARMER. And to get there we have to… once again, wait for it…. WARM UP.

    There is just so much empirical evidence proving a fundamentally natural drive of our overall temperature that these Lysenko-ists will eventually go down in scientific infamy (where they belong). Between papers by Scafetta, Zeller and Nikolov, the current papers on atmospheric pressure and lapse rates, and all the many papers on the solar variability the warmist scam is certain to be fully repudiated with finger pointing and acrimony all around.

  4. Bitter@twisted says:

    Unfortunately we haven’t reached peak stupidity yet.
    Climate “science” has still some way to go.

  5. oldbrew says:

    Flashback: 10 July 2007
    ‘No Sun link’ to climate change
    By Richard Black
    BBC Environment Correspondent

    A new scientific study concludes that changes in the Sun’s output cannot be causing modern-day climate change.
    http://news.bbc.co.uk/1/hi/sci/tech/6290228.stm
    – – –
    Busted…

    NEW STUDY: THE SUN AND VOLCANOES CAUSED THE PAUSE
    Date: 12/06/18 Dr David Whitehouse, GWPF Science Editor

    Last week a team of researchers from the UK Met Office, the University of East Anglia, the University of Gothenburg, the University of Southern Queensland and the Sorbonne published in the journal Science Advances an interesting paper showing that the recent much debated and researched 21st century “slowdown” in global surface temperatures was real and could be explained by reduced solar activity and increased volcanic counteracting climate forcing from greenhouse gases.

    http://www.thegwpf.com/the-sun-and-volcanoes-cause-the-pause/

  6. Salvatore Del Prete says:

    What are they gong to say when the temperatures fail to rise starting this year and moving forward?

  7. p.g.sharrow says:

    The data is wrong and needs further adjustment..pg

  8. oldbrew says:

    When climate data doesn’t agree with IPCC theory, blame the data.

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