144105
  • Log in
The Daily Sceptic
No Result
View All Result
  • Articles
  • About
  • Archive
    • ARCHIVE
    • NEWS ROUND-UPS
  • Podcasts
  • Newsletter
  • Premium
  • Donate
  • Log In
The Daily Sceptic
No Result
View All Result

Summer Temperatures in Canada Have Been Massively Exaggerated Since 1978

by Chris Morrison
22 November 2022 10:59 AM

Further holes have been blown in the regularly adjusted global and local surface databases that show increasingly implausible rates of warming. The latest work from Messrs Roy Spencer and John Christy reveals that since 1978 about half of the summer night-time warming across 10 mostly metro areas of Canada was due to increased urbanisation. This urban heat effect accounted for 20% of the day-time warming produced by ‘homogenised’ temperature datasets. The two atmospheric scientists recently published similar results showing 50% less warming over 50 years across the eastern United States.

As the scientists note, the issue around correct temperature measurement is important “since rational energy policy should be based upon reality, not perception”. To the extent that global warming estimates are exaggerated, “so will be energy policy decisions”, they note. Reductions in actual warming mean “climate models become increasingly irrelevant”.

Dr. Roy Spencer and Professor John Christy both work out of the University of Alabama in Huntsville, where they compile the accurate UAH satellite monthly temperature record. This consistently shows less global warming than surface datasets, but is rarely mentioned in the mainstream media. In January, Google AdSense demonitised Spencer’s blog showing the UAH monthly records on the grounds that it contained “unreliable and harmful claims”. Professor Christy is the Alabama state climatologist, and Dr Spencer is partly funded through his office.

Their grounding-breaking work attempts to remove distortions caused by increasing urban heat, and uses human-made structure density data over 50 years supplied by the Landsat satellites. They use a dataset of urbanisation changes called ‘Built-Up’ to determine the average effect that urbanisation has had on surface temperatures. Urbanisation differences are compared to temperature differences from nearby weather stations. More detail on the methodology behind their work can be found here.

For his Canadian work, Spencer uses the Global Hourly Integrated Surface Database which provides mostly hourly readings to support aviation at airports around the world. Airports are a favoured location for surface datasets run by all the major operators, including the U.K.’s Met Office. Night and day-time urban warming results were produced from 70 weather stations scattered across Canada. The table below shows the results from the 10 stations with the “largest diagnosed spurious warming trends” from 1978 to 2022.

It is notable that Calgary, Ottawa, Windsor, Montreal and Edmonton are the five station locations with the greatest rate of increased urbanisation since the 1970s as measured by Landsat, and therefore the highest rate of spurious warming. Over the 10 highest growth locations shown, “48% of the average warming trend is estimated to be due to urbanisation alone”.

The day-time results are shown below:

For the 10 most increasingly urbanised stations, the average reduction in the observed afternoon warming trend is 20%. The scientists note, as do many others, that the urban heat effect on temperatures is larger detectable at night when solar energy absorbed by heat-retaining building material is slowly released.

This work is part of an ongoing investigation by Spencer and Christy into the degree to which surface temperature datasets are producing warming trends that have been exaggerated by increased urbanisation. Preliminary analysis has also been done for the U.K., France, Australia and China. It seems the more work they do, the more critical they become of the surface datasets. Current ‘homogenisation’ techniques for thermometer data adjustments do not explicitly attempt to correct urban trends to match rural ones, they point out. Instead, it appears the reverse occurs. The work of the U.S. meteorologist Anthony Watts is referenced. He found that the U.S. homogenised dataset produced temperature trends “as large as those produced by the stations with the worst siting in terms of spurious heat sources”.

The scientists also refer to a rarely-publicised dataset compiled by the U.S. weather service NOAA from 114 nationwide stations designed to provide recordings away from urban heat distortions. The measurements started in 2005, and to date show little if any warming across the U.S.

Spencer and Christy’s vital work will continue and the Daily Sceptic will carry on reporting their findings. Of course, the mainstream media will ignore the story, presumably on the grounds that these facts don’t fit a pre-determined Net Zero ‘settled’ science narrative – or sick their ‘fact-checkers’ on to us for daring to report it. Meanwhile, the compilers of the corrupted, but politically-correct, temperature figures will continue to declare new global warming records.

Chris Morrison is the Daily Sceptic’s Environment Editor.

Tags: Climate changeDr Roy SpencerGlobal WarmingProfessor John ChristyUniversity of Alabama in HuntsvilleUrban Heat Effect

Donate

We depend on your donations to keep this site going. Please give what you can.

Donate Today

Comment on this Article

You’ll need to set up an account to comment if you don’t already have one. We ask for a minimum donation of £5 if you'd like to make a comment or post in our Forums.

Sign Up
Previous Post

Why is the UN Commissioner For Human Rights Trying to Suppress Free Speech on Twitter?

Next Post

Police Threaten to Arrest Women’s Rights Campaigner if She Doesn’t Attend ‘Voluntary’ Interview After She Was Attacked by Trans Activists

Subscribe
Login
Notify of
new follow-up comments
    Please log in to comment

    To join in with the discussion please make a donation to The Daily Sceptic.

    Profanity and abuse will be removed and may lead to a permanent ban.

    6 Comments
    Oldest
    Newest Most Voted
    Inline Feedbacks
    View all comments

    NEWSLETTER

    View today’s newsletter

    To receive our latest news in the form of a daily email, enter your details here:

    DONATE

    PODCAST

    The End of American Empire? – With Doug Stokes

    by Richard Eldred
    2 May 2025
    5

    LISTED ARTICLES

    • Most Read
    • Most Commented
    • Editors Picks

    News Round-Up

    7 May 2025
    by Richard Eldred

    BREAKING: Merz Government Orders Pushback of All Illegal Migrants at German Borders, Effectively Abolishing Asylum

    7 May 2025
    by Eugyppius

    Orsted Cancels Hornsea 4 Wind Farm – and Kills Miliband’s ‘Clean Power 2030’ Agenda Dead

    7 May 2025
    by David Turver

    Council Net Zero Madness

    7 May 2025
    by Charlotte Gill

    Reform Councillors Refuse Training on Net Zero and Diversity

    6 May 2025
    by Will Jones

    News Round-Up

    39

    Orsted Cancels Hornsea 4 Wind Farm – and Kills Miliband’s ‘Clean Power 2030’ Agenda Dead

    30

    Conservatives Slump to 17% in Poll

    27

    Reform Councillors Refuse Training on Net Zero and Diversity

    35

    BREAKING: Merz Government Orders Pushback of All Illegal Migrants at German Borders, Effectively Abolishing Asylum

    16

    BREAKING: Merz Government Orders Pushback of All Illegal Migrants at German Borders, Effectively Abolishing Asylum

    7 May 2025
    by Eugyppius

    Definitive Guide to the WHO Pandemic Agreement

    7 May 2025
    by Dr David Bell and Dr Thi Thuy Van Dinh

    Orsted Cancels Hornsea 4 Wind Farm – and Kills Miliband’s ‘Clean Power 2030’ Agenda Dead

    7 May 2025
    by David Turver

    Council Net Zero Madness

    7 May 2025
    by Charlotte Gill

    China’s Climate Charade: A Green Façade for Economic Supremacy

    7 May 2025
    by Tilak Doshi

    POSTS BY DATE

    November 2022
    M T W T F S S
     123456
    78910111213
    14151617181920
    21222324252627
    282930  
    « Oct   Dec »

    SOCIAL LINKS

    Free Speech Union
    • Home
    • About us
    • Donate
    • Privacy Policy

    Facebook

    • X

    Instagram

    RSS

    Subscribe to our newsletter

    © Skeptics Ltd.

    Welcome Back!

    Login to your account below

    Forgotten Password? Register

    Create New Account!

    Please note: To be able to comment on our articles you'll need to be a registered donor

    Already have an account?
    Please click here to login Log In

    Retrieve your password

    Please enter your username or email address to reset your password.

    Log In
    wpDiscuz
    No Result
    View All Result
    • Articles
    • About
    • Archive
      • ARCHIVE
      • NEWS ROUND-UPS
    • Podcasts
    • Newsletter
    • Premium
    • Donate
    • Log In

    © Skeptics Ltd.

    You are going to send email to

    Move Comment
    Perfecty
    Do you wish to receive notifications of new articles?
    Notifications preferences