New Study: 25-45% Of Warming Since 1950s Is Due To Urbanization, Not CO2Climate Change Dispatch / 6d
Why have sea surface temperatures and proxy temperature reconstructions so strongly diverged from the instrumental land record in recent decades?
Because “0.36 ± 0.04 °C” of non-climatic warming is from roofs, asphalt, machines, vehicles…artificially enhance the post-1950’s global temperature trend.
A new analysis (Scafetta, 2021) suggests:
• Urban Heat Island (UHI) effects can raise city temperatures 6-9°C above the temperatures in surrounding rural areas. These significant biases are not sufficiently removed from instrumental records.
• Sea surface temperatures and land temperatures showed matching variations and amplitudes from 1900 to 1980. After 1980, land surface temperatures rose substantially more, suggesting nearly half of the land temperature increase is non-climatic.
• Tree-ring temperature reconstructions showed a strikingly similar pattern of amplitude and oscillation prior to the 1980s. After the 1980s, the instrumental record claims more than twice as much warming as the proxy records.
• Between 25-45% of the warming from 1940-1960 to 2000-2020 appears to be artificial, or non-climatic.
• Climate models overestimate the 1940-1960 to 2000-2020 climatic warming by about 40% in hindcasts.
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