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New N.H. Temp Reconstructions Devoid Of Mann-Made ‘Hockey Sticks’

by Kenneth Richard
April 27, 2020, 9:43 AM
in News and Opinion
Reading Time: 2 mins read
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tree ringsNew paleoclimate records from Europe, Scandinavia-Russia, China, and the northeastern USA indicate there has been no unusual modern warming.

Instead, these newly published reconstructions show warmer periods and more rapid centennial-scale warming events occurred in past centuries, or when CO2 concentrations were much lower than they are now.

United States

In the late 1990s, Dr. Michael Mann heavily weighted tree-ring evidence from North American bristlecone pines to construct the notorious hockey stick temperature graph featuring a sharp uptick in modern warming.

A new 2,500-year tree-ring reconstruction (411 B.C.E. to 2016 C.E.)  for the northeastern United States shows no unusual climate changes in recent decades have occurred in this region (Pearl et al., 2020).

The authors suggest the tree species used, Atlantic white cedar, is “significantly correlated” with this region’s temperature.

Scandinavia, Russia

Another new dendroclimatology study (Shi et al., 2020) affirms Northern Eurasia (Sweden, Yamal) warmed 3 to 6 times faster during the 4th, 15th, and 19th centuries than during the 1900s-2000s.

For example, the temperature record suggests it warmed 0.37°C to 0.85°C within the last century.

During the Roman and Medieval warm periods as well as the 19th century, regional temperatures rose at much faster rates of 1.37°C to 3.31°C per century.

Further, the record shows regional temperatures were warmer during the first millennium than during the last century.

China

Using ice cores, tree rings, lake sediments, and stalagmites from 28 proxy temperature reconstructions from throughout the “whole country” of China, Hao et al., (2020) find the “longest warm period on the centennial-scale” occurred during the 10th to 13th centuries, or during the Medieval Warm Period (MWP).

The two warmest 30-year periods during the MWP are also “comparable” to the warmth of the most recent decades.

None of these Northern Hemisphere temperature reconstructions indicate there has been any unusual modern warming relative to the natural temperature variations of the last few millennia.

h/t Rúnar O.

Read more at No Tricks Zone

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Comments 2

  1. pater eusebius tenebrarum says:
    5 years ago

    Mann has been thoroughly debunked for almost 20 years now, and yet he continues to make the delusional claim that his “work” has been “vindicated”.

  2. Spurwing Plover says:
    5 years ago

    Looks like Dr Mann has pinched his fingers in his Sliderule way too bad Failed Genius back its back to the old Drawingboard

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