Mann's tree ring proxy train wreck

Eric Worrall writes: Mann’s thermometer spliced hockey stick has taken even more damage in the last few days, with Steve McIntyre helpfully providing reconstructions based on tree rings which demonstrate how, without the benefit of Mike’s scientifically dubious “nature trick”, the hockey stick simply disappears – tree rings demonstrably don’t correlate with temperature. According to…

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Oh Mann! Paper demonstrates that tree-ring proxy temperature data is 'seriously compromised'

Michael Mann won’t be happy about this. A new paper now in open review in the journal Climate of the Past suggests that “modern sample bias “has “seriously compromised” tree-ring temperature reconstructions, producing an “artificial positive signal [e.g. ‘hockey stick’] in the final chronology.” Basically, older trees grow slower, and that mimics the temperature signal…

Tree rings as a proxy for historical ENSO reconstruction

From the University of Hawai’i’s International Pacific Research Center at Mānoa, comes this proxy reconstruction that does some similar things the infamous hockey stick reconstruction, but doesn’t need to pull any statistical “tricks” to make the case. Our old friend the Bristlecone pine in the southwest USA is the test subject again. Like Mann et…

Concord and discord among Northern Hemisphere paleotemperature reconstructions from tree rings

From Science Direct Scott St. George Jan Esper Department of Geography, Environment and Society, University of Minnesota, Minneapolis, USA Department of Geography, Johannes Gutenberg University, Mainz, Germany Received 3 September 2018, Revised 8 November 2018, Accepted 9 November 2018, Available online 15 November 2018. https://doi.org/10.1016/j.quascirev.2018.11.013 Get rights and content Highlights Tree rings are the backbone of…

You can always tell a Mann, but you can’t tell him much – why tree ring data (and climatic conclusions from it) sucks

From the “we only select wood for hockey stick construction” department. Steve McIntyre comes back into the fray with a scathing review of just how crappy the tree ring proxies used by Michael Mann were (and still are), and shows without the questionable stripbark portion of the data, why no “hockey stick” appears. But even…

Hunger Stones and Tree Ring evidence suggests solar cycle influence on climate

The Solar Cycle is responsible for extreme weather and Climate change According to Tree ring and Hunger Stone events by Francis Tucker Manns Ph.D., P.Geo (Ontario) Artesian Geological Research Abstract Recent discovery of the relationship between the location of the North American Jet Stream and extreme weather is a breakthrough in the understanding of solar forced climate change. Five…