42,000 years in the past the earth’s magnetic subject collapsed and the world cooled down – watts with that?

Guest essay by Eric Worrall

UNSW’s “Ship of Fools” captain Chris Turney claims to have identified a climate catastrophe 42,000 years ago caused by solar periods, intense bombardment with cosmic rays, and the collapse of the Earth’s magnetic field.

The Earth’s magnetic field collapsed 42,000 years ago, causing massive, sudden climate change

February 19, 2021, 7:20 a.m. AEDT

Chris Fogwill
Professor of Glaciology and Paleoclimatology, Head of School Geography, Geology and Environment and Director of the Institute for Sustainable Future at Keele University

Alan Hogg
Professor, Director, Carbon Dating Laboratory, University of Waikato

Chris Turney
Professor of Earth Sciences and Climate Change, Director of the Earth and Sustainability Science Research Center, Director of the Chronos 14Carbon-Cycle Facility and UNSW Director of the ARC Center for Excellence in Australian Biodiversity and Heritage, UNSW

Zoë Thomas Zoë Thomas is a friend of the conversation.
ARC DECRA Fellow, UNSW

The world experienced several centuries of apocalyptic conditions 42,000 years ago, triggered by a reversal of the Earth’s magnetic poles combined with changes in the behavior of the sun. That is the main finding of our new multidisciplinary study published in Science.

This last great geomagnetic reversal sparked a series of dramatic events with far-reaching consequences for our planet. They read like the plot of a horror film: the ozone layer has been destroyed, electric storms raged over the tropicsSolar winds created spectacular light shows (aurors), Arctic air rushed over North America, ice sheets and glaciers grew, and weather patterns changed dramatically.

During these events, life on Earth was exposed to intense ultraviolet light, Neanderthals and giant animals known as megafauna became extinct, while modern humans took refuge in caves.

…

Due to the coincidence of seemingly random cosmic events and the extreme environmental changes around the world 42,000 years ago We called this time the “Adams Event” – a tribute to the great science fiction writer Douglas Adamswho wrote The Hitchhiker’s Guide to the Galaxy and identified “42” as the answer to life, the universe and everything. Douglas Adams was really up to something big, and the remaining mystery is how did he know?

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Read more: https://theconversation.com/earths-magnetic-field-broke-down-42-000-years-ago-and-caused-massive-sudden-climate-change-155580

The abstract of the study;

A global environmental crisis 42,000 years ago

Alan Cooper, Chris SM Turney, Jonathan Palmer, Alan Hogg, Matt McGlone, Janet Wilmshurst, Andrew M. Lorrey, Timotheus J. Heaton, James M. Russell, Ken McCracken, Julien G. Anet, Eugene Rozanov, Marina Friedel, Ivo Suter Thomas Peter, Raimund Muscheler, Florian Adolphi, Anthony Dosseto, J. Tyler Faith, Pavla Fenwick, Christopher J. Fogwill, Konrad Hughen, Mathew Lipson, Jiabo Liu, Norbert Nowaczyk, Eleanor Rainsley, Christopher Bronk Ramsey, Paolo Sebastianelli, Yassine Souilmi, Janelle Stevenson, Zoë Thomas, Raymond Tobler, Roland Zech

Geological archives record multiple reversals of the Earth’s magnetic poles, but the global impact of these events, if any, remains unclear. The unsafe radiocarbon calibration has done little research into the possible effects of the last great magnetic inversion known as the Laschamps excursion [41 to 42 thousand years ago (ka)]. We use ancient New Zealand kauri trees (Agathis australis) to make a detailed record of atmospheric radiocarbon levels during the Laschamps excursion. We accurately characterize the geomagnetic reversal and perform global modeling of the chemical climate and detailed radiocarbon dating of paleoenvironmental records to study the effects. We find that geomagnetic field minima ~ 42 ka combined with Grand Solar Minima caused significant changes in atmospheric ozone concentration and circulation, and caused synchronous global climate changes that resulted in large environmental changes, extinction events and transformations in the archaeological record.

Read more: https://science.sciencemag.org/content/371/6531/811

Unfortunately, there is a fee for the full study, but I think we got the idea.

I have Dr. Willie Soon asked about this article. He is very doubtful of the suggestion that cosmic rays significantly affect global climate, the date for the Laschamp events (41,000 years geomagnetic anomaly), the dating of the kauri trees, and claims that the collapse of the Earth’s magnetic field will lead to the destruction of the Ozone layer.

Chris Turney’s other endeavors include his ill-advised ship of fools expedition stuck in global warming Antarctica and some fascinating theories about dying penguins.

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