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Ancient Tree Shows Result of Magnetic Pole Switch
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Do terrestrial geomagnetic field reversals have an effect on Earth s climate? Cooper et al.created a precisely dated radiocarbon record around the time of the Laschamps geomagnetic reversal about 41,000 years ago from the rings of New Zealand swamp kauri trees. This record reveals a substantial increase in the carbon-14 content of the atmosphere culminating during the period of weakening magnetic field strength preceding the polarity switch. The authors modeled the consequences of this event and concluded that the geomagnetic field minimum caused substantial changes in atmospheric ozone concentration that drove synchronous global climate and environmental shifts.
Geological archives record multiple reversals of Earth’s magnetic poles, but the global impacts of these events, if any, remain unclear. Uncertain radiocarbon calibration has limited investigation of the potential effects of the last major magnetic inversion, known as the Laschamps Excursion
U.S. Congress 2019-2020: Bills Introduced (Over 5,000 in the House and over 3,000 in the Senate)
Fish Factor:Alaskans Prepare for Poor to Average Salmon Runs By LAINE WELCH - Alaskans are preparing for another salmon season of poor to average runs to most regions.
The big exception once again is at Bristol Bay where another massive return of more than 51 million sockeyes is expected. Managers predict that surge will produce a harvest of over 36 million reds to fishermen.
Bristol Bay is home to the largest wild sockeye salmon run in the world and typically accounts for 42% of the world’s sockeye harvest. Those fish and all wild salmon compete in a tough worldwide commodities market, where Alaska salmon claims 13% of the global supply.
Alanna Mitchell
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About 42,000 years ago, Earth was beset with oddness. Its magnetic field collapsed. Ice sheets surged across North America, Australasia and the Andes. Wind belts shifted across the Pacific and Antarctic oceans. Prolonged drought hit Australia; that continentâs biggest mammals went extinct. Humans took to caves to make ochre-colour art. Neanderthals died off for good.
Through it all, one giant kauri tree stood tall â until, after nearly two millenniums, it died and fell in a swamp, where the chemical records embedded in its flesh were immaculately preserved.
That tree, unearthed a few years ago near Ngawha Springs in northern New Zealand, finally allowed researchers to fit a tight timeline to what before had seemed like an intriguing but only vaguely correlated series of events.
Scientists Bring Global Pole Shift Fears Into Focus
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