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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 atmospheri...

Abstract 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 [41 to 42 thousand years ago (ka)]. We use ancient New Zealand kauri trees (Agathis australis) to develop a detailed record of atmospheric radiocarbon levels across the Laschamps Excursion. We precisely characterize the geomagnetic reversal and perform global chemistry-climate modeling and deta...

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 so...

Ancient Northland swamp kauri solves 42,000 year old mystery 21 Feb, 2021 05:00 PM 7 minutes to read Some of this giant ancient swamp kauri tree uncovered at Ngāwhā has been used by researchers to confirm the date when the Earth reversed its magnetic poles. Photo / Peter de Graaf Northern Advocate Ancient swamp kauri from Northland has been used to confirm a temporary breakdown of Earth's magnetic field 42,000 years ago sparked major climate shifts leading to global environmental change and mass extinctions. A new international study using ancient swamp kauri from Ngāwhā shows this dramat...

Ancient relic points to a turning point in Earth's history 42,000 years ago Just like in The Hitchhiker's Guide to the Galaxy, the answer was 42   Sunday PM (SitNews) - The temporary breakdown of Earth's magnetic field 42,000 years ago sparked major climate shifts that led to global environmental change and mass extinctions, a new international study co-led by UNSW Sydney and the South Australian Museum shows. This dramatic turning point in Earth's history - laced with electrical storms, widespread auroras, and cosmic radiation - was triggered by the reversal of Earth's ma...