Trees are a allowing us to have a glimpse in the past, because their rings reveal a lot of things about the climate in a year. Examining these rings can reveal if the winter was wet that year, if there were forest fires or there were hurricanes, etc.
On New Zealand’s North Island, Ngawha, people found an ancient tree that has a record of a reversal of our Earth’s magnetic field. This tree -- an Agathis australis, also known as its Māori Kauri -- was discovered during an excavation work for the geothermal power plant, expansion.
Ngāwhā Generation, is the subsidiary of Northland power wholesaler Top Energy, and gave the kauri tree back to iwi, under an agreement scientists could take samples for the research.
The tree was buried 26 feet beneath the Earth, and it measures 65 feet in length and 8 feet in diameter. The carbon dating indicated that the tree lived for 1,500 years, between 41,000 and 42,500 years ago!
Alan Hogg, from the New Zealand’s University of Waikato, said:
There isn’t anything like it in the world! This Ngāwhā Kauri is unique.
The lifespan of this kauri tree is covering a point in the history of our Earth, when the magnetic field almost reversed. The magnetic south and north went on a little excursion, but they didn’t complete a full reversal.
It is said that the magnetic field of our Earth is generated from the Iron in our planet’s core. It is producing electric currents that extend very far in space, as it moves around.
This magnetic field is actually like a barrier, that is protecting the Earth from the solar wind. This stream is from charged particules from the Sun, which can strip away the ozone layer, if it were to affect the Earth’s atmosphere.
When the magnetic field is reversing, it is weaker and it is letting the Sun’s radiation to pass through a lot more. And researchers have previously associated magnetic field reversals with extinction events!
The rings of this tree have a full record of a near-reversal, therefore this is the first time a tree has lived during the event that has been discovered.
It is the time that takes for this movement to happen, that is the critical thin. We’ll map these changes a lot more accurately, using these tree rings.
The kauri tree has unearthed during the Ngāwhā Generation geothermal power plant, expansion.
Researchers currently investigate the examples of the tree and are driven by Chris Turney from the University of New South Wales, a specialist in paleoclimatology and environmental change in the course of recent years. The research is being funded by the Australia Research Council.
Researchers want to get an understanding into what we should expect whenever it happens.
We are going to have elevated cosmic radiation. It’s going to take out satellites, and it can even take out communication infrastructure.
The valuable thing is this immense, desolate tree developed for somewhere in the range of 1700 years over a striking period in our planet’s history when the Earth’s magnetic field flipped exactly 42,000 years ago, a period known as the Laschamp Excursion.
Financed by the Australian Research Council we’re embraced nitty gritty estimations of the radioactive type of carbon through the tree rings.
In the course of the last 83 million years, there have been 183 magnetic pole reversals.
This procedure takes around 7,000 years to finish. Monika Korte, the logical executive of the Niemegk Geomagnetic Observatory at GFZ Potsdam in Germany, says:
It is anything but an unexpected flip, however a moderate procedure, during which the field quality gets feeble, presumably the field turns out to be more mind boggling and may show multiple shafts for some time, and afterward develops in quality and aligns the other way.
As indicated by NASA, magnetic pole reversals happen at random intervals, despite the fact that in the last 20 million years, it seems to have subsided into an example, happening once every 200,000 to 300,000 years.
The last full inversion occurred around 780,000 years back.
As of late, researchers declared that the magnetic north pole had moved surprisingly.
Rather than following consistently from the Canadian Arctic towards Siberia, it accelerated so a lot of that specialists needed to refresh the World Magnetic Model (WMM), which is a portrayal of Earth’s magnetic field.
It is utilized widely in route by the U.S. Branch of Defense, the U.K. Service of Defense and numerous non military personnel frameworks -- so knowing precisely where the northern and southern magnetic poles are is of most extreme significance.
Turney also added:
Because the magnetic field of the Earth has a huge effect on how much radiocarbon carbon is created in the Earth’s upper atmosphere, these analyses are going to enable us to investigate the rate and magnitude of change when the magnetic field reversed during the Lastchamp.
Something that was not possible before, and it is of great interest given recent changes in our Earth’s magnetic field.