قالب وردپرس درنا توس
Home / Science / The Canadian Arctic has experienced the hottest temperatures for over 100,000 years

The Canadian Arctic has experienced the hottest temperatures for over 100,000 years



Melting glaciers reveal plants that have been buried in the Canadian Arctic for 40,000 years in the hottest century of 100,000 years.

  • Researchers at 30 locations on Baffin Island collected ancient plants in a new study
  • The analysis also revealed that the modern century is the hottest of the last 115,000 years.
7:35 EST, January 29, 2019 |

Rising global temperatures have quickly discovered ancient landscapes that had buried themselves under the ice for tens of thousands of years.

A New Study on Plants Collected by 30 Ice caps on Canada's Baffin Island suggest that the vegetation was exposed only after 40,000 years of uninterrupted ice cover.

This could be the warmest century in the region in 115,000 years.

If warming continues at these rates, researchers warn that the icy island could be completely ice-free within centuries.

Scroll down for videos

  Rising global temperatures have quickly discovered ancient landscapes buried under the ice for tens of thousands of years. File photo

Rising global temperatures have quickly uncovered ancient landscapes that had been buried under the ice for tens of thousands of years. File photo

In a recent study published in the journal Nature Communications, the team analyzed 48 plant samples from all of Baffin's ice caps, including old moss and lichen, which had been preserved in their original growth locations for a long time.

The last decades have brought unusually high summer temperatures to the region.

"The Arctic is currently warming two to three times faster than the rest of the world, so naturally glaciers and ice caps will react faster," said Simon Pendleton, lead author and Ph.D. student at CU Boulder's Institute for Arctic and Alpine Research (INSTAAR ).

The researchers collected samples from the site last August and collected old plants from different altitudes and expositions.

They also took samples of quartz at the collection points to determine the age and history of the ice cover.

"We travel to the retreating ice margins and try out newly exposed plants conserved in these ancient lands. Cloves and carbon dioxide date the plants to get a sense of when the ice has last penetrated this place," said Pendleton.

"As dead plants are efficiently removed from the landscape, the radiocarbon age of rooted plants is the last time that summer was on average as warm as that of the previous century. "

  The researchers took samples in August of this year and collected old plants from different altitudes and expositions. Two of these sites are shown above

The researchers collected samples from the site last August and collected old plants from different altitudes and expositions. Two of these sites are shown above

  In a recent study published in the journal Nature Communications, the team analyzed 48 plant samples from Baffin's icecaps, including old moss and lichens that had been kept in their original growth positions for a long time

In a new study Published in the journal Nature Communications, the team used radiocarbon dating to analyze 48 plant samples from Baffin's ice caps, including old moss and lichens that had been preserved in their original growth positions for a long time.

The researchers analyzed the samples in the lab and compared historical data reconstructed from ice cores to see what has changed.

The results point to the modern temperatures in this arctic region has been the hottest ever since the last 115,000 years.

"Unlike biology, which has developed plans in the last three billion years to avoid being affected by climate change, glaciers have no survival strategy". said Gifford Miller, senior author of research and professor of geological sciences at CU Boulder.

"They are good-natured and respond directly to the summer temperature. When the summer gets warm, they step back immediately. When the summers cool, they prefer.

WHAT ARE THE EFFECTS OF ICEWORKS IN THE BOTTOM LAKE?

The number of Arctic sea ice summits is approaching in March, as winter comes to an end Sea ice has been low this year, following three more low-level measurements in 2015, 2016 and 2017.

This can lead to a range of negative impacts affecting climate, weather patterns, plant and animal life, and indigenous human communities.

  The amount of sea ice in the Arctic is sinking and this has dangerous consequences, says NASA.

The amount of sea ice in the Arctic is decreasing and this has dangerous consequences, says NASA

Moreover, the vanishing ice can alter shipping routes and affect coastal erosion and ocean currents.

NASA researcher Claire Parkinson said: Cover The tendency to weaken trends is related to the ongoing warming of the Arctic.

"This is a one-way street: Warming will cause less ice to form and more ice to melt, but less ice will cause less sunshine to reflect from the sun, contributing to warming. & # 39;

"This makes them one of the most reliable proxies for summer temperature changes."

The trends observed in all samples are unusual, the researchers note, and are indicative of the rapidly changing environment.

"Normally one would expect the age of the plants to be seen in different topographical conditions," Pendleton said.

"For example, a high-altitude location could hold on to its ice for longer. But the extent of the warming is so great that everything is melting everywhere now.

"We have never seen anything so pronounced."

Advertising


Source link