Digging for clues concerning the North Pole’s previous

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Digging for clues concerning the North Pole’s previous


a view down the side of the ship at near water level
The ship’s crew and researchers get better the sediment corer, a 25-meter-long metal pipe that’s pushed into the seafloor utilizing a prime weight of greater than three metric tons.

TIM KALVELAGE

the crew in a line with the long pipe hoisted over their shoulder
Collectively, the scientists pull out lengthy plastic pipes stuffed with treasured deep-sea mud.

TIM KALVELAGE

rows of the cut pipes with plastic syringes inserted at intervals
The pipes are minimize into shorter items and break up in half earlier than being processed within the ship’s laboratories. Every of those one-meter sections covers a number of tens of hundreds of years of Earth’s historical past.

TIM KALVELAGE

Whereas sediment cores a number of meters lengthy had been recovered on earlier expeditions within the central Arctic, there isn’t any scientific consensus on how previous the deposits really are or whether or not sea ice ever utterly disappeared in summer time. 

To decode the Arctic’s local weather archive, Knies introduced a workforce of specialists from varied disciplines onboard the Kronprins Haakon to dig deeper and acquire recent samples they might topic to the newest analytical strategies.   

a tray of square samples
Samples await paleomagnetic relationship. Like tiny compass needles, iron-rich particles align with Earth’s shifting magnetic discipline as they decide on the seabed. By measuring their orientation, researchers can estimate the age of the totally different sediment layers.

TIM KALVELAGE

closeup of hands holding an instrument to a tray under a microscope
Below the microscope, PhD pupil Paulina Romel picks shells of unicellular foraminifera from a pattern. The chemical composition of those microfossils may give clues concerning the age of the sediment and the floor water temperature when the organisms had been nonetheless alive. “These are actually cool creatures!” says Romel.

TIM KALVELAGE

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Agathe Ollive, a geochemist from the Alfred Wegener Institute in Germany, takes water samples from a CTD rosette, an instrument package deal that measures conductivity (salinity) and temperature at varied depths. She makes use of sure parts to hint the influx of recent water and seawater from rivers and adjoining ocean basins into the Arctic. “I didn’t count on there to be so little ice up right here,” Ollive says. She is apprehensive about how the Arctic will look 20 years from now.

TIM KALVELAGE

A few of this work was achieved whereas the researchers had been nonetheless at sea. Now, at their house laboratories, they’re finalizing their evaluation of the seafloor samples. One essential job is relationship the sediments, which can be as much as 2 million years previous. The workforce makes use of a mixture of strategies to do that, together with measuring magnetization, the decay of radioactive parts, and the publicity of mineral grains to daylight earlier than sinking to the depths. As soon as they’ll place them on a timeline, the supplies within the cores will assist researchers paint an image of what the Arctic Ocean appeared like in occasions that had been hotter than at present. For instance, the presence or absence of the molecule IP25, which is produced completely by ice algae, might inform them how far the ocean ice receded at a given time. 

a sea bird flies past an iceberg
Towards the top of the expedition, the Kronprins Haakon passes this iceberg close to the northeast coast of Greenland.

TIM KALVELAGE

On the finish of the research, the workforce hopes to have information that would enhance local weather projections for a future ice-free “blue Arctic,” serving to us perceive the way it might have an effect on marine life and carbon storage, Atlantic Ocean circulation, or excessive climate occasions in Europe and North America. 

Tim Kalvelage is a contract science reporter based mostly in Bremen, Germany, who focuses on local weather, ocean, and polar analysis. He has been to the North Pole twice.

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