Despite adverse ice conditions, resupply icebreaker reaches the MOSAiC expedition

Reaching the floe! Photo: Alfred-Wegener-Institut / Steffen Graupner

Nevertheless, she steadily drew closer to her destination, and finally, at 12:20 pm (CET) on Friday, 28 February, dropped anchor 970 metres from Polarstern, moored to the same floe. While the handover is in full swing on the MOSAiC floe, in Russia another icebreaker will soon leave port in order to supply Kapitan Dranitsyn with additional fuel on her return trip.

This past week there were not one, but two new records in the history of polar research, as the University of Cambridge’s Scott Polar Research Institute has reported: on 24 February Polarstern’s drift took her to 88°36’ North, just 156 kilometres from the North Pole.

Never before had a ship ventured so far north during the Arctic winter. And two days later, the Russian icebreaker Kapitan Dranitsyn, shortly before her rendezvous with Polarstern at 88°28’ North, reached the northernmost position on her mission, marking the first time a ship had made it so far north under her own power, so early in the year.

“These records represent milestones in the MOSAiC expedition. They demonstrate the success of the logistical concept, and provide the basis for the unprecedented scientific data that is being gathered during the expedition,” says Prof Markus Rex from the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) in Potsdam, Leader of the MOSAiC expedition.

“My hat goes off to Captain Alexandr Erpulev for successfully navigating the icebreaker Kapitan Dranitsyn through the Arctic winter and virtually to the North Pole,” adds Polarstern Captain Stefan Schwarze, underscoring this nautical achievement. “Given the current sea-ice situation, the delay is absolutely in keeping with what had to be expected,” Rex emphasises. Following the first few months of the expedition, Rex returned from the Arctic on board Kapitan Dranitsyn and will return to Polarstern in April.

Together with the Logistics Division of the Alfred Wegener Institute, he’s spent the past several days working out how to provide the resupply icebreaker with additional fuel. Since the fast sea ice forced Kapitan Dranitsyn to consume more fuel than originally planned, the icebreaker Admiral Makarov is expected to depart from Murmansk on 3 March and follow an intercept course with Kapitan Dranitsyn, so as to refuel the latter in the Arctic sea ice.

The exchange of staff and equipment is taking place on foot, with snowmobiles and with snowcats hauling heavily laden sledges. On board Polarstern and in the Ice Camp, the new expedition members are being instructed on various tasks by their predecessors. Extreme caution is the prime rule, especially when working on the ice, where the wind-chill temperature can now reach 58 degrees below zero Celsius.

Thanks to these extreme temperatures, only a day after her arrival, the channel of open water left behind by Kapitan Dranitsyn had refrozen so rapidly and intensively that the researchers could walk on it. The temperatures also pose a problem when it comes to transferring provisions; for example, fresh produce has to be transported in heated containers. It’s still too soon to say how long the transfer of crew and equipment will take to complete, partly because the two ships’ cranes only work very slowly in the frigid conditions.

Shortly before beginning the journey home, Prof Christian Haas from the Alfred Wegener Institute, Chief Scientist for the second leg, took stock of the situation. According to the sea-ice expert, “Over the past few months, we’ve been able to observe winter at the North Pole more consistently and precisely than ever before. The ice thickness has doubled to an average of 160 centimetres since December, which corresponds to a growth rate of roughly ten centimetres per week.”

In addition, with the aid of helicopter laser-scanner readings, Polarstern’s radar system, and buoys, the researchers were able to observe how the ice deformed, and channels opened and closed again. Thanks to the warming of the Arctic Ocean, smaller and thinner ice floes are becoming more common. Driven by the wind, they can collide and overlap, producing pack ice hummocks up to four metres tall. Since a great deal of their mass lies underwater, some hummocks are 20 to 30 metres thick – a phenomenon that now represents a challenge for the resupply icebreakers.

In contrast, readings taken on the ice, on board ship, and with weather balloons revealed that the air temperature just above the ice was far lower than at a height of 20 metres. In the lowermost ten metres there can be temperature differences of more than 4 degrees Celsius, which has a major influence e.g. on the increase in ice thickness. Lastly, ROV dives showed how life under the ice goes on, even in the long Polar Night.

“We’ve never had the opportunity to study the zooplankton and polar cod up here so extensively at this time of year. In February we even repeatedly saw a seal under the ice, which is apparently finding sufficient food, despite being practically at the North Pole. And on the surface, we sighted a polar bear and several Arctic foxes,” says Christian Haas, summarising recent observations.

Sometime in the next few days Prof Torsten Kanzow from the Alfred Wegener Institute, who arrived on Polarstern by helicopter last Wednesday, will take over as Chief Scientist for the third leg of the journey. This phase of the expedition will in part be characterised by the return of daylight. Even now, there is a perceptible several-hour-long phase of twilight each day, which also makes the cargo transfer a bit easier to manage.

Over the next few weeks the sea ice will become even denser, which is why the next exchange, in April, will most likely be done by plane. For this purpose, the snowcats were used to prepare a 900-metre-long airstrip on the ice. In addition to the flights for exchanging staff and crewmembers, the third leg will also include scientific missions with the research aeroplanes Polar 5 and Polar 6, which will then be based in Svalbard and are slated to make flights to the still drifting Polarstern.

The expedition in numbers

From 13 December 2019 to 27 February 2020, the Transpolar Drift carried Polarstern a total distance of 672 kilometres; however, given the meandering course of the drift, the ship only covered a linear distance of 406 kilometres.

In the same period, the top drift speed, 1.7 kilometres per hour, was reached on 1 February 2020.

The expedition came within 156 kilometres of the North Pole.

Using snowcats, engineers created a 900-metre-long airstrip on the ice.

On 1 February the air temperature plummeted from an unseasonably warm minus 11.4 degrees to minus 38.2 degrees Celsius, the most intense cold snap observed during this leg of the expedition.

During the second leg of the journey, the expedition members and crew consumed 8,100 eggs, 1,360 kg of potatoes, and 86 jars of Nutella. Needless to say, that’s not all they ate.

The longest excursion was a ski tour to an automated monitoring station roughly 10 kilometres from Polarstern. The entire tour was completed in total darkness.

Only 1 polar bear was sighted during this leg – at night, by an automated camera that just happened to snap a photo while the bear was sniffing the instruments at the remote sensing station.

Due to fog and a major snowstorm, there were 3 days on which work out on the ice had to be suspended.

The experts gathered 34.3 terabytes of data.

Background information on MOSAiC:

On the MOSAiC expedition, experts from 20 nations will study the Arctic for an entire year. For this purpose, from autumn 2019 to autumn 2020 the German icebreaker Polarstern will drift across the Arctic Ocean, trapped in the sea ice. MOSAiC is being coordinated by the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI). In order for the unprecedented project to be a success and produce as much valuable data as possible, over 80 scientific institutes are working together in a research consortium. The expedition’s total budget is over 140 million euros.

For the latest news straight from the Arctic, check the MOSAiC channels on Twitter (@MOSAiCArctic) and Instagram (@mosaic_expedition) using the hashtags #MOSAiCexpedition, #Arctic and #icedrift.

For further information on the expedition, visit us at: www.mosaic-expedition.org

Or you can use the MOSAiC Web App to track Polarstern’s drift route and follow events on-site live: www.follow.mosaic-expedition.org

Notes to Editors:

Printable images are available in the online version of the press release: https://www.awi.de/en/about-us/service/press.html

For any questions please contact Sebastian Grote, Dept. of Communications and Media Relations (e-mail: media(at)awi.de).

The Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) conducts research in the Arctic, Antarctic and oceans of the high and mid-latitudes. It coordinates polar research in Germany and provides major infrastructure to the international scientific community, such as the research icebreaker Polarstern and stations in the Arctic and Antarctica. The Alfred Wegener Institute is one of the 19 research centres of the Helmholtz Association, the largest scientific organisation in Germany.

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Ralf Röchert idw - Informationsdienst Wissenschaft

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