Research ice breaker Polarstern
An Icon of German Polar Research
The Research Vessel Polarstern is the most important resource for German polar research and the flagship of the Alfred Wegener Institute. Commissioned on 9 December 1982, the Polarstern has since logged more than 1.963 million nautical miles, or roughly 3.635 million kilometres (as of June 2025). Today she’s one of the world’s most advanced and versatile polar research ships in the world.
The Polarstern operates an average of 305 days a year, typically cruising in the Antarctic from November to March and pursuing research in the Arctic during the summer months. In the process, she covers ca. 50,000 nautical miles every year – the equivalent of two trips around the Equator. A veritable powerhouse, the research icebreaker can even operate in the pack ice zone: a double-walled steel hull and 20,000 horsepower allow her to easily break through 1.5-metre-thick ice; thicker ice can be overcome by ramming. Further, the Polarstern is equipped for sustained operations at temperatures down to -50 degrees Celsius, and can even overwinter in the ice of the polar seas.
Research and Logistics
Well equipped
Thankfully, it’s not nearly so frosty in the ship’s hold, where a crew of up to 44, plus up to 55 researchers and technicians, work and live. In nine scientific labs, international experts conduct biological, geological and geophysical, but also glaciological, chemical, oceanographic and meteorological research. Though Polarstern has a basic complement of scientific equipment on board, between expeditions she is largely “stripped”: which specific types of lab equipment and which scientific instruments will be required, and whether there is a need for additional lab containers, all depend on the research questions and objectives of the researchers involved in a given expedition.
In addition, the Polarstern normally has two helicopters and inflatable boats on board – which are essential, as they allow the researchers to take measurements and gather data outside of the area influenced by the ship. For example, the helicopters are used for observing whales and deploying equipment like the EM-Bird, a device that can measure ice thickness from the air. An onboard computer system ensures that the countless pieces of scientific data from various projects are regularly recorded, saved and, if need be, forwarded.
The Alfred Wegener Institute’s research stations wouldn’t be able to operate without the Polarstern; for example, the ship is instrumental in resupplying the Neumayer Station III, an Antarctic base manned year-round. The supplies vary from fresh vegetables for the station team, to cutting-edge IT equipment, to the nuts and bolts needed for routine maintenance.
The fact that the Polarstern, originally commissioned in 1982, still counts among the most advanced research ships in the world is also thanks to a complete overhaul: from 1999 to 2001, the ship was refitted to implement the latest technologies available. A successor to the Polarstern is also planned.
News
News from aboard will be available in the Polarstern app. Here you can download the reports additionally as weekly reports:
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PS 150 | 16.-24. Oktober 2025
PS 150 | 09.-10. Oktober 2025
Polarstern on tour
News
Taking to the highsea with a young research spirit
On board the Polarstern research vessel, an international group of young scientists will immerse in the fascinating world of marine research. They are not only learning the basic methods of oceanography, but also the difficult art of communicating science in a comprehensible and inspiring manner. For the fifth time now, the Alfred Wegener Institute is organising this extraordinary training programme with a host of partners.
Investigating unexplored ocean currents to the north of Greenland
The scarcely explored region to the north of Greenland was the area of study in the last of three Arctic expeditions undertaken by the Polarstern since the end of May 2025. In the largely untraveled waters north and northeast of Greenland, a research team led by physical oceanographer Torsten Kanzow of the Alfred Wegener Institute were able to collect unique data on ocean circulation in the area. A chain of six moorings was also deployed to conduct autonomous measurements over the course of a full year.
Important phenomenon discovered in the Arctic
An international study led by the University of Copenhagen and involving the Alfred Wegener Institute has discovered an important phenomenon under the Arctic sea ice that was previously thought to be impossible: So-called non-cyanobacteria can also fix nitrogen under Arctic conditions, which in turn could have an impact on the food web and the carbon budget in the cold north, as the researchers now report in the journal Communications Earth and Environment.