Weekly Reports Polarstern

The Expedition PS109 to the Arctic (Tromsø - Bremerhaven)

The retreat of the ice sheet of Greenland strongly contributes to global sea level rise. The Northeast Greenland Ice Stream thereby transports ice masses toward the continental shelf of western Fram Strait, where its outlet glacier – the 79°N Glacier – is in direct contact with the warm Atlantic Waters recirculating in Fram Strait. Given that the Atlantic Water has been warming in this area while at the same time the 79°N Glacier has begun to show signs of retreat of its floating ice tongue, it is the goal of the expedition “Greenland ice sheet/ocean interaction” (GRISO) to study the complex interactions between the ocean and the ice sheet of Northeast Greenland. In this framework scientists from the disciplines of physical oceanography, geochemistry, glaciology, geodesy, geology, geophysics, atmospheric physics and chemistry, biology and biochemistry will work closely together with each other aboard the research icebreaker RV Polarstern. The vessel will depart from Tromsø, North Norway, on 12 September. Over the course of the expedition, marine studies on the continental shelf close to the Greenland coast will be combined with fieldwork on both the floating ice tongue of the 79°N Glacier and the adjacent near-coastal mainland. We thereby build on studies that were carried out aboard RV Polarstern in summer 2016. The expedition will end on 14 October in Bremerhaven.

PS109 - Weekly Report No. 3 | 2 - 8 October 2017

On the outer shelf

[10. October 2017] 

In the beginning of the week we left the coast of Greenland. Leaving icebergs and sea ice behind us, we steamed in a south-easterly direction along the axis of Norske Trough toward the mid-shelf, where both a sill can be found in the trough and the northern slope toward the shallow Belgica Bank is particularly steep. In this location we expected to find the inflow of the Atlantic Water to be particularly focussed as a boundary current.

PS109 - Weekly Report No. 3 | 25 September - 1 October 2017

Between Ile-de-France and Norske Oer

[05. October 2017] 

This week started with a disappointment. As a result of very dense sea ice coverage we were unable to recover 3 moorings deployed near the northern edge of the embayment of the 79°N Glacier, in order to observe the circulation at the transition from Norske Trough in the south to Westwind Trough in the north.

PS109 - Weekly Report No. 2 | 18 - 24 September 2017

At the 79°N Glacier

[26. September 2017] 

We are looking back on a very active and exciting week. In the beginning our work was still concentrated on the area of the shelf break of Northeast Greenland at the mouth of Westwind Trough, with the latter representing a depression leading toward the inner shelf. In the trough relatively warm Atlantic Water can be found near the sea floor.

PS109 - Weekly Report No. 1 | 12 - 17 September 2017

The forerunners of Greenland

[19. September 2017] 

In the evening of 12 September the research icebreaker R/V Polarstern left the port of Tromsø (Norway). On board there are scientists from seven nations who cover the range from physical oceanography, geochemistry, glaciology, geodesy, geology, geophysics, atmospheric physics and chemistry as well as marine biology and  biogeochemistry. The aim of the “Greenland ice sheet/ocean interaction” (GRISO) expedition is to unravel the complex physical interactions between the ocean and the ice sheet of Northeast Greenland, as well as their implications for...

PS108 - Weekly Report No. 2 | 29 August - 6 September 2017

New technical possibilities in the deep sea

[08. September 2017] 

The second week of our expedition was in focus of the in ROBEX new developed robotic systems.