Arctic Ocean entering ‘new era’, say Norwegian scientists
The Norwegian Young Sea Cruise aims to study the thin, young sea ice during the peak melting season
According to Norwegian scientists, the Arctic Ocean seems to be entering “a new era” due to profound changes in the region’s ice cover.
A transition from a thick ice layer to a thinner one which melts and subsequently vanishes in the summer will have far-reaching consequences on climate change, they warned.
The Norwegian Polar Institute (NPI), which deals with polar research, sent an expedition to the Arctic Ocean in December last year. The aim is to study oceanographic properties, the marine ecosystem, the ice itself, radiation, meteorological parameters, ice dynamics and ice mechanics, according to the NPI website.
The cruise
NPI launched the cruise named the Norwegian Young Sea ICE Cruise (N-ICE2015) last year in December. It aims to study the thin, young sea ice during the peak melting season in late July and early August. As part of the trip, a research vessel, the Lance, was deployed and allowed to drift with the pack-ice.
Institute director Jan-Gunnar Winther said measuring what happens in the winter season was vital as it would improve the scenario for climate change in future.
“We have almost no data from the Arctic Ocean in winter—with a few exceptions—so this information is very important to be able to understand the processes when the ice is freezing in early winter and we’ll also stay here when it melts in the summer,” he was quoted by the BBC as saying.
In September 2012, the institute had witnessed the smallest sea ice extent on record in the Arctic. “A new era has entered, we are going from old ice to young ice, thinner ice and the climate models used today have not captured this new regime or ice situation,” he added.
The expedition will attempt to provide a comprehensive view of all the key aspects of the Arctic Ocean.
Younger, thinner ice
The most important focus of the expedition is to examine the consequences of the Arctic Ocean having less of the so-called multi-year ice—older floes which have survived for years—and a greater proportion of younger ice which is thinner (see pic below).
“Typically, there’s much less life underneath first year ice—multi-year ice is more complex, with more ridging and typically has more animal life,” Haakon Hop, who is leading the team, was quoted by the BBC as saying.
According to Hop, both biodiversity and biomass have gone down in the Arctic region. The abundance of animals that live underneath the ice—crustaceans, amphipods, and copepods—have reduced. “(This) is a very serious concern because these animals are important prey items for sea birds feeding on the ice edge and for the marine animals that feed on them,” he said.
Second opinion
Another biologist, Philipp Assmy, has a different thing to say. According to Assmy, it is important to understand how some species may benefit from the ocean having less ice cover as more sunlight will allow plankton to flourish while others will suffer.
“We know that the organisms living in the ocean will actually increase because there will be more light available for them to grow. On the other hand, the organisms living within the sea-ice are likely going to decline as their habitat deteriorates and that will have cascading effects on the large charismatic marine mammals we are all familiar with,” he said.
Scientists say data gathered from the ice is invaluable as a way of calibrating measurements taken by satellites and overflights.
However, the work is not without risks. It involves operating in freezing conditions and there is a threat from polar bears too.
According to Winther, the younger ice more prevalent in the Arctic now is more mobile. “We know that the ice drift is faster now than it was 100 years ago.”