Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Oasis of life in the ice-covered central Arctic

24.10.2016

Scientists are exploring oceanic ice worlds with new robots

Under the ice of the Arctic, unknown habitats conceal an unexpected variety of living beings. On October 23rd, 46 scientists are expected to return to the home port in Bremerhaven from an Arctic expedition with the research vessel Polarstern. Over the past six weeks, they had explored life in ice, ocean and seabed with new robots and camera systems.


Pillow lavas (Photo: AWI OFOS)

The ice-covered, central Arctic Ocean beyond 85° North is known for its harsh climate, low productivity and poor colonisation by marine animals. Because of the difficult ice and climate conditions, only a few scientists have had the opportunity to explore this region extensively. The current Polarstern Expedition PS101 had the goal of exploring underwater sea-beds and deep-sea trenches of the central Arctic Ocean and investigating how ice, ocean and life have changed due to the massive ice decline of recent years.

Already in the year 2001 during a German-American expedition with the research breakers Polarstern and Healy, many seamounts along the Gakkel Ridge of the Central Arctic were surveyed, but until now it lacked marine technology to dive down to them. One of the largest seamounts of the Gakkel Ridge is the Karasik seamount, discovered in 2001 and rising from a depth of 5000 m to 650 m. Seamounts are generally regarded as oases of life in the ocean as they provide marine animals with a variety of habitats and food sources. But whether they are also richly populated in the icy Arctic, which is scarce in food, has so far been unexplored.

“With the first pictures of the summit of the Karasik seamount we did not believe our eyes: It is overgrown with huge globular sponges. Between the sponges lie centimetre-thick mats of needles and worm-burrows. We were able to observe different species of fish which were not to be expected here, and caught a glimpse of the northernmost corals discovered so far. There are huge white starfish, blue snails, red crabs and white and brown clams between the sponges”, reports chief scientist Prof. Dr. Antje Boetius from the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI), regarding the first dives under the ice. The plankton, which mainly float in the water, especially crabs, jellyfish and worms, also brought astonishment to the explorers.

The deep sea robot NUI of the American marine research institute WHOI, a prototype for the exploration of ice-covered oceanic worlds, filmed the hitherto unknown deep under the ice and collected specimens for the species determination. It dived repeatedly to the sponges of the Karasik seamount. The giant sponges are up to a metre in size, hundreds of years old and seem to be able to move on their needles. They are, in turn, a habitat for innumerable animals that find themselves at home in the sponges.

The researchers found a particularly extreme habitat under the ice at hot springs in the valley of the Gakkel Ridge. On a still unnamed volcanic lake, the team encountered ghostly structures of freshly solidified lava rock, between which hot water rose out of small vents and cracks - at an ambient temperature below the freezing point. They observed vanes of hydrogen and methane above the hot springs used by special deep-sea bacteria as a food source. In addition to swarms of crustaceans, sea anemones and bacterial mats, fish and many fish skeletons were found at the hydrothermal vents. The researchers therefore assume that the hydrothermal activity feeds energy into the food web of the deep sea.

Climate change also plays an important role in the Karasik seamount region. The AWI ice physicist Dr. Marcel Nicolaus summarises the observations: "This year's thin ice in the study region confirms the long-observed trend. While in the 1990s, the Polarstern had to sail around two or three metres thick ice floes in the investigation area, in 2001 the first surveying of the seamounts was with less than two metres in average sea ice thickness. At the moment, we have mainly found thicknesses of less than one metre and hardly any more large ice-floes." The sea ice explorers have released a series of autonomously drifting ice buoys during the expedition to monitor the sea ice and the climate of the Arctic and to improve the predictions for the change of the Arctic.

The international expedition has profited from the development of technology at the joining between deep sea and space exploration. Researchers and engineers from the Helmholtz Initiative ROBEX (Robotic Exploration of Extreme Environments) have collaborated with NASA's PSTAR program (Planetary Science and Technology Analog Research). Project leader Chris German (WHOI) notes: "The Earth is only one of up to ten planetary bodies of our solar system on which ice-covered oceans are suspected. From the PS101 expedition to the ice-covered Arctic, we were able to learn about technologies for exploring other planetary oceanic environments."

The Polarstern will spend the next two and a half weeks on routine maintenance and repair work at the Bremerhaven Lloyd shipyard. The research and supply vessel will start to the Antarctic season on the 12th of November 2016. On the transit to the south, a training course for international young scientists will take place. Until the spring of 2017, oceanographic and geoscientific expeditions as well as the supply of the Neumayer Station III will be on the agenda.

Notes for Editors:

Please find printable images in the online version of this press release at http://www.awi.de/nc/en/about-us/service/press.html.

Your scientific contact persons are Professor Antje Boetius (e-mail: Antje.Boetius(at)awi.de) and Dr Marcel Nicolaus (e-mail: Marcel.Nicolaus(at)awi.de).

Your contact person in the Dept. of Communications and Media Relations is Dr Folke Mehrtens, tel. +49 471 4831-2007 (e-mail: Folke.Mehrtens(at)awi.de).

Follow the Alfred Wegener Institute on Twitter (https://twitter.com/AWI_Media) and Facebook (http://www.facebook.com/AlfredWegenerInstitute).

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 18 research centres of the Helmholtz Association, the largest scientific organisation in Germany.

Ralf Röchert | idw - Informationsdienst Wissenschaft
Further information:
http://www.awi.de/

More articles from Earth Sciences:

nachricht Atmospheric scientists reveal the effect of sea-ice loss on Arctic warming
11.03.2019 | Institute of Atmospheric Physics, Chinese Academy of Sciences

nachricht Sensing shakes
11.03.2019 | University of Tokyo

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Stellar cartography

The Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) at the Large Binocular Telescope (LBT) in Arizona released its first image of the surface magnetic field of another star. In a paper in the European journal Astronomy & Astrophysics, the PEPSI team presents a Zeeman- Doppler-Image of the surface of the magnetically active star II Pegasi.

A special technique allows astronomers to resolve the surfaces of faraway stars. Those are otherwise only seen as point sources, even in the largest telescopes...

Im Focus: Heading towards a tsunami of light

Researchers at Chalmers University of Technology and the University of Gothenburg, Sweden, have proposed a way to create a completely new source of radiation. Ultra-intense light pulses consist of the motion of a single wave and can be described as a tsunami of light. The strong wave can be used to study interactions between matter and light in a unique way. Their research is now published in the scientific journal Physical Review Letters.

"This source of radiation lets us look at reality through a new angle - it is like twisting a mirror and discovering something completely different," says...

Im Focus: Revealing the secret of the vacuum for the first time

New research group at the University of Jena combines theory and experiment to demonstrate for the first time certain physical processes in a quantum vacuum

For most people, a vacuum is an empty space. Quantum physics, on the other hand, assumes that even in this lowest-energy state, particles and antiparticles...

Im Focus: Sussex scientists one step closer to a clock that could replace GPS and Galileo

Physicists in the EPic Lab at University of Sussex make crucial development in global race to develop a portable atomic clock

Scientists in the Emergent Photonics Lab (EPic Lab) at the University of Sussex have made a breakthrough to a crucial element of an atomic clock - devices...

Im Focus: Sensing shakes

A new way to sense earthquakes could help improve early warning systems

Every year earthquakes worldwide claim hundreds or even thousands of lives. Forewarning allows people to head for safety and a matter of seconds could spell...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

International Modelica Conference with 330 visitors from 21 countries at OTH Regensburg

11.03.2019 | Event News

Selection Completed: 580 Young Scientists from 88 Countries at the Lindau Nobel Laureate Meeting

01.03.2019 | Event News

LightMAT 2019 – 3rd International Conference on Light Materials – Science and Technology

28.02.2019 | Event News

 
Latest News

Levitating objects with light

19.03.2019 | Physics and Astronomy

New technique for in-cell distance determination

19.03.2019 | Life Sciences

Stellar cartography

19.03.2019 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>