New equipment for the AWI-"Gardener": Expansion of the deep-sea long-term observatory AWI-Hausgarten
Scientists from the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) are setting out with the research vessel Polarstern towards Spitsbergen, to use newly developed equipment in the Arctic Ocean.
Autonomous instruments on the seabed, in the water column and in the air will complement the long-term measurements of the deep-sea research group. In this way researchers can analyse the climatic changes in the Arctic and their impact on the fauna in the future with higher temporal and spatial resolution.
For the first time the Autonomous Underwater Vehicle (AUV) "Tramper" will be set on its own for a year on the Arctic seabed. "The newly developed device is to measure oxygen along the depth gradients on a weekly basis. In this way we want to quantify how the sediment-dwelling marine organisms remineralize the biomass on the sea floor," explains Dr Thomas Soltwedel, deep-sea ecologist at the AWI and chief scientist of the expedition.
The scientists want to close a knowledge gap: How are climate-induced changes in the productivity by algae on the water surface as well as in and under the sea ice temporally coupled to the export of nutrients in the deep-sea? And how are the deep-water organisms reacting to the presumably strong variability in food availability?
Above the Tramper working on the deep-sea floor, a further mobile measuring instrument is to be used: The autonomous underwater vehicle AUV named PAUL floats on a pre-programmed course through the water column, takes samples and simultaneously detects a wide range of environmental factors.
Equipped as a small laboratory, PAUL measures the water temperature, salinity, the concentration of nitrate, chlorophyll a and oxygen, as well as various organic substances and the intensity of photosynthetically active radiation. Additionally, PAUL collects water samples, from which the scientists can filter and determine the micro-organisms of plankton. Using an additional built-in acoustic Doppler current metre (ADCP), the physical properties along the melt-water border on the edge of the ice of the Arctic Ocean are to be investigated.
In order to exactly understand the ice conditions above the profile of PAUL, they will use autonomous flying devices. The so-called UAV (Unmanned Aerial Vehicle) records the thickness of the snow cover in addition to the ice coverage. For example, it can then be determined to what extent sunlight as energy reaches the ocean under the ice. One of the UAV places GPS transmitters on the sea ice to record the ice drift. The observed data will be used to program the route of the autonomous underwater vehicle.
The newly developed devices complement the long-term measurements, which the Helmholtz-Manx Plank Joint Research Group for deep-sea technology and ecology have been performing for more than 15 years in the so-called AWI Hausgarten (which means house garden) between Spitsbergen and Greenland. Resources of the Helmholtz infrastructure measure FRAM (Frontiers in Arctic Marine Monitoring) have been used to improve and to expand the long-term studies at the AWI-Hausgarten
Before "Polarstern" sails into the Hausgarten, two Italian working groups are using the voyage to travel from Bremerhaven to the North for their research. South of Spitsbergen, the geodynamic and hydrographic conditions and the gas leaks at the bottom of the Kveithola Trench are the focus of the research program. Another focus is on the exploration of spatial and temporal changes in the deep ocean currents southwest of Spitsbergen. Both projects are being carried out in the frame of the EU Eurofleets programme.
RV Polarstern will leave Bremerhaven on Monday, the 13th June 2016 with the high-tide in the evening at 7 pm. A large part of the nearly 50 participants of the scientific expedition participants will be debarking on June 23 during a short stopover in Longyearbyen, Spitsbergen. Here the deep-sea researchers embark and work on board until their expedition ends on 16th July in the Norwegian Tromsø. Then "Polarstern" focusing on oceanography takes course towards Greenland, where the interactions between the ocean and a glacier at 79 degrees North are to be examined. The last Arctic expedition in 2016 takes place in the Central Arctic, before the research vessel is expected to return to its homeport of Bremerhaven at the end of October.
Notes for Editors:
Your contact person in the Dept. of Communications and Media Relations is Dr Folke Mehrtens, tel. +49 (0)471 4831-2007 (e-mail: Folke.Mehrtens(at)awi.de).
Printable images are available in the online version of this press release: http://www.awi.de/nc/en/about-us/service/press.html
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
The melting ice makes the sea around Greenland less saline
16.10.2017 | Aarhus University
WSU researchers document one of planet's largest volcanic eruptions
12.10.2017 | Washington State University
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
It's possible to produce hydrogen to power fuel cells by extracting the gas from seawater, but the electricity required to do it makes the process costly. UCF...
Mercury, our smallest planetary neighbor, has very little to call an atmosphere, but it does have a strange weather pattern: morning micro-meteor showers.
Recent modeling along with previously published results from NASA's MESSENGER spacecraft -- short for Mercury Surface, Space Environment, Geochemistry and...
10.10.2017 | Event News
10.10.2017 | Event News
28.09.2017 | Event News
16.10.2017 | Physics and Astronomy
16.10.2017 | Earth Sciences
16.10.2017 | Physics and Astronomy