Busack, Michael

Hagemann, Jonas

Lehmenhecker, Sascha

English

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AUV- Team: Engineering at Alfred-Wegener-Institute  Michael Busack, Jonas Hagemann, Sascha Lehmenhecker, Autun Purser       WSC:   West Spitsbergen Current EGC:    Eastern Greenland Current RAC:    Return Atlantic Current YB/SB: Yermak/Svalbard Branches              of the West Spitsbergen         Current Deep-Sea Group  AWI Long-Term Ecological Research site HAUSGARTEN  •  17 stations •  1000 - 5500 m •  continuous sampling    and measurements •  repeated sampling •  visual observations •  since 1999 •  experimental work •  bathymetric and     latitudinal transect T. Soltwedel Deep-Sea Group  Instruments used at LTER HAUSGARTEN  (KDM & Medieningenieure Bremen) Vehicles AUV PAUL  Model: BF-21  Purposes: Research, pelagic and benthic  Maximum Depth: 2444 / 3000 m  Length: 4 – 6 m depending on payload  Weight in air: 500 / 600 kg  Endurance: 8:26 h / 47.7 km   Speed: Up to 4.5 kts    AUV SARI  Model: BF-SandShark  Purposes: Training, Education, Development  Maximum Depth: 200 m  Length: 51 – 120 cm depending on payload  Weight in air: 5 – 15 kg / Man-Portable  Endurance: 4 h / 10 km  Speed: Up to 2 – 4 kts  Pelagic Benthic Vehicles  PAUL Vehicles  PAUL  Pelagic Pelagic 4,3 CTD ADCP Payload Control Computer Nitrate Sensor PAR Sensor Chl. a fluorometer (not visible)  CDOM fluorometer (not visible) Dissolved Oxygen Sensor (not visible) Microstructure Probes Microstructure Probes Sample Collector Vehicles  PAUL  Pelagic AUV PAUL  Model: BF-21  Maximum Depth: 3000 m  Length: 4 – 6 m depending on payload  Weight in air: 600 kg  Endurance:     Vehicles  PAUL  Pelagic Vehicles  PAUL  Pelagic Float Maneuver:  Thruster deactivated  -> Vehicle ascends slowly   -> Little disturbance of surface        water stratification  -> High resolution vertical profile  Repeated Floats for 3D investigation  - 3m  - 50m 10 m thick melt water layer (salinity < 34.5 g/kg) Chlorophyll a concentration:  > 2.5 µg/l > 4.0 µg/l Ascend path during Float maneuver Dive in Arctic Marginal Ice Zone:   -> Chlorophyll a as tracer for phytoplankton        and marine primary production  -> Almost synoptic, volumetric investigation        of phytoplankton standing stock  -> “Patchy” distribution of        phytoplankton along ice edge Salinity > 35 g/kg < 35 g/kg Vehicles  PAUL  Benthic Benthic Payload Control Computer Camera Fwd. Strobe Sonar Electronics Sonar Transducer Vehicles  PAUL  Benthic Vehicles  PAUL  Benthic  Side-Scan-Sonar 4.5 m 2.7 m Image Area: 12.15 m2  || Pixel Resolution (mm/pixel): 1.1 Vehicles  PAUL  Benthic  Stills-Camera Infrastructure What’s my job?   • Light modelling Payload development Payload development • Light modelling • Mechanical payload design Payload development PCC-V2 • Light modelling • Mechanical payload design • Electrical payload design  Task 2.4   Payload development Task 2.4   Payload development Task 2.4   Payload development L. Frommhold Launch and Recovery Design Launch and Recovery Design   Sensor implementation Infrastructure development Expeditions Topics which benefit from the use of AUVs Deep-Sea Ecology and Technology: • Physical-biological coupling at the Ice edge • Ecology at frontal systems   • Sub-mesoscale processes in and below the euphotic zone • Stratification near the surface   • Foto-mosaicing (distribution of species, garbage, etc.)  Physical Oceanography: • Mixing processes in the marginal Ice zone   • Mixing processes in the Denmark Strait  • Processes under shelf ice of Filchner-Ronne ice shelf      • Physic at frontal systems  • Polar front in the Fram -Strait      Sea Ice-physics: • Ice thickness observations  • Light observations under the Ice  • Under Ice topography   • Ice formation processes Marine Geochemistry: • Methane and CO2 seeps (off Svalbard, in the North and Baltic Sea)  Marine Geology  • Bathymetry below Antarctic shelf Ice • Assistance during drilling work T. Wulff Expeditions PS 121 (Benthic Payload) Dives:      5 Distance covered:    116.2 km Max. depth:      2444 m Longest unattended dive:    8:26 h / 47.7 km  Photos:       40354 Sonar:       38.9 km Collisions:     1   Expeditions Expeditions Expeditions Expeditions Expeditions Expeditions  Challenges Expeditions  Challenges T. Wulff @ PS121 Ziele: breiteres Anwendungsspektrum, benthische Einsätze, 2. Nutzlatsektion im Container Expeditions  Scientific Outcome A. Purser Ziele: breiteres Anwendungsspektrum, benthische Einsätze, 2. Nutzlatsektion im Container Expeditions  Scientific Outcome A. Purser Achievements / Scientific Highlights  200 individuals / 8 soccer fields  =  3500 individuals / kilometer²  Expeditions  Scientific Outcome 110 m Water Depth:   1500 m Time to descend:  31 min Error:    110 m Expeditions  Data correction 110 m Thank you! C. Rohleder @ PS121 

AUV-Team: Engineering at Alfred-Wegener-Institute

https://epic.awi.de/id/eprint/50939/1/Presentation_AUV-Team_Engineering_at_AWI.pdf

AUV-Team: Engineering at Alfred-Wegener-Institute

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