IMOS - Deep Water Moorings - Southern Ocean Time Series (SOTS) Sub-Facility, Pulse 5 Mooring Platform (Oct 2008 to Apr 2009)

• Other Authors: AODN Data Manager (distributor), Bray, Stephen (pointOfContact), CSIRO Oceans & Atmosphere - Aspendale (hasAssociationWith), CSIRO Oceans & Atmosphere - Hobart (hasAssociationWith), CSIRO Oceans & Atmosphere - IOMRC Crawley (hasAssociationWith), CSIRO Oceans & Atmosphere - St. Lucia (hasAssociationWith), Data Officer (distributor), Integrated Marine Observing System (IMOS) (resourceProvider), Shadwick, Elizabeth (pointOfContact)
• Format: Dataset
• Language: unknown
• Published: Australian Ocean Data Network
• Subjects: oceans; OCEAN CURRENTS; EARTH SCIENCE; OCEAN CIRCULATION; OCEAN WAVES; OCEAN HEAT BUDGET; OCEAN WINDS; OCEAN TEMPERATURE; MARINE BIOLOGY; EARTH SCIENCE SERVICES; ENVIRONMENTAL ADVISORIES; MARINE ADVISORIES; OCEAN CHEMISTRY; Solid Earth | Geochemistry | Biogeochemistry; IMOS Facility | Deep Water Moorings; IMOS Platform | PULSE5H | Pulse 5'heavy' Mooring; IMOS Platform | PULSE5L | Pulse 5'light' Mooring; Global / Oceans | Southern Ocean; acceleration; tension; voltage; aurora australis; Southern Ocean
• Online Access: https://researchdata.edu.au/imos-deep-water-apr-2009/697785

Maintenance and Update Frequency: daily Statement: A Pulse mooring, a component of the Southern Ocean Times Series IMOS Facility 3., was deployed from Aurora Australis in late December 2007. Following the loss of the fully instrumented mooring in January 2007 this version marks a return to a minimally instrumented mooring for the purpose of further engineering testing. For this reason, and to meet shiptime constraints the mooring was deployed along the WOCE/CLIVAR SR3 line south of Tasmania in ~3500m of water. The surface buoy transmits its GPS position, which varies with wind and currents, as shown in Figure 1. The mooring (was?) recovered from Southern Surveyor in early April 2008, inspected for wear and damage, and prepared for a more completely instrumented deployment in spring 2008. Statement: Pulse Light and Heavy will telemeter back engineering data about mooring tension, acceleration and battery voltage. An independent system transmits GPS position. The main difference between Pulse Light and Pulse Heavy is that Pulse Heavy has an extra 450 m of wire and a water filled damper at bottom of top section. To make up for this Pulse Light has a taller bottom section. The water damper on Pulse Heavy adds inertial mass to the lower part of the top section, and because of the rubber elements higher up this mass helps to further isolate the instrument package from accelerations due to wave action on the surface float. The other benefit of having the the extra weight in the bottom of the top section is that it keeps the mooring more upright. As you can see by the figures below Pulse Light runs the risk of being completely stretched out due to current. If a wave slams surface float in when the mooring is stretched out completely the rubber elements could fail. Pulse light's advantages are; less drag (as it has a smaller subsurface profile), and less stress on the rubber element due to not having that inertial mass. Credit Australia’s Integrated Marine Observing System (IMOS) is enabled by the National ...