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The research vessel Tangaroa
The RV Tangaroa is NIWA’s main research vessel. RV Tangaroa is 70 metres long, nearly 14 m wide and has a 7 m draft - the depth of the vessel's keel below the water line. She - all ships are called she - carries a maximum of 44 people and on this voyage to the Ross Sea there are 26 science personnel and the remainder are crew. On a voyage the ship carries enough fuel and food for 60 days. There are no restrictions on fresh water as the ship produces its own – mind you with 44 on board we do have to watch usage, as lots of slow running or stopped on station means we may not produce enough water to maintain supplies.
For safety in the Antarctic environment the ship is equipped with sufficient emergency gear for all the ship’s personnel to survive on shore for several days.
We have a fully equipped hospital and for this trip carry a doctor. The deck officers are all experienced in ice operations but for added safety we carry an Ice Pilot – a deck officer with years of experience in Antarctic ice navigation. The Tangaroa has an ice rating which allows it to break through 0.3 m of year-old sea ice and push older flows out of its path but we limit our ice contact where ever possible. Regular ice coverage maps and weather forecasts are supplied to the ship to assist in our survey operations.
Read more about how multibeam echo-sounders generate GIS information to create images of the seafloor on:
http://www.esri.com/news/arcnews/fall04articles/amongst-the-icebergs.html
IPY Blogs week 1
Deck Crew
The deck crew work 24/7 in two watches, each with four men, midnight to midday and midday to midnight. As we travel to Antarctica we prepare nets and scientific equipment, lay down rubber matting to reduce the danger of slipping on ice build up. We close up vents to keep the ship warm. At night we stand watches on the bridge. From 60° south we keep 24 hour watch for icebergs (remember the Titanic). Most of the deck crew has been to Antarctica before and the ones that haven’t will soon find out just how cold it can get.
Written by Edmund Fox
Controlling the ship
The Tangaroa moves like a giant skate board 70 m long and weighing 3,000 tons. The Officer of the Watch in the navigation bridge moves a small wheel, the size of a peanut butter jar lid to turn the ship. But most times the ship follows a preprogrammed course using the automatic pilot. Pushing or pulling a lever the size of a 'biro' makes the ship stop, move forward at 15 knots, or move astern (backwards) at 8 knots. A knot is a nautical mile per hour. A nautical mile measures 1,854 meters.
Written by Andrew Leachman
See video Leaving the Wellington harbour
Through the eye of the engineer
A vessel’s needs are many and varied but the main one is to set sail and come home again safe and sound. The two engineers keep things ticking over but without the assistance of the crew working as a team this couldn’t happen. Diesel fuel keeps our engines and generators running. The engineers also have to be electricians, plumbers, welders, fitters, washing machine repairers and generally Mr Fix-it guys. The general store is usually a long way away. The challenges placed in front of the engineers keep things interesting and there are seldom dull moments.
Written by Lindsay Battersby
See video In the engine room
Vessel and sampling gear
The Tangaroa carries three other craft: 10.5 m survey boat, Pelorus and two rigid inflatables. Winches with wire lengths of up to 10 km cover all our other research tasks such as towed nets for collecting fish, sleds/dredges for bottom dwelling animals; multicorer for samples of seabed organisms; nets for sampling of plankton and living animals in the water column. On this trip we are carrying a wide range of sounders including fish finders, full ocean depth echo-sounders, and a multibeam sounder; sampling gear like CTD (Conductivity, Temperature Depth) to measure salinity, temperature and to collect water samples; and various underwater camera systems.
Written by John Mitchell
Laboratories
On board are several laboratories dedicated to running equipment and experiments. On the trawl deck on top we have: a dry lab with computers, plankton nets and underwater cameras; plankton lab; an area where animals from the seafloor are sorted, identified and preserved; sterile lab for preparing samples for bacterial work. On the factory deck we have: a wet lab where fish are measured, identified, and samples taken; the constant temperature lab for bacterial work; -30°C and -80°C freezers for sample preservation. The lowest deck below the waterline contains the ship’s computer system, and multibeam echo-sounder. But the biggest research laboratory of all is the Ross Sea.
Written by John Mitchell
