Tuesday, March 20, 2012


The multicorer is used to examine a small amount of the surface sediments. Up to eight tubes are lowered down to the sea bed and pushed into the soft sediment.

 As they are pulled back up, these tubes are sealed at either end so that a small plug of undisturbed mud is hauled up to the ship- can you see the tubes with sediment in them below?

Valley of Death- Chatham Rise Sediment

Southern Ocean Sediment
The sediment was different colours and texture at the different locations. Above is an example of Southern Ocean sediment which was quite pale. The Valley of Death is an area just south of the Chatham Rise. This area may have a methane gas issue as nothing grows here (hence Scott Nodder giving it this name!) This had a darker colour. On the Rise itself, the multicorer was sent over twice as it hit a rather harder surface. In the Northern area, the sediment had a definate muddier colour and was more clay-like in appearance.

Once back on board, the tubes were scooped, sliced and diced for a load of things such as sediment characteristics, bacterial analysis and sieving out the animals that live in various horizontal sections.
Marine Worm from the Chatham Rise- put in a jar with a water proof label saying where and when. (Lid labelled as well)

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