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Scientists plumb 10,000m below the waves

Author
NZ Herald,
Publish Date
Mon, 18 Dec 2017, 12:19PM
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Scientists plumb 10,000m below the waves

Author
NZ Herald,
Publish Date
Mon, 18 Dec 2017, 12:19PM

Scientists have probed the depths of the Kermadec Trench - plunging more than 45 times the length of Auckland's Sky Tower - to retrieve what's believed to be the deepest ever ocean sediment sample collected by a special coring instrument.

The sample was obtained a week ago at 9994m deep using a wire-deployed corer, in a mission that took six hours to complete.

The three-week voyage to the Kermadec Trench aboard Niwa's flagship research vessel Tangaroa, returned to Wellington yesterday after gaining new insight into the function of one of the deepest trenches in the world.

The trench is 1500km long and comprises a series of deep basins that are more than 9000m beneath the sea surface.

The deepest basin, Scholl Deep, is almost 10km deep and was discovered by a Danish research expedition in 1952.

During this voyage, a combined Niwa and University of Southern Denmark expedition, scientists used a range of sophisticated autonomous deep-diving vehicles as well as traditional sampling approaches.

Professor Ronnie Glud, from the University of Southern Denmark, said the work carried out on this voyage confirmed recent research suggesting that the deepest trenches act as hotspots of intensified biological activity in the oceans.

Crew onboard Niwa research vessel Tangaroa lower the corer into the Kermadec Trench. Photo / Niwa

Crew onboard Niwa research vessel Tangaroa lower the corer into the Kermadec Trench. Photo / Niwa

"We found that the greatest depths in the Kermadec Trench hosted intensified biological activity, but what was more surprising was the high degree of variability in the metabolic activity among the basins along the trench axis."

He said that these findings showed that the deep trenches were far more diverse than originally believed.

"If we are to understand the biological and biogeochemical function of the great trenches and their importance for regeneration and sequestration of nutrients and organic carbon in the global ocean, it is of great importance to acknowledge this diversity," Glud said.

Months of work now face the team analysing and interpreting the many data and samples collected on the voyage.

Scientists will identify the microbial and faunal communities and seek to explain the variation in the organic carbon processing that was observed among the different trench basins.

The deep trenches host unknown and unique life forms that are adapted to extreme pressure.

Niwa marine ecologist Dr Ashley Rowden, who co-led the voyage, says the samples and data will help the team to understand how life at such conditions functions and differs from those at shallower depth.

"The deep trenches remain under-studied and represent some of the few spots left to on the globe to be explored," he said.

Scientists used a range of sophisticated autonomous deep-diving vehicles as well as traditional sampling approaches. Photo / Niwa

Scientists used a range of sophisticated autonomous deep-diving vehicles as well as traditional sampling approaches. Photo / Niwa

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