Summit County Citizens Voice

One of the newly discovered vents in the Southern Ocean.

Studies help understand ocean chemistry and evolution of marine life

By Summit Voice

SUMMIT COUNTY — The latest discovery of a set of deep-sea volcanic vents in the chilly waters of the Southern Ocean suggests that the vents may be more common in the oceans than previously thought.

Scientists aboard the Royal Research Ship James Cook discovered the vents will exploring a newly discovered seafloor crater close to the South Sandwich Islands, about 500 kilometers southeast of South Georgia.

The discovery is the fourth made by the research team in three years, which suggests that deep-sea vents may be more common in our oceans than previously thought.

“When we caught the first glimpse of the vents, the excitement was almost overwhelming,” says Leigh Marsh, a University of Southampton PhD student who was on scientific watch at the time of the discovery.

Using an underwater camera system, the researchers saw slender mineral spires three metres tall, with shimmering hot water gushing from their peaks, and gossamer-like white mats of bacteria coating their sides. The vents are at a depth of 520 metres in a newly-discovered seafloor crater close to the South Sandwich Islands, a remote group of islands around 500 kilometres south-east of South Georgia.

Deep-sea vents are hot springs on the seafloor, where mineral-rich water nourishes lush colonies of microbes and deep-sea animals.  In the three decades since scientists first encountered vents in the Pacific, around 250 have been discovered worldwide.  Most have been found on a chain of undersea volcanoes called the mid-ocean ridge, however, and very few are known in the Antarctic.

“We’re finding deep-sea vents more rapidly than ever before,” says expedition leader Professor Paul Tyler of the University of Southampton’s School of Ocean and Earth Science, which is based at the National Oceanography Centre, Southampton. “And we’re finding some in places other than at mid-ocean ridges, where most have been seen before.”

New undersea vents have been discovered in this remote part of the Southern Ocean.

By studying the new vents, the team hope to understand more about the distribution and evolution of life in the deep ocean, the role that deep-sea vents play in controlling the chemistry of the oceans, and the diversity of microbes that thrive in different conditions beneath the waves.

The researchers were exploring ‘Adventure Caldera’, a crater-like hole in the seafloor three kilometres across and 750 metres deep at its deepest point.  Despite its size, Adventure Caldera was only discovered last year by geophysicists from the British Antarctic Survey.

The new vents are the fourth set to be discovered around Antarctica in three expeditions since 2009.  Their discovery is part of a project funded by the UK Natural Environment Research Council (NERC), which involves researchers from the National Oceanography Centre in Southampton, the British Antarctic Survey in Cambridge, the Universities of Southampton, Newcastle, Oxford, Bristol and Leeds, and Woods Hole Oceanographic Institution in the US.

Filed under: biodiversity, Environment, Marine biology Tagged: | British Antarctic Survey, deepsea volcanic vents, Hydrothermal vent, National Oceanography Centre Southampton, South Georgia and South Sandwich Islands, Southern Ocean, Summit County News, Woods Hole Oceanographic Institution