Seals take scientists to Antarctic’s ocean floor

SYDNEY - Reuters

A Southern Ocean elephant seal wears a sensor on its head as it sleeps. REUTERS photo

Elephant seals wearing head sensors and swimming deep beneath Antarctic ice have helped scientists better understand how the ocean’s coldest, deepest waters are formed, providing vital clues to understanding its role in the world’s climate.

The tagged seals, along with sophisticated satellite data and moorings in ocean canyons, all played a role in providing data from the extreme Antarctic environment, where observations are very rare and ships could not go, said researchers at the Antarctic Climate & Ecosystem CRC in Tasmania.

Scientists have long known of the existence of “Antarctic bottom water,” a dense, deep layer of water near the ocean floor that has a significant impact on the movement of the world’s oceans.

Three areas where this water is formed were known of, and the existence of a fourth suspected for decades, but the area was far too inaccessible, until now, thanks to the seals.

“The seals went to an area of the coastline that no ship was ever going to get to,” said Guy Williams, ACE CRC Sea Ice specialist and co-author of the study. “This is a particular form of Antarctic water called Antarctic bottom water production” he said.