Mercury (Hobart)

Gliders key to ice-melt riddle

Radical new technology offering Antarctic insight

- Tia Ewen

Two barnacle-covered gliders battling the world’s strongest current while investigat­ing causes behind ice melt in Antarctica have been retrieved by the team on board the CSIRO research vessel Investigat­or.

And data uncovered has never been seen by scientists before.

The gliders were deployed last November, with scientists using the technology in combinatio­n with groundbrea­king satellite technology Surface Water and Ocean Topography (SWOT), to investigat­e eddies believed to be a gateway for warm water leaking south.

“We were jumping up and down when they finally picked the gliders up, because it’s been a long time,” CSIRO glider pilot Dr Bea Pena-Molino said.

The gliders have been in the Southern Ocean for more than four months and travelled 3600km since being deployed until their retrieval this week.

“The data they produce, it’s really amazing. We’ve got to see things in the ocean that we hadn’t seen before,” Dr PenaMolino said.

“The most exciting part for us is this combinatio­n with a new satellite technology.

“Some of the features that we’ve seen would have been invisible to us with traditiona­l tools but with SWOT and the gliders, it’s zoomed into something that we haven’t seen before.”

CSIRO has collaborat­ed with a team in the US to pilot the two gliders 24 hours a day.

“When we took the ship out to deploy the glider, the ship can only be in one place at one time, and having little tools like these means that all of a sudden we can multiply that presence in the ocean,” Dr PenaMolino said.

“Having that broader view is something that this project has really benefited from.”

While it’s too early to have definitive results from extracting the data, Dr Pena-Molino said she expects to have some results by the end of the year.

“We’re really excited about trying to put the data and science in the bigger context and understand­ing what it means for the Southern Ocean as a whole,” she said.

“We’re now querying our models and asking if the models we use for climate capture the same physics? Are they right? When we go to these much finer details, do we get the same answer?”

On the same voyage last November, the team on board the Investigat­or also discovered underwater volcanoes for the first time, while mapping the Antarctic Circumpola­r Current.

 ?? ?? A glider, covered in barnacles, retrieved after investigat­ing the Antarctic Circumpola­r Current. Picture: CSIRO
A glider, covered in barnacles, retrieved after investigat­ing the Antarctic Circumpola­r Current. Picture: CSIRO
 ?? ?? CSIRO glider pilot Dr Bea PenaMolino.
CSIRO glider pilot Dr Bea PenaMolino.

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