Ocean surrounding Antarctica officially named world's fifth ocean by National Geographic

While other oceans are defined by their nearby continents, the Southern Ocean is defined by its current.

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By tech2 News Staff

Seventy-one percent of Earth is covered in water, but we've only ever had four oceans. That seemed a little unfair, so the kind people at the National Geographic (Nat Geo) magazine decided to remedy it. And the world now has one more ocean! They made this announcement on World Ocean Day. So, which ocean has received this title of honour, you ask. It is none other than the Southern Ocean i.e. the ocean surrounding Antarctica.

Nat Geo stated that since it began making maps in 1915, it has recognised four oceans — the Atlantic, Pacific, Indian, and Arctic Oceans. After debating this topic for years, it finally decided that starting 8 June, it will recognise the Southern Ocean as the world’s fifth ocean.


There are five oceans in the world: Atlantic, Pacific, Indian, Arctic and the Southern Ocean. Image credit: Matthew W. Chwastyk/ Soren Walljasper, NGM Staff. Eric Knight/NASA/JPL; Green Marble

“The Southern Ocean has long been recognised by scientists, but because there was never an agreement internationally, we never officially recognised it,” says National Geographic Society Geographer Alex Tait.

The Southern Ocean was a point of controversy, as some geographers wondered if it had enough unique characteristics to warrant a name of its own or if it was a colder extension to the Pacific, Atlantic, and Indian Oceans.

Scientists have known for many years that the icy waters around Antarctica form a distinct ecological region defined by ocean currents and temperatures pic.twitter.com/AQJPKZwUNN

— National Geographic (@NatGeo) June 8, 2021

In 1999, the National Oceanic and Atmospheric Administration (NOAA) recognised the Southern Ocean as the fifth body of water. But in 2000, all members of the International Hydrographic Organisation (IHO) did not agree. The IHO ensures all seas, oceans and navigable waters are properly surveyed and charted.

Once convinced this ocean deserved its own name, Nat Geo has now decided that most of the waters surrounding Antarctica till 60 degrees south latitude (excluding the Drake Passage and the Scotia Sea) will make up the Southern Ocean.

Four oceans or five? It's #WorldOceansDay🌊 and National Geographic is making a change to recognize the Southern Ocean as a fifth official ocean in our atlases and maps! https://t.co/HSHRUAyWuE

— National Geographic (@NatGeo) June 8, 2021

“Anyone who has been there will struggle to explain what's so mesmerising about it, but they'll all agree that the glaciers are bluer, the air colder, the mountains more intimidating, and the landscapes more captivating than anywhere else you can go,” said Seth Sykora-Bodie, a marine scientist at the National Oceanic and Atmospheric Administration (NOAA) and a National Geographic Explorer.

In an interview with The Washington Post, Enric Sala, National Geographic resident explorer describes the fifth ocean as "a distinct water body characterised by the powerful Antarctic Circumpolar Current that flows eastward, perpetually chasing itself around Antarctica.”

He referred to the body as an “oceanic ring at the end of the world that connects the Pacific, Atlantic and Indian oceans.”

National Geographic is an important global source for the latest geographic knowledge, so without an official determination from IHO, we are updating our oceans list based on the science and the conventional acceptance of the Southern Ocean

— National Geographic (@NatGeo) June 8, 2021

By officially recognising the ocean, Nat Geo hopes to draw attention to this ocean in order to promote conservation efforts here.

The limits of all five oceans of the world. Image credit: Matthew W. Chwastyk and Greg Ugiansky, NG Staff
Sources: NASA/JPL; International Hydrographic Organization (IHO)

Another field this change will have an impact on is education.

Tait said, "Students learn information about the ocean world through what oceans you're studying. If you don't include the Southern Ocean, then you don't learn the specifics of it and how important it is."

Long wave home

A Nat Geo report states that while other oceans are defined by their nearby continents, the Southern Ocean is defined by its current. Called Antarctic Circumpolar Current (ACC), this current is also known as the Conveyor Belt, because it helps circulate heat around the Earth. It also helps in carbon storage as the cold water sinks to the ocean floor.

The ACC was created around 34 million years ago when Antarctica broke off from Southern America. It flows west to east around Antarctica and the waters in the south are said to be colder and less salty than those in the north.

A little history

The term "ocean" was first used as a name for a river that was thought to encircle the Earth. The Ancient Greeks named this river after the Titan Oceanus ,the son of Uranus (Sky) and Gaia (Earth). He was married to Titan Tethys, who was the goddess of the primal waters that nourished the Earth. Oceanus was the father to numerous sons (called the river gods) and numerous daughters, the Oceanids.

Tags:#five oceans #nat geo #National Geographic #ocean #southern ocean. world ocean

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