For years, children worldwide have grown up memorizing the basic facts: there are seven continents and four oceans: Atlantic, Pacific, Indian, and Arctic oceans. Until now. On June 8, 2021, the National Geographic Society published their article recognizing the Southern Ocean surrounding Antarctica as the fifth world ocean (Gibbens, 2021).
What’s in a Name?
Changes to world maps are usually made due to political agreements and modifications. For example, Czechoslovakia split into the Czech Republic and Slovakia, Swaziland voted to change its name to Eswatini. The Republic of Macedonia changed its name to the Republic of North Macedonia. These changes have political significance, in most cases for foreign policy purposes.
National Geographic geographer Alex Tait explained why naming conventions are essential: “Part of mapping the world is using place names and features that are in common use among people who are describing the world, and this gets into some other things other than geopolitical naming” (Gibbens, 2021). Tait highlights that despite National Geographic’s prominence in the mapping world, giving its official decree more weight, others have started to use the term “Southern Ocean”.
Limits of the Southern Ocean
While this recognition leaves a notable impression on geographers around the world, the Southern Ocean’s classification as an independent ocean has been contested amongst researchers for centuries. The debate stems from the connectivity of the Southern Ocean with the Atlantic, Pacific, and Indian Oceans. The existing world oceans are characterized by their boundaries, which are established by continents. As there are no landforms to define the boundary of the Southern Ocean, it was thought to be an extension of these waters. While there are no physical boundaries defining the Southern Ocean, Antarctica is surrounded by the Antarctic Circumpolar Current (ACC); the world’s strongest ocean current (Flowers, 2021).
The ACC was formed approximately 34 million years ago when Antarctica split from South America (Gibbens, 2021). The current flows from west to east around Antarctica in a broad fluctuating band that roughly follows 60 degrees latitude south. According to an article written by Jennifer Flowers for AFAR, the ACC plays an important role in exchanging nutrients and regulating ocean temperatures. The Southern Ocean is distinct ecosystem as the ACC keeps the ocean waters at temperatures ranging from -2 to 10 degrees Celsius. This provides habitat to unique wildlife that cannot be found anywhere on the planet.
“New” World Ocean
Although this ocean, until recently, has not had an official name, it isn’t entirely new. Back in 2000, experts proposed boundaries for the Southern Ocean, but all the countries making up the International Hydrographic Organization (IHO) could not come to a unanimous decision on how the Southern Ocean would be distinguished. To this day, the Southern Ocean is still not recognized by the IHO, but it is anticipated that this move by National Geographic will pave the way for international recognition.
The National Geographic Society’s map policy committee had been considering making this important change for years. The change aligns with the Society’s initiative to conserve the world’s oceans, focusing public awareness on a region in particular need of a conservation spotlight. Alex Tait states “we’ve always labeled it, but we labeled it slightly different [than other oceans]” (Gibbens, 2021).
The National Geographic Society hopes that by drawing attention to the Southern Ocean, they can raise awareness and promote the conservation of this critical system.
Sources:
Flowers, J. (2021, August 26). Introducing the world’s newest ocean. AFAR Magazine. https://www.afar.com/magazine/the-southern-ocean-was-just-named-earths-fifth-heres-why
Gibbens, S. (2021, June 8). There’s a new ocean now—can you name all 5?. National Geographic. https://www.nationalgeographic.com/environment/article/theres-a-new-ocean-now-can-you-name-all-five-southern-ocean