Facts about the Southern Ocean
- 10
Leopard seals in the Southern Ocean consume approximately 450,000 tons of krill annually, making them one of the region's apex predators despite comprising only a fraction of the marine mammal biomass.
- 09
Approximately 90 percent of the world's ice exists in Antarctica, with the Southern Ocean surrounding it containing dissolved oxygen levels 25 percent higher than tropical oceans due to cold water's greater gas solubility.
- 08
In 2002, the Larsen B Ice Shelf collapsed in the Southern Ocean, releasing an area of ice larger than Rhode Island into the sea within just 35 days.
- 07
Adelie penguin populations in the Southern Ocean have declined by approximately 70 percent since the 1970s due to warming waters reducing sea ice habitat and food availability.
- 06
At 60 degrees south latitude, the Antarctic Convergence creates a natural boundary where Southern Ocean waters sink 1,000 meters below warmer northern waters, isolating Antarctic ecosystems.
- 05
Every 1,000 years, the Southern Ocean's deep waters complete one full circulation cycle, playing a critical role in regulating Earth's climate by storing carbon dioxide for centuries.
- 04
Krill populations in the Southern Ocean comprise approximately 500 million tons of biomass, making them Earth's most abundant animal species by mass.
- 03
Winds around Antarctica exceed 40 knots on average, making the Southern Ocean the planet's windiest marine region and a crucial driver of global ocean circulation.
- 02
Temperatures in the Southern Ocean have risen 0.13 degrees Celsius per decade since 1901, warming faster than most ocean basins globally.
- 01
Roughly 70 percent of Earth's oxygen originates from phytoplankton in the Southern Ocean, making it one of the planet's most vital ecosystems.