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Drake Passage

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The Drake Passage is a vital body of water located in the extreme southern latitudes.

Drake passage en
Drake passage en

It sits between Cape Horn in Chile and the South Shetland Islands of Antarctica. This passage serves as a critical link between the Atlantic and Pacific Oceans. Specifically, it connects the southwestern Atlantic, known as the Scotia Sea, with the southeastern Pacific.

Drake Passage - Orthographic projection
Drake Passage - Orthographic projection

Because it is the narrowest point around the Antarctic continent, it acts as a choke point for global water movement.

The passage is defined by the powerful Antarctic Circumpolar Current, or ACC. This is the strongest oceanic current on Earth.

Flow from the Antarctic Circumpolar Current to the other ocean basins
Flow from the Antarctic Circumpolar Current to the other ocean basins

Because no landmasses block its path, the current flows unimpeded around the globe. This lack of resistance causes the seas to meet with immense power. Waves in the passage can reach heights of 40 feet or 12 meters.

Drake2
Drake2

This makes traversing the passage one of the most treacherous voyages for any ship.

Geologically, the Drake Passage was created by plate tectonics. This process separated Antarctica from South America. Scientists debate the exact timing of this event. Estimates suggest it occurred between 17 and 49 million years ago. The Shackleton fracture zone lies beneath the seafloor of the passage.

Drake-Passage profile hg
Drake-Passage profile hg

This separation had a massive impact on the planet. It allowed the ACC to form and encircle Antarctica. This isolation likely caused the rapid expansion of Antarctic ice sheets. It also helped trigger global cooling during the Eocene epoch.

History shows many different names for this stretch of water. In 1525, the Spanish navigator Francisco de Hoces likely discovered it. He was blown south away from the Strait of Magellan. Spanish sources often call it the Mar de Hoces. The passage is also known as Pasaje de Drake or Paso Drake in Spanish-speaking regions. It received its English name from Sir Francis Drake. In 1578, Drake sailed his flagship, the Golden Hind, through the area.

DrakeP1
DrakeP1

He was blown far south by a tempest during his circumnavigation. Later, in 1616, Willem Schouten became the first to sail around Cape Horn. In 2019, a crew of six explorers made history by rowing across the passage.

The Drake Passage is essential to physical oceanography. It allows the Atlantic, Pacific, and Southern Oceans to connect. This exchange is the only large-scale connection between the global oceans. The passage is about 800 kilometers or 500 miles wide.

Drake Passage - Lambert Azimuthal projection
Drake Passage - Lambert Azimuthal projection

The International Hydrographic Organization defines the boundary between the oceans using the meridian at Cape Horn. The width and depth of the passage, known as its bathymetry, influence global climate. Scientists study how this shape affects the movement of water and heat.

The passage drives a global system called the thermohaline circulation. This is often described as a giant oceanic conveyor belt.

Thermohaline circulation
Thermohaline circulation

The ACC moves massive amounts of water, estimated at 100 to 150 Sverdrups. A Sverdrup is a unit representing one million cubic meters of water per second. Through a process called Ekman Transport, some of this water moves toward the equator. About 23 Sverdrups of water travel from the passage into the Atlantic and Pacific. This movement helps maintain the global mass balance and ocean circulation. Without an open passage, the North Atlantic Deep Water cell would not exist.

Deep-sea features in the passage also cause important mixing. This is known as diapycnal mixing, where different layers of water blend together.

DensityDrivenCirculation
DensityDrivenCirculation

This mixing is driven by internal waves breaking against underwater obstacles. When these waves break, they release energy and move water vertically. The diapycnal diffusivity in the Drake Passage is 20 times higher than in the Pacific sector. This mixing is necessary for density-driven circulation to function. Without it, cooler water would never rise above warmer water. This process is a key part of how the global ocean stays in motion.

Despite the harsh conditions, the passage is full of life. Many species of whales and dolphins live in these waters.

You might see humpback whales or other large cetaceans.

Drake5
Drake5

The area is also home to many seabirds. These include giant petrels, albatrosses, and penguins.

Drake4
Drake4

Scientists continue to monitor the passage using satellites and research ships. They study the strength of the ACC and the movement of cold-core rings. The Drake Passage remains a vital laboratory for understanding our changing world.

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🖼️ Images & Media (15)
File:Thermohaline circulation.svg
Thermohaline circulation.svg
File:DensityDrivenCirculation.jpg
DensityDrivenCirculation.jpg
File:Flow from the Antarctic Circumpolar Current to the other ocean basins.jpg
Flow from the Antarctic Circumpolar...
File:Experiments opening drake passage.jpg
Experiments opening drake passage.jpg
File:Waves in pacifica 1.jpg
Waves in pacifica 1.jpg
File:Hourglas dolphin crop.jpg
Hourglas dolphin crop.jpg
File:Drake-Passage profile hg.png
Drake-Passage profile hg.png
File:Drake2.JPG
Drake2.JPG
File:Drake3.JPG
Drake3.JPG
File:Drake4.JPG
Drake4.JPG
File:DrakeP1.JPG
DrakeP1.JPG
File:Drake5.JPG
Drake5.JPG

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