Drake Passage

Drake Passage
GMT (OMC) base map modified by Giovanni Fattori · CC BY-SA 3.0 · source
Name	Drake Passage
Caption	The often turbulent waters of the passage.
Location	Between South America and the Antarctic Peninsula
Type	Strait
Max-width	~800 km (500 mi)
Min-width	~650 km (400 mi)
Average depth	~3,400 m (11,000 ft)
Max-depth	~4,800 m (15,700 ft)
Islands	Diego Ramírez Islands, South Shetland Islands
Frozen	Rarely, due to strong currents

Drake Passage. It is the body of water between the southern tip of South America at Cape Horn and the northern tip of the Antarctic Peninsula. This deep-water conduit connects the southeastern Pacific Ocean with the southwestern Atlantic Ocean and forms the shortest crossing from any continent to the Antarctic mainland. Renowned for its notoriously rough seas and powerful winds, it is a critical gateway for scientific research and maritime transit to the Southern Ocean.

Geography and location

The passage spans approximately 800 kilometers between Cape Horn in Chile and the South Shetland Islands near Antarctica. To the north lies the Strait of Magellan and the Falkland Islands, while its southern boundary merges with the Scotia Sea. Key landmarks within the passage include the small, rocky Diego Ramírez Islands, which are the southernmost point of South America. The seafloor topography is dominated by the deep and narrow Scotia Ridge, which arcs eastward from the passage towards South Georgia and the South Sandwich Islands. This underwater ridge influences the path of the powerful Antarctic Circumpolar Current that flows through the region.

Oceanography and climate

The region is dominated by the unimpeded flow of the Antarctic Circumpolar Current, the world's most voluminous ocean current, which transports vast amounts of water eastward. This current, combined with the absence of any significant landmass, allows the relentless Westerlies to generate enormous waves, frequently exceeding 10 meters, and sustained winds often reaching storm force. The convergence of the cold, northward-flowing Antarctic Coastal Current with slightly warmer subantarctic waters creates the Antarctic Convergence, a sharp biological and physical front. Water temperatures remain near freezing year-round, and the passage is notably ice-free due to the turbulent conditions that prevent extensive sea ice formation.

History and exploration

The passage is named for the English privateer Sir Francis Drake, though his ship, the Golden Hind, likely only sailed near its northern approaches in 1578. The first recorded complete crossing was accomplished by the Dutch mariner Willem Schouten aboard the Eendracht in 1616, after he rounded Cape Horn. For centuries, it was a feared part of the clipper route used by sailing ships traveling between Europe and Australasia. The heroic age of Antarctic exploration saw numerous expeditions traverse its waters, including those led by James Cook, Ernest Shackleton, and Robert Falcon Scott. The development of stronger vessels and modern navigation eventually made transit more routine, particularly for research vessels bound for stations like McMurdo Station.

Ecology and marine life

The nutrient-rich, oxygenated waters support a highly productive ecosystem. The passage is a vital feeding ground for numerous cetacean species, including fin whales, humpback whales, and various species of dolphin. Large populations of penguins, such as chinstrap and gentoo, breed on the surrounding islands and feed in its currents. The area is also critical for seabirds like the wandering albatross and black-browed albatross, which glide on the strong winds. Key fisheries in the region have historically targeted species like the Antarctic krill, a cornerstone of the Southern Ocean food web that supports baleen whales, seals, and squid.

Navigation and significance

It remains one of the most challenging maritime routes in the world, requiring vessels to be specially strengthened for ice and heavy seas, a classification known as ice class. The passage is the primary maritime access route for supplying Antarctic research stations operated by nations like the United States, the United Kingdom, and Argentina. It holds significant strategic and scientific importance, serving as a key corridor for oceanographic studies on climate change, current dynamics, and carbon sequestration. The International Association of Antarctica Tour Operators oversees a growing number of tourist expeditions that cross the passage, while its legal status is governed by the provisions of the Antarctic Treaty System.

Category:Straits of the Southern Ocean Category:Straits of Chile Category:Straits of Antarctica