The Benguela Current is a large, northward-flowing ocean current that makes up the eastern part of the South Atlantic Ocean gyre. The current stretch about from Cape Point in the south to the Angola-Benguela border in the north. The prevailing south easterly trade winds propel the stream. The Benguela Upwelling System is formed when south-easterly winds induce coastal upwelling inshore of the Benguela Current proper. This article will explain to you about the Benguela Currents which will be helpful in Geography preparation for the UPSC Civil service exam.

Benguela Current

• The Southern Equatorial Current merges with Angola. It was named after the Portuguese-established Angolan port of Benguela, which was created in 1617.
• European seamen were first to discover the current, which made it difficult for them to navigate the region at first.
• With the expansion of Antarctic ice sheets and changes in world circulation induced by tectonic events such as the emergence of the Panama Isthmus and the rising of the Himalayas and Tibetan Plateau, the Benguela Current emerged some 11 million years ago.
• Around 4-3 million years ago, the upwelling system was fully formed, imposing the atmospheric conditions that gave rise to the Namib Desert, the Karoo desert shrublands, and the Succulent Karoo Ecosystem.

Benguela Current - Physical Features

• The Benguela Current is an oceanic current that is a branch of the Southern Hemisphere's West Wind Drift.
• It flows northward along the west coast of southern Africa nearly to the Equator in the South Atlantic Ocean before combining with the westward-flowing Atlantic South Equatorial Current.
• The Benguela Current, which flows along the coasts of South Africa, Namibia, and Angola, is the eastern limit of a vast gyre in the South Atlantic Ocean.
• As they meet off the South African capes, the current mix water from the Atlantic and Indian Oceans.
• This part of the Atlantic experiences ocean upwelling as a result of this current and the prevailing southeasterly winds.
• The current stretches roughly from Cape Point in the south to the Arctic Circle in the north.

Benguela Current - Biological Features

• The waters off the coast of southwestern Africa are among the world's most ecologically prolific and chemically fascinating.
• Warm surface waters are pushed away from the coast, allowing cooler, nutrient-rich water to emerge from the seabed.
• The colder water along the arid coast of southwest Africa also helps to keep air temperatures down.
• The ocean is teeming with life, from plankton to fish to whales, thanks to the dynamic wind and water motion. It all starts with phytoplankton, which is a type of floating plant-like microbe that is the primary food supply for marine ecosystems.
• To feed huge blooms, phytoplankton locates a near-perfect blend of nutrients, water temperatures, and sunlight.
• They frequently appear to satellites as an abundance of chlorophyll, the green pigment that aids in the conversion of sunlight into energy.
• A rich sea life exists beneath the surface where the chilly Benguela meets the warm, south- and west-flowing Agulhas, but there is enormous turbulence above.
• The Cape of Good Hope is said to be the meeting point of two oceans, the cold Benguela (Atlantic Ocean) and the warm Agulhas (Indian Ocean)
• However, for many hundred miles east and west of the Cape, the currents converge.

Benguela Nino

• A thick slab of warm, nutrient-poor water, akin to the Pacific El Nino, hits the northern section of the Benguela upwelling system off the Namibia coast once per decade.
• Due to an El Nino influence, the temperature of the water has risen as far south as 25 degrees S, but it has also gotten more saline.
• Warm, salty waters from the Angola Current travel southward between 15°S and 25°S during the Benguela Nino.
• This swath of warm, salty water stretches 150 kilometers (93 miles) offshore and down to a depth of 50 meters (164 feet).
• There have been reports of heavy rainfall, fluctuations in fish abundance, and proximity to the Pacific El Nino.
• The Benguela Nino is created by winds in the west-central equatorial Atlantic Ocean that propagate as subsurface water temperature anomalies to the African coast, according to one research team.
• Local winds have an important role in the growth of the Benguela Nio off the coasts of Namibia and Angola, according to recent research.
• This local activity, in combination with the remote signal from the equatorial regions, forms the foundation of the formation mechanism, in which both processes occasionally strengthen one other.
• The difficulty that the Benguela Current is facing as a result of global warming and climate change is a rise in the temperature of ocean water, which has led to a rise in the temperature of the Benguela Current's waters.
• Anomaly air conditions have been seen in the western tropical Atlantic Ocean, which could be the cause of this development.

Benguela Current - Significance

• The Benguela is the southern Atlantic's lifeblood and an important economic resource for South Africa, Namibia, and Angola.
• The Benguela Current supports an important global reservoir of biodiversity and biomass of zooplankton, fish, sea birds, and marine mammals.
• With nearshore and offshore sediments holding rich deposits of precious minerals (particularly diamonds), as well as oil and gas reserves, with fishing being roughly six times more productive than the North Sea.
• The Benguela Current is one of the world's 64 Large Marine Ecosystems (LMEs) (the Sulu-Sulawesi Sea in the Coral Triangle is another).
• Coastal waters from river basins and estuaries to the seaward edge of continental shelves and the outer margins of coastal currents are included in these natural zones.
• They are relatively vast regions of 200,000 square kilometers or more, characterized by their bathymetry (undersea topography), hydrography (depth and composition of the seabed), fisheries productivity, and natural food chain make-up.
• These habitats are responsible for 80 percent of global marine fisheries catch.

Conclusion

The Benguela Current also contributes to the global ocean and climate systems by transferring heat from the Southern to the Northern Hemisphere. The upwelling area exerts high aridity over the nearby continental areas in a regional context. The Benguela Current serves as a worldwide biodiversity and biomass hotspot for zooplankton, fish, seabirds, and marine mammals.

FAQs

MCQs

1. What is the primary direction of flow for the Benguela Current?

A) Southward
B) Northward
C) Westward
D) Eastward

2. Which of the following is a significant consequence of the Benguela Current for the region?

A) Increased rainfall
B) Rich fisheries and marine life
C) Formation of tropical cyclones
D) Warming of ocean temperatures

3. Which of the following is true about the Benguela Current?

A) It is part of the Indian Ocean gyre.
B) It flows southward along the western coast of Africa.
C) It is part of the South Atlantic subtropical gyre.
D) It flows in the direction of the Gulf Stream.

4. How does the Benguela Current contribute to the local climate?

A) By warming the coastal waters
B) By cooling the coastal waters
C) By increasing precipitation
D) By decreasing coastal wind speed

5. Which of the following factors is most affected by the Benguela Current?

A) Wind patterns
B) Ocean temperature
C) Sea level rise
D) Earth’s tilt

GS Mains Questions and Model Answers

Q1: Evaluate the significance of the Benguela Current in shaping the climate and economy of Southern Africa. How does it contribute to marine biodiversity?

Answer: The Benguela Current is one of the key oceanic currents affecting the climate and economy of Southern Africa. By bringing cold, nutrient-rich waters from the Southern Ocean, it supports one of the world's most productive marine ecosystems. This current contributes to high fish stocks, vital for the economies of Namibia, Angola, and South Africa. It also shapes the regional climate by cooling the coastal waters, resulting in cooler and drier conditions. The economic impact is significant, as the fishing industry thrives due to the abundant marine life supported by the current.

Q2: Discuss the role of the Benguela Current in the context of global climate patterns and ocean circulation systems. How does it affect the thermohaline circulation?

Answer: The Benguela Current is a critical component of the South Atlantic subtropical gyre, contributing to the global thermohaline circulation. The current helps regulate the distribution of heat in the Atlantic Ocean, influencing weather patterns across the hemisphere. As part of the larger ocean circulation system, the Benguela Current plays a role in the movement of cold and warm waters, impacting climate systems globally. Changes in the current due to climate change could have cascading effects on the broader thermohaline circulation and global climate patterns.

Q3: Analyze the potential impacts of climate change on the Benguela Current. What could be the consequences for marine ecosystems and the economies dependent on them?

Answer: Climate change poses significant risks to the Benguela Current. Warming temperatures could disrupt the upwelling of nutrient-rich waters, reducing marine productivity and affecting fish populations. As the ecosystem becomes less productive, the fishing industries of Namibia, Angola, and South Africa would suffer , leading to economic losses and potential social instability. Additionally, changes in the current’s flow could impact regional weather patterns, exacerbating existing challenges like droughts and reduced agricultural output.

Previous Year Questions on Benguela Currents

1. UPSC CSE Prelims 2019:

Question: The Benguela Current is associated with which of the following regions?

A) Mediterranean Sea
B) Western coast of Southern Africa
C) Eastern coast of India
D) Gulf of Mexico

Answer: (B)

Explanation: The Benguela Current flows along the western coast of Southern Africa, impacting the countries of Namibia, Angola, and South Africa.

2. UPSC CSE Mains 2020 (GS Paper 1):

Question: "The Benguela Current plays a vital role in the climate and economy of Southern Africa." Discuss the significance of this oceanic current, with a focus on its environmental and economic impacts.

Answer: The Benguela Current, by bringing cold, nutrient-rich waters to the coast, supports a high marine biodiversity, which in turn sustains the fisheries vital to the economies of Namibia, Angola, and South Africa. The current also regulates the local climate by cooling the coastal areas, contributing to arid conditions. These factors make the current central to both environmental stability and economic prosperity in the region.