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Humboldt Current
The Humboldt Current, also called the Peru Current, is a cold, low-salinity ocean current that flows north along the western coast of South America.[1] It is an eastern boundary current flowing in the direction of the equator, and extends 500–1,000 km (310–620 mi) offshore. The Humboldt Current is named after the German naturalist Alexander von Humboldt even though it was discovered by José de Acosta 250 years before Humboldt. In 1846, von Humboldt reported measurements of the cold-water current in his book Cosmos.[1]
The current extends from southern Chile (~45th parallel south) to northern Peru (~4th parallel south) where cold, upwelled, waters intersect warm tropical waters to form the Equatorial Front.[1] Sea surface temperatures off the coast of Peru, around 5th parallel south, reach temperatures as low as 16 °C (61 °F).[2] This is highly uncharacteristic of tropical waters, as most other regions have temperatures measuring above 25 °C (77 °F). Upwelling brings nutrients to the surface, which support phytoplankton and ultimately increase biological productivity.[1]
The Humboldt Current is a highly productive ecosystem. It is the most productive eastern boundary current system.[3] It accounts for roughly 18-20% of the total worldwide marine fish catch. The species are mostly pelagic: sardines, anchovies and jack mackerel. The system's high productivity supports other important fishery resources as well as marine mammals (eared seals and cetaceans) and seabirds. Periodically, the upwelling that drives the system's productivity is disrupted by the El Niño-Southern Oscillation (ENSO) event, often with large social and economic impacts.
The Humboldt has a considerable cooling influence on the climate of Chile, Peru and Ecuador. It is also largely responsible for the aridity of the Atacama Desert in northern Chile and coastal areas of Peru and also of the aridity of southern Ecuador. Marine air is cooled by the current and thus is not conducive to generating precipitation (although clouds and fog are produced).
^ abcdMontecino, Vivian, and Carina B. Lange. "The Humboldt Current System: Ecosystem components and processes, fisheries, and sediment studies." Progress in Oceanography 83.1 (2009): 65-79. doi:10.1016/j.pocean.2009.07.041
^Chavez, Francisco P.; Bertrand, Arnaud; Guevara-Carrasco, Renato; Soler, Pierre; Csirke, Jorge; "The northern Humboldt Current System: Brief history, present status and a view towards the future." Progress in Oceanography (2008): 95-105. doi:10.1016/j.pocean.2008.10.012
^Penven, P., V. Echevin, J. Pasapera, F. Colas, and J. Tam (2005), Average circulation, seasonal cycle, and mesoscale dynamics of the Peru Current System: A modeling approach, J. Geophys. Res., 110, C10021, doi:10.1029/2005JC002945.
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and writings of German scientist, naturalist and explorer Alexander von Humboldt. It maintained a certain ethics of precision and observation, which combined...
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crustaceans and algae, thanks to the oxygen-rich water carried in by the HumboldtCurrent. Chile is also one of the world's largest producers of wine and many...
waters around the Galápagos Islands because of the cool waters of the HumboldtCurrent and the resulting winds. Why the albatrosses became extinct in the...
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