sea circulation

Large-scale horizontal water motion within an ocean. The way energy from the sun, stored in the sea, is transported around the world. The currents explain, for example, why the UK has ice-free ports in winter, while St. Petersburg, at the same latitude as the Shetland Islands, needs ice breakers. Evidence is growing that the world's ocean circulation was very different during the last ice age and has changed several times in the distant past, with dramatic effects on climate. The oceans are vital as storehouses, as they absorb more than half the sun's heat reaching the earth. This heat, which is primarily absorbed near the equator is carried around the world and released elsewhere, creating currents which last up to 1.000 years. As the Earth rotates and the wind acts upon the surface, currents carry warm tropical water to the cooler parts of the world. The strength and direction of the currents are affected by landmasses, bottlenecks through narrow straits, and even the shape of the sea-bed. When the warm water reaches polar regions its heat evaporates into the atmosphere, reducing its temperature and increasing its density. When sea-water freezes it leaves salt behind in the unfrozen water and this cold water sinks into the ocean and begins to flow back to the tropics. Eventually it is heated and begins the cycle all over again. (Source: MGH / WRIGHT)

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Displaying results 1 - 50 of 72 record(s) tagged with this keywordClick/tap on any title to see full details of the record
Zhu B 2016. A Review on Late Quaternary Environmental Change in the Namibia, South-Western Africa. Journal of Earth Science and Climatic Change 7 (4) 1-9
Berger WH, Lange CB, Wefer G 2001. Namibia Upwelling: Ocean Meadows off the Desert.
Downloadable files:
Attachment Size
Namibia Upwelling_Ocean Meadows off the Desert.pdf 145.94 KB
Anderson L, Maslin MA, Jansen F, Lin H, Pufahl PK, Pérez M, Brüchert V, Vidal L 1998. Lithostratigraphic Summary For Leg 175: Angola-Benguela Upwelling System. Proceedings of the Ocean Drilling Program Initial Reports (175) 533-542
Goodisan P 1991. The Namibian Fisheries Experience. Samudra 5-6 16-20
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The Namibian Fisheries Experience.pdf 335.73 KB
Shannon LV, O'Toole MJ 2003. Sustainability of the Benguela: ex Africa semper aliquid novi. Large Marine Ecosystems of the World: Trends in Exploitation, Protection and Research 227-253
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Sustainability of the Benguela_ex Africa semper aliquid novi.pdf 502.9 KB
Lett C, Veitch J, Van der Lingen CD, Hutchings L 2007. Assessment of an environmental barrier to transport of ichthyoplankton from the southern to the northern Benguela ecosystems. Marine Ecology Progress Series 347 247-259
Borchers SL, Schnetger B, Böning P, Brumsack H-J 2005. Geochemical signatures of the Namibian diatom belt: Perennial upwelling and intermittent anoxia. Geochemistry, Geophysics, Geosystems 6 (6)
Schukat A, Bode M, Auel H, Carballo R, Martin B, Koppelmann R, Hagen W 2013. Pelagic decapods in the northern Benguela upwelling system: Distribution, ecophysiology and contribution to active carbon flux. Deep Sea Research Part I: Oceanographic Research Papers 75 146-156
Arhan M, Mercier H, Park Y-H 2003. On the deep water circulation of the eastern South Atlantic Ocean. Deep Sea Research Part I: Oceanographic Research Papers 50 (7) 889-916
Santana-Casiano JM, Gonzales-Davila M, Ucha IR 2009. Carbon dioxide fluxes in the Benguela upwelling system during winter and spring: A comparison between 2005 and 2006. Deep Sea Research Part II: Topical Studies in Oceanography 56 (8-10) 533-541
Dingle RV, Bremner JM, Giraudeau J, Buhmann D 1996. Modern and palaeo-oceanographic environments under Benguela upwelling cells off southern Namibia. Palaeogeography, Palaeoclimatology, Palaeoecology 123 (1-4) 85-105
Inthorn M, Rutgers van der Loeff M, Zabel M 2006. A study of particle exchange at the sediment–water interface in the Benguela upwelling area based on 234Th/238U disequilibrium. Deep Sea Research Part I: Oceanographic Research Papers 53 (11) 1742-1761
Küster-Heinsa K, Steinmetz E, de Lange GJ, Zabel M 2010. Phosphorus cycling in marine sediments from the continental margin off Namibia. Marine Geology 274 (1-4) 95-106
Brüchert V, Jørgensen BB, Neumann K, Riechmann D, Schlösser M, Schulz H 2003. Regulation of bacterial sulfate reduction and hydrogen sulfide fluxes in the central namibian coastal upwelling zone. Geochimica et Cosmochimica Acta 67 (23) 4505-4518
Emeis K-C, Brüchert V, Currie B, Endler R, Ferdelman T, Kiessling A, Leipe T, Noli-Peard K, Struck U, Vogt T 2004. Shallow gas in shelf sediments of the Namibian coastal upwelling ecosystem. Continental Shelf Research 24 (6) 627-642
Schukat A, Auel H, Teuber L, Lahajnar N, Hagen W 2014. Complex trophic interactions of calanoid copepods in the Benguela upwelling system. Journal of Sea Research 85 186-196
Rosell-Mele A, Martínez-Garcia A, McClymont EL 2014. Persistent warmth across the Benguela upwelling system during the Pliocene epoch. Earth and Planetary Science Letters 386 10-20
Dingle RV, Bremner JM, Giraudeau J, Buhmann D 1996. Modern and palaeooceanographic environments under Benguela upwelling cells of southern Namibia. Palaeogeography, Palaeoclimatology, Palaeoecology 123 (1-4) 85-105