- Strait of Gibraltar
The Strait of Gibraltar (Arabic: مضيق جبل طارق, Spanish: "Estrecho de Gibraltar") is the
straitthat connects the Atlantic Oceanto the Mediterranean Seaand separates Spainfrom Morocco. The name comes from Gibraltar, which in turn originates from the Arabic "Jebel Tariq" (جبل طارق) meaning mountain of Tariq. It refers to the UmmayadBerber general Tariq ibn-Ziyadwho led the Islamic conquest of Hispania in 711. [ [http://www.gibraltar.gov.gi/gov_depts/port/port_index.htm "Gibraltar port website"] , retrieved June 10, 2007.] It is also known as the Straits of Gibraltar or STROG (Strait Of Gibraltar), the latter being in naval use. [See, for instance, [http://www.nato.int/shape/about/natomedals.htm Nato Medals: Medal for Active Endeavor] , awarded for activity in the international water of the Mediterranean and STROG.]
There are 13 km (8
miles) of ocean separating Europe from Africa at the strait's narrowest point. The strait depth ranges between convert|300|and|900|m|ft. [See Robinson, Allan Richard and Paola Malanotte-Rizzoli, "Ocean Processes in Climate Dynamics: Global and Mediterranean Examples". Springer, 1994, p. 307, ISBN 0792326245.] A ferry commutes between the two continents. The Spanish part of the strait is protected under the El Estrecho Natural Park.
On the northern side of the Strait is
Spainand Gibraltar, while on the southern side is Moroccoand Ceuta, a Spanish exclavein North Africa. Its boundaries were known in antiquity as the Pillars of Hercules. There are several small islands, such as the disputed Isla Perejil, that are claimed by both Spain and Morocco. [Tremlett, Giles, "Moroccans seize Parsley Island and leave a bitter taste in Spanish mouths," in " The Guardian", July 13, 2002.] .
Due to its location, the strait is widely used for illegal immigration from Africa to Europe.
About 6 million years ago, the Strait closed, effectively turning the Mediterranean into a huge salty lake that eventually dried up, in what is known as the
Messinian Salinity Crisis. At the Miocene/ Plioceneboundary, approximately 5.33 million years ago, the Strait opened up for the last time, and has remained open since. [Cloud, P., "Oasis in space. Earth history from the beginning", New York: W.W. Norton & Co. Inc., p. 440. ISBN 0393019527]
The Straits are an important
shipping routefrom the Mediterraneanto the Atlantic. There are ferriesthat operate between Spain and Morocco across the strait, as well as between Spain and Ceutaand Gibraltarto Tangier.
Tunnel across the strait
In December 2003, Spain and Morocco agreed to explore the construction of an undersea rail
tunnelto connect their rail systems. The gauge of the tunnel would be convert|1435|mm|ftin|abbr=on|lk=on to match the proposed construction and conversion of significant parts of the existing broad gauge system to standard gauge. [ [http://news.bbc.co.uk/2/hi/africa/3317149.stm "Europe-Africa rail tunnel agreed"] BBC.co.uk]
=Inflow and outflow= On a net basis, water continually flows eastward through the Strait of Gibraltar, due to an evaporation rate within the Mediterranean basin higher than the combined inflow of all the rivers that empty into it. The sill of the Strait of Gibraltar acts to limit mixing between the cold, less saline Atlantic water and the warm Mediterranean waters. The latter are so much saltier that they sink below the constantly incoming Atlantic water and form a highly saline ("thermohaline", both warm and salty) bottom water, called the
Mediterranean outflow. A density boundary separates the layers at about convert|100|m depth. It flows out and down the continental slope, losing salinity, until it equilibrates after mixing at a depth of about convert|1000|m. The Mediterranean outflow water can be traced for thousands of kilometers before losing its identity. Internal waves (waves at the density boundary layer) are common in the strait. Like traffic merging on a highway, the water flow is constricted in both directions because it must pass over a shallow submarine barrier, the Camarinal Sill. When large tidal flows enter the Strait, internal waves are set off at the Camarinal Sill as the high tide relaxes. The waves—sometimes with heights up to convert|100|m travel eastward. Even though the waves occur at great depth and the height of the waves at the surface is almost nothing, they can be traced in the sunglintbecause they concentrate the biological films on the water surface, creating slight differences in roughness. The waves flow eastward, refract around coastal features; can be traced for as much as convert|100|km, and sometimes create interference patterns with refracted waves. [Wesson, J.C. and M.C. Gregg, "Mixing at Camarinal Sill in the Strait of Gibraltar," in "Journal of Geophysical Research", Vol. 99, No. C5, 1994, pp.9847–9878.]
The place is very interesting for eolic power production,
List of straits
* [http://www.agu.org/sci_soc/eosrjohnson.html Climate Control Requires a Dam at the Strait of Gibraltar] — American Geophysical Union, 1997. Accessed 26 February 2006.
* [http://www.un.org/documents/ecosoc/docs/2001/e2001-19.pdf Project for a Europe-Africa permanent link through the Strait of Gibraltar] — United Nations Economic and Social Council, 2001. Accessed 26 February 2006.
] — Multimap.com, 2006. Accessed 26 February 2006.
*es icon [http://www.cica.es/aliens/geo/gibraltar/gibraltar.html Estudios Geográficos del Estrecho de Gibraltar] — La Universidad de Tetuán and La Universidad de Sevilla. Accessed 26 February 2006.
*cite web | url=http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=16581 | title=Solitons, Strait of Gibraltar | publisher=
NASA Earth Observatory| accessdate=2006-05-24
*cite web | url=http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=4707 | title=Internal Waves, Strait of Gibraltar | publisher=
NASA Earth Observatory| accessdate=2006-05-24
References and notes
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Look at other dictionaries:
Strait of Gibraltar — noun the strait between Spain and Africa • Instance Hypernyms: ↑strait, ↑sound • Part Meronyms: ↑Pillars of Hercules … Useful english dictionary
Strait of Gibraltar — noun A strait between Spain and Morocco, connecting the Mediterranean Sea and the Atlantic Ocean. Syn: STROG … Wiktionary
Strait of Gibraltar — n. narrow sea passage between Spain and Morocco which links the Atlantic Ocean and the Mediterranean Sea … English contemporary dictionary
Gibraltar (disambiguation) — Gibraltar can refer to:* Gibraltar, a British overseas territory on the South of the Iberian Peninsula where the Mediterranean Sea meets the Atlantic Ocean ** The Strait of Gibraltar, at the western end of the Mediterranean Sea ** The Bay of… … Wikipedia
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Gibraltar — Gibraltarian /ji brawl tair ee euhn, jib rawl /, adj., n. /ji brawl teuhr/, n. 1. a British crown colony comprising a fortress and seaport located on a narrow promontory near the S tip of Spain. 29,934; 17/8 sq. mi. (5 sq. km). 2. Rock of. a.… … Universalium
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Gibraltar Bridge — The Gibraltar Bridge is a conceptual structure spanning the Strait of Gibraltar that would connect Europe to Africa. [ [http://dsc.discovery.com/tv schedules/special.html?paid=1.403.30405.0.0 Engineering the Impossible] ] Several engineers have… … Wikipedia
Gibraltar — <p></p> <p></p> Introduction ::Gibraltar <p></p> Background: <p></p> Strategically important, Gibraltar was reluctantly ceded to Great Britain by Spain in the 1713 Treaty of Utrecht; the British… … The World Factbook
strait — straitly, adv. straitness, n. /strayt/, n. 1. Often, straits. (used with a sing. v.) a narrow passage of water connecting two large bodies of water. 2. Often, straits. a position of difficulty, distress, or need: Ill and penniless, he was in sad… … Universalium