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| SEA | |
|---|---|
| Name | Sea |
| Type | Body of saltwater |
| Area | Varies by example |
| Max-depth | Varies by example |
| Countries | See individual seas |
SEA
A sea is a principal type of large saline body of water found across Earth, represented by numerous named bodies such as the Mediterranean Sea, Caribbean Sea, South China Sea, Baltic Sea, and North Sea. Seas connect to major ocean basins like the Atlantic Ocean, Pacific Ocean, and Indian Ocean and are central to studies in Oceanography, Meteorology, Plate tectonics, Maritime law, and maritime cultures such as those of the Polynesia region or the Malay Archipelago. They have distinct boundaries, bathymetry, and ecological communities that differ from enclosed lakes and transoceanic passages like the Strait of Gibraltar or the Bering Strait.
The English term derives from Old English and Proto-Germanic roots, historically paralleled by terms in Latin and Greek used by authors such as Pliny the Elder and Herodotus. Nomenclature for specific seas follows traditions established by cartographers like Ptolemy and later standardized through institutions such as the International Hydrographic Organization and national surveys exemplified by the British Admiralty. Legal frameworks for sea-related names and zones appear in instruments like the United Nations Convention on the Law of the Sea and disputes over nomenclature have involved states such as Japan and China in cases like naming of the East China Sea.
Seas occur in coastal settings (e.g., the Adriatic Sea), as semi-enclosed basins (e.g., the Mediterranean Sea), as marginal seas of oceans (e.g., the North Atlantic Ocean's Norwegian Sea), and as inland saline bodies often named “seas” such as the Caspian Sea and Aral Sea. Types include continental shelf seas like the Baltic Sea, marginal seas like the South China Sea, and interior seas like the Black Sea. Oceanographic features—such as currents exemplified by the Gulf Stream and gyres like the North Pacific Gyre—shape sea geography, while tectonic settings around features like the Mid-Atlantic Ridge and subduction zones near the Mariana Trench determine bathymetric extremes.
Seawater salinity typically averages ~35 PSU, but varies notably in the Red Sea, Baltic Sea, and Dead Sea where evaporation or freshwater input alters ionic composition. Thermohaline properties drive global circulation patterns including the Atlantic Meridional Overturning Circulation and influence climate teleconnections studied alongside phenomena such as the El Niño–Southern Oscillation. Chemical cycles in seas involve carbon exchange with the atmosphere, nutrient dynamics influenced by rivers like the Amazon River and Yangtze River, and biogeochemical processes mediated by microbial taxa first examined during expeditions like the Challenger expedition. Trace element budgets and pollutants—from runoff linked to the Mississippi River to hydrocarbon inputs following incidents like the Deepwater Horizon oil spill—alter redox and acid–base equilibria in coastal shelves.
Seas host diverse communities including phytoplankton assemblages described by researchers from institutions like the Scripps Institution of Oceanography and the Woods Hole Oceanographic Institution, macroalgae beds such as kelp forests along the California Current system, coral reef provinces exemplified by the Great Barrier Reef and reef systems in the Coral Triangle, and pelagic predators tracked via programs associated with the Monterey Bay Aquarium Research Institute. Ecosystem structure reflects trophic linkages from zooplankton grazers monitored in studies influenced by the Continuous Plankton Recorder to apex predators such as great white shark populations noted in the South African and Australian coasts. Endemic assemblages occur in marginal basins like the Mediterranean Sea and unique hydrothermal communities are found along the East Pacific Rise.
Human engagement with seas spans prehistoric maritime cultures of Austronesian peoples, classical navigation by Phoenicians, seafaring of the Vikings, age-of-sail empires such as the Spanish Empire and British Empire, and modern navies including forces from the United States Navy and People's Liberation Army Navy. Sea routes like the Silk Road's maritime branches, the Suez Canal, and the Panama Canal reshaped global trade, while explorers from James Cook to Ferdinand Magellan expanded hydrographic knowledge. Historical events such as the Battle of Trafalgar and treaties like the Treaty of Tordesillas have shaped sovereignty, while coastal urbanization around ports like Shanghai, Rotterdam, Alexandria, and Istanbul illustrates long-term human dependency.
Seas underpin fisheries targeted by fleets from countries including Japan, Norway, Peru, and Iceland and regulated through regimes such as the Common Fisheries Policy and regional fisheries management organizations like the North East Atlantic Fisheries Commission. Offshore oil and gas developments in basins like the North Sea and Gulf of Mexico and mineral exploration for polymetallic nodules in the Clarion-Clipperton Zone are economically significant. Shipping lanes traversing chokepoints such as the Strait of Hormuz and Malacca Strait facilitate containerized trade, while emerging sectors—marine biotechnology researched at institutions like KAUST and renewable energy projects including offshore wind farms in the North Sea—diversify use.
Seas face pressures from overfishing documented by organizations like the Food and Agriculture Organization and from pollution episodes including plastic accumulation in gyres identified by researchers at Ocean Conservancy and 5 Gyres Institute. Climate-driven impacts—sea surface warming, ocean acidification linked to atmospheric CO2 from the Intergovernmental Panel on Climate Change reports, and sea-level rise affecting low-lying states such as Maldives and Bangladesh—threaten ecosystems and communities. Conservation responses involve marine protected areas under frameworks like the Convention on Biological Diversity, transboundary initiatives exemplified by the Black Sea Commission, and restoration projects such as seagrass and mangrove rehabilitation supported by groups like The Nature Conservancy.
Category:Bodies of water