Portal:Oceans
The Oceans Portal
A portal dedicated to oceans, seas, oceanography and related topics
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Introduction
Earth's ocean |
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Main five oceans division: Further subdivision: Marginal seas |
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The ocean is the body of salt water that covers approximately 70.8% of Earth. In English, the term ocean also refers to any of the large bodies of water into which the world ocean is conventionally divided. The following names describe five different areas of the ocean: Pacific, Atlantic, Indian, Antarctic/Southern, and Arctic. The ocean contains 97% of Earth's water and is the primary component of Earth's hydrosphere; thus the ocean is essential to life on Earth. The ocean influences climate and weather patterns, the carbon cycle, and the water cycle by acting as a huge heat reservoir. (Full article...)
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A sea is a large body of salty water. There are particular seas and the sea. The sea commonly refers to the World Ocean, the wider body of seawater. Particular seas are either marginal seas, second-order sections of the oceanic sea (e.g. the Mediterranean Sea), or certain large, nearly landlocked bodies of water. (Full article...)
Oceanography (from Ancient Greek ὠκεανός (ōkeanós) 'ocean' and γραφή (graphḗ) 'writing'), also known as oceanology, sea science, ocean science, and marine science, is the scientific study of the ocean. It is an Earth science, which covers a wide range of topics, including ecosystem dynamics; ocean currents, waves, and geophysical fluid dynamics; plate tectonics and seabed geology; and fluxes of various chemical substances and physical properties within the ocean and across its boundaries. These diverse topics reflect multiple disciplines that oceanographers utilize to glean further knowledge of the world ocean, including astronomy, biology, chemistry, geography, geology, hydrology, meteorology and physics. Paleoceanography studies the history of the oceans in the geologic past. An oceanographer is a person who studies many matters concerned with oceans, including marine geology, physics, chemistry, and biology. (Full article...)
Selected article -
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Ocean acidification is the ongoing decrease in the pH of the Earth's ocean. Between 1950 and 2020, the average pH of the ocean surface fell from approximately 8.15 to 8.05. Carbon dioxide emissions from human activities are the primary cause of ocean acidification, with atmospheric carbon dioxide (CO2) levels exceeding 410 ppm (in 2020). CO2 from the atmosphere is absorbed by the oceans. This chemical reaction produces carbonic acid (H2CO3) which dissociates into a bicarbonate ion (HCO−3) and a hydrogen ion (H+). The presence of free hydrogen ions (H+) lowers the pH of the ocean, increasing acidity (this does not mean that seawater is acidic yet; it is still alkaline, with a pH higher than 8). Marine calcifying organisms, such as mollusks and corals, are especially vulnerable because they rely on calcium carbonate to build shells and skeletons.
A change in pH by 0.1 represents a 26% increase in hydrogen ion concentration in the world's oceans (the pH scale is logarithmic, so a change of one in pH units is equivalent to a tenfold change in hydrogen ion concentration). Sea-surface pH and carbonate saturation states vary depending on ocean depth and location. Colder and higher latitude waters are capable of absorbing more CO2. This can cause acidity to rise, lowering the pH and carbonate saturation levels in these areas. There are several other factors that influence the atmosphere-ocean CO2 exchange, and thus local ocean acidification. These include ocean currents and upwelling zones, proximity to large continental rivers, sea ice coverage, and atmospheric exchange with nitrogen and sulfur from fossil fuel burning and agriculture. (Full article...)Interesting facts -
- The color of the sea snail Simnia spelta varies, but when it grazes on the white gorgonian it mimics the twigs.
- A sculpture of the god Neptune on one of the parapets of the University of Washington's Gerberding Hall represents the academic disciplines of oceanography and fisheries science.
- After sinking the British ocean liner SS Dwinsk in June 1918, the German submarine U-151 remained in the area and used the survivors in seven lifeboats as a lure in order to try and sink additional Allied ships.
Selected list articles and Marine habitat topics
Marine habitats |
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Coastal habitats |
Ocean surface |
Open ocean |
Sea floor |
- List of oceans
- List of ancient oceans
- List of seas
- List of circumnavigations
- List of cruise lines
- List of largest lakes and seas in the Solar System
- List of marine biologists
- List of marine ecoregions
- List of maritime explorers
- List of naval battles
- List of ocean liners
- List of oceanographic institutions and programs
- List of oldest surviving ships
- List of rogue waves
- List of seafood dishes
- List of submarine topographical features
Tasks
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Related portals
In the news
- 4 September 2024 – Mediterranean Sea migrant smuggling
- Seven people are rescued and at least 21 others remain missing after a boat carrying Syrian migrants from Libya capsizes off the coast of Lampedusa in the Pelagie Islands of Italy. (Al Jazeera)
- 2 September 2024 – Red Sea crisis
- Houthi militants strike two crude oil tankers in the Red Sea with multiple missiles and drones. (Reuters)
- 31 August 2024 – Red Sea crisis
- The Houthis claim they have attacked the Liberia-flagged container ship MV Groton for the second time in the Gulf of Aden. (Reuters)
- 29 August 2024 – 2024 Red Sea oil spill
- The Houthis release footage showing their fighters boarding and placing explosives on the Greek-flagged MT Sounion oil tanker, causing explosions that put the tanker at risk of causing a major oil spill in the Red Sea. (AP)
- 29 August 2024 – Migrant vessel incidents on the Mediterranean Sea
- Pope Francis strongly condemns European mistreatment of migrants crossing from the Mediterranean Sea and refusal to offer aid as means to reject them from entering European nations as "a grave sin", and requests the expansion of migrant access routes to the continent. (The Hill) (Reuters)
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Wiktionary
Dictionary and thesaurus
Admiralty law
Admiralty law |
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History |
Features |
Contract of carriage/Charterparty |
Parties |
Judiciaries |
International conventions |
International organizations |
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External media
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- World Ocean Database and World Ocean Atlas Series – from the U.S. National Centers for Environmental Information, National Oceanic and Atmospheric Administration. Includes the World Ocean Atlas.
- European Atlas of the Seas – the European Atlas of the Seas, from the European Commission
- NOAA Research – NOAA research news, Oceanic and Atmospheric Research (OAR)
- Ocean Research – from The World Ocean Observatory
- Ocean Biodiversity Information System – "a global open-access data and information clearing-house on marine biodiversity for science, conservation and sustainable development"