Maggie (@15700) • Hey
A sea is a large body of salty water.
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- The waves reach their maximum height when the rate at which they are travelling nearly matches the speed of the wind. In open water, when the wind blows continuously as happens in the Southern Hemisphere in the Roaring Forties, long, organised masses of water called swell roll across the ocean.
- A strong blow over the ocean causes larger waves as the moving air pushes against the raised ridges of water.
- The friction between air and water caused by a gentle breeze on a pond causes ripples to form.
- Wind blowing over the surface of a body of water forms waves that are perpendicular to the direction of the wind.
- Additional contributions, as much as one quarter of the total, come from water sources on land, such as melting snow and glaciers and extraction of groundwater for irrigation and other agricultural and human needs.
- Most of this rise can be attributed to an increase in the temperature of the sea due to climate change, and the resulting slight thermal expansion of the upper 500 metres (1,600 ft) of water.
- For at least the last 100 years, sea level has been rising at an average rate of about 1.8 millimetres (0.071 in) per year.
- At the last glacial maximum, some 20,000 years ago, the sea level was about 125 metres (410 ft) lower than in present times (2012).
- At the last glacial maximum, some 20,000 years ago, the sea level was about 125 metres (410 ft) lower than in present times (2012).
- The main factor affecting sea level over time is the result of changes in the oceanic crust, with a downward trend expected to continue in the very long term.
- Over most of geologic time, the sea level has been higher than it is today.
- There is insufficient light for photosynthesis and plant growth beyond a depth of about 200 metres (660 ft).
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- Yellow and green light reach greater depths, and blue and violet light may penetrate as deep as 1,000 metres (3,300 ft).
- Much light gets reflected at the surface, and red light gets absorbed in the top few metres.
- The amount of light that penetrates the sea depends on the angle of the sun, the weather conditions and the turbidity of the water.
- Ocean deoxygenation is projected to increase hypoxia by 10%, and triple suboxic waters (oxygen concentrations 98% less than the mean surface concentrations), for each 1 °C of upper-ocean warming.
- Climate change is likely to reduce levels of oxygen in surface waters since the solubility of oxygen in water falls at higher temperatures.
- In its absence, organic material is broken down by anaerobic bacteria producing hydrogen sulphide.
- In the deep sea, where insufficient light penetrates for plants to grow, there is very little dissolved oxygen.
- At night, photosynthesis stops, and the amount of dissolved oxygen declines.
- which dissolves in the seawater and is used by marine animals.
- In daylight, the photosynthetic activity of these plants produces oxygen,
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- These are mainly algae, including phytoplankton, with some vascular plants such as seagrasses.
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- The amount of oxygen found in seawater depends primarily on the plants growing in it.
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- The extent of further ocean chemistry changes, including ocean pH, will depend on climate change mitigation efforts taken by nations and their governments.
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- about 30–40% of the added CO2 is absorbed by the oceans, forming carbonic acid and lowering the pH (now below 8.1) through a process called ocean acidification.
- More recently, climate change has resulted in an increase of the carbon dioxide content of the atmosphere;
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- Seawater is slightly alkaline and had an average pH of about 8.2 over the past 300 million years.
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- Nilas may have a salinity of 12–15 ‰, but by the time the sea ice is one year old, this falls to 4–6 ‰.
- In the process of freezing, salt water and air are trapped between the ice crystals.
- These slide under each other and coalesce to form floes.
- In more turbulent seas, frazil crystals join into flat discs known as pancakes.
- which thickens as new ice forms on its underside.
- In calm conditions, this freezes into a thin flat sheet known as nilas,
- These break into small pieces and coalesce into flat discs that form a thick suspension known as frazil.
- When its temperature becomes low enough, ice crystals form on the surface.
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- Seawater with a typical salinity of 35 ‰ has a freezing point of about −1.8 °C (28.8 °F).
- Deep seawater has a temperature between −2 °C (28 °F) and 5 °C (41 °F) in all parts of the globe.
- before eventually welling up again towards the surface.
- The cold water moves back towards the equator as a deep sea current, driven by changes in the temperature and density of the water,