The total salinity in the ocean is generally relatively fixed, why is the salinity of frozen sea wat

The main reason is that after the seawater freezes, the water solidifies, but the salt remains in the seawater, so the salinity of the frozen seawater is high.

Because the freezing is mainly the solidification of the water contained in the seawater, and most of the salt is still retained in the seawater, after the freezing of the seawater, it will hinder the gas exchange between the air and the seawater, so that the amount of dissolved oxygen in the seawater will be reduced, which is not conducive to the growth of marine animals.

Due to the influence of some climatic reasons, the amount of precipitation and evaporation will change, resulting in freezing and high salinity of seawater.

When seawater freezes, the freshwater in it turns into ice, and the remaining seawater becomes smaller, and the salt in it increases, so the salinity increases. When the ice melts, the salinity decreases due to the increase in the volume of seawater.

Due to the high salinity, seawater is not easy to freeze, similar to the reason that salt can be thawed on the frozen road, so seawater freezing often starts to freeze from the coast, and it will no longer freeze after a certain range. Most of the ice floes in the sea come from river ice.

However, in the sea area at higher latitudes, the sea temperature is low due to the lower air temperature, and at this time, a part of the salts dissolved in the seawater are analyzed and dissolved in the surrounding seawater, making the surrounding seawater less likely to freeze, and turning into extremely cold and salty seawater, with high salinity. This part of the supercooled seawater comes into contact with the lower salinity of the salted seawater, and the lower salinity of the seawater freezes. The combination of extremely cold and salty seawater and the freezing of seawater decreases the seawater, and the salinity of the seawater increases.

When the ice melts, the temperature rises, and this part of the seawater with low salinity changes from a frozen state to seawater, and the seawater increases. The sea temperature rises, and the less salinity of the sea resolves the precipitated salt. Plus the dissolution of river ice discharged into the sea. The salinity of the sea water decreases.

Desalination of seawater by freezing and desalination.

At present, the seawater desalination methods used include seawater freezing method, electrodialysis method, distillation method, reverse osmosis method, and ammonium carbonate ion exchange method, and the current application of reverse osmosis membrane method and distillation method is the mainstream in the market.

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Because the freezing is mainly the solidification of the water contained in the seawater, and most of the salt is still retained in the seawater, after the seawater freezes, it will hinder the gas exchange between the air and the seawater, so that the amount of dissolved oxygen per mu of seawater will be reduced, which is not conducive to the growth of marine animals.

1. Climatic factors.

The climatic factors affecting seawater mainly consider the "comparative relationship between precipitation and evaporation". Because precipitation dilutes seawater and evaporation concentrates seawater, the most important factors affecting salinity in the open sea and oceans are precipitation and evaporation.

2. Ocean currents. The salinity of the sea area through which the warm current passes at the same latitude is high, and the salinity of the sea area through which the cold current passes is low.

3. Runoff into the sea.

A large amount of fresh water from the land flows in, which has a dilution effect on the seawater. Therefore, the presence or absence of fresh water from terrestrial rivers is also one of the factors affecting salinity. Since many rivers are mainly fed by rain, seasonal cavitation of rain will cause seasonal changes in river runoff, and seasonal changes in runoff will also cause seasonal changes in seawater salinity.

Seawater salinity is the ratio of all dissolved solids in seawater to the weight of seawater, usually expressed in grams per kilogram of seawater. Salinity is used to express the mass fraction of salts in seawater. The average salinity of the world's oceans is 35.

A scale of the salinity content of seawater. The salinity of seawater is an important characteristic of seawater, and it is the basic parameter for studying the physical and chemical processes of seawater, along with temperature and pressure. Many phenomena and processes in the ocean are often related to the distribution and change of salinity, so the study of the distribution and change law of salinity in the ocean occupies an important position in marine science.

When the seawater freezes, the salt in the water is retained in the crystal because it cannot crystallize with the water molecules, and the eggplant segment is squeezed out, forming a residual water with high salinity, which is gradually discharged into the surrounding water body with the formation and drift of sea ice, resulting in an increase in the salinity of the surrounding seawater.

This is because the salt in seawater is mainly composed of ions dissolved in water, such as sodium chloride. When frozen, as the temperature of the sea water decreases, the water molecules coalesce to form crystals, while the salt separators are left outside the crystals, gradually forming residual water with high salinity. This remnant water can settle on the ocean floor as it shudders and drift to other parts of the ice, affecting the salinity of the surrounding seawater.

Therefore, the increase in salinity of frozen seawater is due to the extrusion of salt separators and the formation of residual water during the freezing process.

Seawater salinity is the concentration of salt in seawater, what is the average salinity of the world's oceans?

Correct answer) Answer analysis: Seawater salinity refers to the ratio of all dissolved solids in seawater to the simple amount of seawater dust, and people use salinity to express the mass fraction of salts in seawater. The average salinity of the world's oceans is 35.

The factors that affect the salinity of seawater are the amount of precipitation, evaporation, runoff, solubility and other factors of seawater. Seawater salinity is the ratio of all dissolved solids in seawater to the weight of seawater, usually expressed in grams per kilogram of seawater. Salinity is usually used to express the mass fraction of salts in seawater.

The average salinity of the world's oceans is 35.

The surface of the world's oceans is affected by evaporation, precipitation, icing, ice melt and land runoff, and the salinity distribution is uneven: the salinity near the poles, the equatorial region and the sea area affected by land runoff is relatively small; In the sea area at 20 degrees north and south latitude, the salinity of the sea is relatively large. The salinity of deep seawater varies little and is mainly controlled by physical processes such as circulation and turbulent mixing.

Based on the characteristics of the salinity distribution in the ocean, it is possible to identify water masses and understand their movements. The influence of salinity should be taken into account when studying the interaction and equilibrium relationship between ions in seawater, exploring the law of element migration in seawater, and determining certain components dissolved in seawater. In addition, because it is often difficult to determine the density of seawater directly and accurately in the field, salinity, temperature and pressure are usually measured in various countries, and then the density is calculated according to the equation of state of seawater.

Freezing is the formation of ice in seawater, and ice melting is the melting of ice, because there is no salt in the ice, so the freezing will precipitate salt, thereby increasing the salinity of the unfrozen seawater, and the melting of ice will dilute the seawater and reduce the salinity of the seawater.

Seawater freezes more than freshwater. Because the salinity of the ocean surface is generally greater than that, the freezing point is lower; When the sea surface water temperature reaches the freezing point, convection is formed due to the increase of density, which makes the sea water with higher temperature in the lower layer rise, so it is more difficult to freeze. When the whole layer of seawater reaches the freezing point and the seawater freezes, it will continue to precipitate salt.

Summary. Hello dear, the low temperature, low salinity and high density of sea water in the polar regions are the result of a combination of factors. First of all, the sea temperature in the polar regions is lower, much lower than in other regions, which makes the sea water denser.

Secondly, there is a large amount of ice and snow melting in the polar regions, and this fresh water will reduce the salinity of the seawater, which will also increase the density of the seawater. Finally, the sea water in the polar regions is subjected to a lot of wind and snow, which will reduce the inorganic salt content in the sea water and also increase the density of the sea water. In short, the low temperature, low salinity and high density of sea water in the polar regions are the result of a combination of factors.

Why is the sea water in the polar regions low in temperature, low salinity, and high in density? Doesn't it mean that the lower the salinity of the seawater, the less dense it is.

Hello dear, the low temperature, low salinity and high density of sea water in the polar regions are the result of a combination of factors. First of all, the sea temperature in the polar regions is much lower than in other regions, which will increase the density of sea water. Secondly, there is a large amount of ice and snow melting in the polar regions, and this fresh water will reduce the salinity of the seawater, which will also increase the density of the seawater.

Finally, the sea water in the polar circle is affected by the wind and snow of the Great Dan bright light, which will reduce the inorganic salt content in the seawater and increase the density of the seawater. In short, the low temperature, low salinity and high density of sea water in the polar regions are the result of a combination of factors.

Doesn't it mean that the lower the salinity, the less dense it is?

No. In general, the lower the salinity of seawater, the less dense it is, but there are exceptions. The sea temperature in the polar regions is lower, much lower than in other regions, which increases the density of the sea.

Secondly, there is a large amount of ice and snow melting in the polar regions, and these fresh waters will reduce the salinity of the seawater, and the stuffiness will also increase the density of the seawater. Finally, the sea water in the polar regions is subjected to a lot of wind and snow, which will reduce the inorganic salt content in the sea water and also increase the density of the sea water. In short, the low temperature, low salinity and high density of seawater in the polar cavity bucket area are the result of the combined action of many factors.