The difference between the sea and the ocean

Different sizes, different positions and different depths.

1, different sizes

The ocean is small. The ocean accounts for about 89% of the total ocean area, is the main body of the whole ocean, and is a veritable big brother; The ocean accounts for about 1 1% of the total area of the ocean. It is a subsidiary part of the ocean and can only be a younger brother.

2. Different positions

The ocean is close to the land and the ocean is far from the land. Due to the direct influence of land rivers and human activities, the water temperature, salinity, water color and transparency of seawater are obviously different from those of the ocean. The Yellow Sea, for example, is named because the Yellow River once brought in a lot of sediment and the water was yellow. In the Bohai Sea with higher latitude, due to the injection of a large amount of fresh water from the Yellow River, the salinity decreases, and a large area freezes every winter. The ocean is far away from the land and is not directly affected by the land water body, so it has less impurities, less pollution and clearer. The transparency of many waters in the ocean can reach tens of meters, and the transparency of the sargasso sea in the Atlantic Ocean is the highest, reaching 72 meters deep.

3. Different depths

The sea is shallow and the ocean is deep. Because it is close to land, the sea is usually located on the continental shelf, so the water depth is very shallow. For example, the average water depth of Bohai Sea is only18m, that of Yellow Sea is only 90m, and that of East China Sea is only 349m. Except the average water depth of the Arctic Ocean is about 1200m, the average water depth of the other three oceans is between 3000m-4000m. Because the sea water is shallow, there is sufficient sunlight transmission from the sea surface to the seabed, and the sea provides a suitable environment for the growth of marine life. So most fishing grounds are distributed in the sea, such as Zhoushan fishing ground. Of course, there are also many fishing grounds in the middle of the ocean. Due to the depth of the ocean and the confluence of cold and warm currents, the flooding of bottom cold water will bring rich nutrients, thus forming a rich fishing ground. For example, both Hokkaido fishing ground and Newfoundland fishing ground are at the intersection of cold current and warm current in the ocean.

The relationship between ocean and ocean

The ocean and the ocean are interrelated, and the ocean is connected with the ocean through the strait between land or islands. Ocean circulation enters the ocean through these straits, thus realizing the water exchange between the ocean and the ocean. Ocean circulation is like arterial blood vessels of human body, which can continuously inject a large amount of fresh water from the ocean into the sea; Ocean currents, like veins, slowly transport seawater back to the ocean.

The ocean has an important influence on the global climate. For example, under the influence of the ocean, the southeast monsoon blowing to China in summer is warm and humid. The climate effect of the ocean is more profound than that of the ocean, and the western Pacific warm pool (generally referring to the warm sea area where the average sea surface temperature of the tropical western Pacific and the eastern Indian Ocean is above 28℃ for many years) is the engine of global climate change.

It directly affects global climate change through Walker circulation and Hadri circulation. When the warm current from the western Pacific warm pool moves eastward to the eastern Pacific Ocean, it will lead to excessive seawater temperature along the coast of Peru and a large number of fish in Peruvian fishing grounds will die, which is the famous El Ni? o phenomenon. At this time, the circulation in Hadri is strengthened, which increases the monsoon, typhoon and rainfall in China, resulting in serious floods in southern China.