Who knows what effect ocean currents have on human beings? It is best to give specific examples. ..

/kloc-in the 0 th and 8 th centuries, Franklin discovered that American ships crossed the Atlantic Ocean, and the voyage was usually about two weeks faster than that of British ships. After consulting people, he learned that American ships used to sail downstream by means of the North Atlantic Ocean current, which shortened the sailing time a lot. Later, he drew a picture to show this ocean current, which is the first ocean current map in the world.

For people engaged in maritime activities, ocean currents often imply many dangers (case report). Before launching, you should know more about the changes of ocean currents in the nearby waters.

Franklin's map of the North Atlantic current.

Distribution of fish in the ocean

The areas with significant upwelling in the world are also areas with more fish production. Fish in the sea are very sensitive to the change of seawater temperature. If the upwelling sea area is disturbed and suddenly disappears, it will cause great disaster to the marine life. For example, the upwelling phenomenon caused by the original Peruvian ocean current passing through the Peruvian coast; At the beginning of 1925, the Peruvian current suddenly disappeared and other warm currents flowed in, and the seawater temperature suddenly rose by about 7℃ for two months, resulting in the death of a large number of marine life.

Keep the ocean heat constant.

In the low latitudes near the equator and subtropics, the heat radiated by sunlight exceeds the heat emitted from the sea surface to the atmosphere, while the heat emitted in the high latitudes is more than the heat. Therefore, the excess heat in the equatorial region can be transported to the north through the conveyor belt of ocean currents to make up for the reduced heat in high-latitude seas and keep the global ocean heat unchanged.

Regulating climate

The interaction between surface ocean current and atmosphere will affect the climate of coastal land. The annual average water temperature in the surface layer of the Gulf Stream is as high as 25 ~ 26, and the heat transported per kilometer in the coasts of western Europe and northern Europe is equivalent to the heat released by burning 60 million tons of coal every year, resulting in a humid and warm maritime climate in northwest Europe and some ice-free ports. When lush forests grow on the continent of northwest Europe, Greenland at the same latitude is covered with huge ice sheets.

When the air on the sea surface blows through the upwelling area, when it is cold, it will condense too much water into small drops, so the sea surface in the upwelling area is often foggy, and there will also be foggy weather on the adjacent land. It is for this reason that San Francisco is foggy in spring and summer. London has become a famous foggy city because there is a vast upwelling sea area nearby. The land near the upwelling area is often blown by this sea breeze and plants with high humidity and salinity for a long time.