Explain the effects of global ocean currents when El Ni o and La Ni a occur 20

The difference between El Niño and La Niña.

1. The movement of the ocean surface is mainly controlled by the sea surface wind. The presence of trade winds causes a large amount of warm water to be blown into the western equatorial Pacific, where the warm water is blown away and is mainly replenished by cold water below the sea surface, and the sea surface temperature in the eastern equatorial Pacific is significantly lower than that in the western Pacific.

When the trade winds intensify, the upturning of the deep sea water in the eastern equatorial Pacific becomes more intense, resulting in abnormally low sea surface temperatures, which makes the airflow sink in the eastern equatorial Pacific, and the upward movement of the airflow in the western part is more intensified, which is conducive to the strengthening of the trade winds, which further exacerbates the development of cold water in the eastern equatorial Pacific and triggers the so-called La Niña phenomenon.

Impacts: Impacts on the east and west shores of the Pacific Ocean near the equator: The east coast is drier and the west coast is wetter, which is prone to flooding. Impact on the global climate: Causes climate anomalies. Impacts on China's climate meditation: as opposed to the impact of El Niño.

2. When the earth's rotation decelerates, the "brake effect He Shixiao Ying" causes the atmosphere and sea water in the equatorial belt to gain an eastward inertia, the equatorial ocean current and trade winds weaken, the warm water in the western Pacific Ocean flows eastward, and the cold water in the eastern Pacific Ocean is blocked, and the El Niño phenomenon of sea water warming and sea level elevation occurs due to the accumulation of warm water.

Impact: The most certain impact is that an El Niño event results in significantly higher global precipitation than normal years. As a result, frequent floods in the central and eastern Pacific and Pacific coastal countries in South America, as well as severe droughts in India, Indonesia and Australia, will affect many crops in the world.

Correct Answer: Peruvian cold snap.

El Niño warm current, is an abnormal natural phenomenon in the Pacific Ocean, in the west coast of South America, the eastern part of the South Pacific, from south to north flow a famous Peruvian cold current, every year from November to March is the summer of the southern hemisphere, the water temperature in the southern hemisphere generally rises, and the equatorial round warm current flowing westward has been strengthened. At this time, the global pressure and wind bands move southward, and the northeast trade winds cross the equator and are deflected to the left by the self-deflecting forces of the southern hemisphere and turn to the northwest monsoon. This irregular ocean current is known as the "Eric Bellil Current".

El Niño, also known as El Niño Current, is a climate phenomenon caused by the eastward movement of the Walker Circulation Circle after the interaction between the ocean and the atmosphere over a large area of the Pacific Equatorial Belt. Normally, the monsoon currents in the tropical Pacific region move from the Americas to Asia, keeping the Pacific surface warm and bringing tropical rainfall around Indonesia. But every 2-7 years, this pattern is disrupted, reversing the direction of winds and ocean currents, and the surface heat flow of the Pacific Ocean turns eastward towards the Americas, taking with it tropical rainfall and causing the so-called "El Niño".

La Niña is a phenomenon in which sea surface temperatures in the eastern and central equatorial Pacific Ocean remain unusually cold (as opposed to El Niño).is a new term used in meteorological and oceanographic circles. It means "little girl", which is exactly the opposite of El Niño, which means "Holy Child", also known as "anti-El Niño" or "cold event".

La Niña: "It is a corrective transition phenomenon after an El Niño year. This hydrological pattern will lead to a decrease in water temperature and drought in the eastern Pacific Ocean, while in contrast to a rise in water temperatures in the western Pacific and significantly more precipitation than in a normal year. Scientists believe that

La Niña, a hydrological phenomenon, will not have a significant impact on the world's climate, but it will bring more and lasting rainfall to Guangdong, Fujian, Zhejiang and even the entire southeast coast for a certain period of time.

Climate impacts of El Niño.

First of all, the number of typhoons has decreased, and after the occurrence of the El Niño phenomenon, the number of tropical storms (typhoons) in the northwest Pacific and the number of landfalls along the coast of China are lower than in normal years.

Usually in the year of El Niño, China's summer monsoon is weak, the monsoon is southerly, located in the central part of China or south of the Yangtze River, and the northern region of China is often prone to drought and high temperature in summer. After the strong El Niño in 1997, drought and high temperatures in northern China were very obvious.

The third is that the southern part of our country is prone to low temperature and floods, and in the year after the occurrence of the El Niño phenomenon, in the southern part of our country, including the Yangtze River basin and the Jiangnan region, it is prone to floods, and the severe floods that have occurred in our country in the past 100 years, such as 1931, 1954 and 1998, all occurred in the following year of the El Niño year. In 1998, El Niño was one of the most important factors influencing the devastating floods that struck our country.

Finally, in the winter after the occurrence of El Niño, the northern part of China is prone to warm winters.

La Niña andEl NiñoThe difference:

1. The nature is different.

La Niña is a condition in which the waters of the central and eastern Pacific Ocean become abnormally cold. El Niño is a warm current, an anomalous natural phenomenon in the Pacific Ocean.

2. The reasons for the formation are different.

The La Niña southeast trade winds blow the sun-scorched waters from the surface to the western Pacific Ocean, causing the western part to increase sea level by nearly 60 centimeters compared to the eastern part of the Pacific Ocean.

The eastern bottom water has turned up, causing the eastern Pacific Ocean to cool.

El Niño in South America.

On the west coast, in the eastern part of the South Pacific Ocean, from south to north flows the famous Peru.

The cold snap from November to March is the southern hemisphere.

In the summer, water temperatures in the southern hemisphere generally increase, and the westward equatorial warm current is strengthened.

3. The impact on the climate is different.

The impact of La Niña on the climate, strong cold waves and strong winds in the north are frequent, while rainfall continues to be low and temperatures remain high.

The impact of El Niño on climate is most pronounced in the circum-equatorial Pacific region. In El Niño years, Indonesia.

Australia, the South Asian subcontinent and northeastern Brazil are all dry, while rains are abundant from the equatorial central Pacific to the west coast of South America. El Niño can have devastating effects, possibly in Latin America.

Floods that led to drought in Australia and crop failures in India.

4. The time of occurrence is different.

El Niño Cycle: El Niño is a cyclical natural phenomenon that occurs approximately every 7 years. Through the study of the global climate brought, scientists believe that El Niño is not an isolated natural phenomenon, but an aspect of global climate anomalies.

In a normal year, the Pacific coast of the west coast of Peru is controlled by a cold ocean current and has a large natural fishing ground. In the event of a climate anomaly, the cold currents in the eastern Pacific are replaced by warm currents.

La Niña cycle: In the second year of an El Niño, La Niña usually occurs, and sometimes La Niña lasts for two or three years.

El Niño and La Niña are both natural phenomena of the earth, although in meteorological science, we usually define these two phenomena as "anomalous" events, but neither of these phenomena can be intervened by humans, and the only force that can form these two phenomena and complete the alternation of the two phenomena is the earth itself.

Regarding the specific manifestations of El Niño and La Niña, we will not do too much in this question, but only why the two appear alternately. Usually El Niño is always the first to occur, because El Niño is an abnormal climate phenomenon in which the trade winds cause drastic changes in the sea temperature of the eastern and western Pacific Oceans at the equator during the atmospheric circulation, resulting in a strong pressure difference.

The basis must be based on the normal circulation and trade winds of the earth, otherwise there will be no difference in sea temperature between the east and west of the Pacific Ocean. La Niña, on the other hand, is a correction of El Niño, because when El Niño occurs, the climate characteristics of the continents around the Pacific Ocean are contrary to the Earth's normal climate cycle (which can be understood as conflict), so the Earth can only recover itself once, and this self-recovery process is La Niña.

This is too general and may not be easy for most people to understand, so let's do it another way. We can compare the earth to a highway, and the meteorological cycle to a vehicle that moves in a chain, and the weather cycle on the earth under normal conditions is like a motor vehicle, driving on the highway in an orderly manner, and when the road bumps, or the driver accidentally drives the steering wheel, the vehicle will deviate.

The "offset" here can be understood as El Niño, and the "offset" must be based on the movement of the vehicle (meteorological cycle). When the vehicle deviates, the driver must correct and speed through various methods to return the vehicle to the normal path, this process of correction can be understood as La Nina, the difference is that the vehicle correction belongs to human control, and meteorological correction belongs to the natural behavior of the earth.

Of course, the earth's meteorological system itself is a very complex subject, and El Niño and La Niña are "anomalies" in the meteorological system, so the factors involved are very complex, far from being able to explain clearly in a few words.

Scientists have found that many extreme weather phenomena are related to each other and have the characteristics of nature, and the "El Niño" and "La Niña" phenomena are two large-scale, global extreme weather phenomena. We say that the phenomenon of "El Niño" and "La Niña" is the two extremes of climate change, and climate change fluctuates in between, so "El Niño" and "La Niña" always alternate, just like spring, summer, autumn and winter in nature, from cold to warm, and from warm to cold. Wu Fanxun.

Because these two phenomena will cause each other, and they have a lot to do with our destruction of the environment, they will occur alternately.

This is because the ecological environment has been severely damaged due to the impact of extreme bad weather, so such a natural phenomenon has occurred.

Because the weather is changing and the earth is rotating, some energy is often generated to alternate between these two phenomena.

La Niña and its impact on the geographical environment.

The difference between El Niño and La Niña.

Since China is located in the Northwest Pacific Ocean, both phenomena have some impact on China's coastal areas.

The difference between El Niño and La Niña.