La Niña
La Niña is also a Spangish word meaning "The Little Girl". It is also a per se oceanic stream. La Niña produces the opposite effect of Alnino, due to which it was formerly called Anti-Alnino G. During La Niña Cold water buoyancy intensifies in the eastern tropical Pacific. During the La Niña period, the sea surface temperature (SST) of the equatorial eastern Pacific Ocean decreases to 3–5 ° C above normal.
It takes effect in the western Pacific Ocean while El Niño in the eastern Pacific Ocean ceases. Scientists believe that La Niña replaces the drought conditions generated by El Niño in the western Pacific Ocean with humid weather. With the emergence of La Nina, the increase in temperature in the tropical part of the western Pacific Ocean leads to greater evaporation in Indonesia and adjoining areas due to higher evaporation. The ascending and descending branches of walker transmission become more sophisticated and distinct during La Nina.
Effects of la nina
- Africa- Due to the influence of La Nina, there are more humid conditions in southern Africa from December to February, and equatorial East Africa has a drier state than normal during the same period.
- Asia - Tropical cyclones that form along the subtropical ridge during La Niña migrate westward to the western Pacific Ocean. This displacement of cyclones increases the risk of landslides in China. La Niña generally has a positive impact on the South Asian monsoon, as the Indian Ocean loop of the Walker Cell becomes stronger due to La Niña. In 1998, heavy flooding occurred in China, India and Bangladesh as La Nina received more water than normal.
- South America - At the time of La Niña, drought conditions occur in the coastal areas of Peru and Chile.
- North America - La Nina mostly has the opposite effect of El Nina. Northern California, the Northern Rocky Mountains, etc. have higher-than-average rainfall. Cyclones in the Atlantic Ocean increase and impact in the Pacific.
El Nino Modoki and La Nina Modoki
Like El Niño, El Niño Modoki (Modoki in Japanese means' similar, but different) is a coupled ocean-atmosphere phenomenon in the tropical Pacific. El Niño is characterized by anomalous heating of the eastern equatorial Pacific region. El Niño Modocí, on the other hand, is associated with the anomalous heating of the central tropical Pacific and the cooling of the eastern and western tropical regions.
La Nina Modoki is associated with low oceanic surface temperatures (SST) of the central tropical Pacific Ocean while the eastern and western tropical Pacific regions are relatively warm. It consists of two walker cells. First, the ascending edge at both ends of the tropical Pacific and the second, the descending edge of both cells on the central equatorial Pacific.
Both El Niño Modoki and La Niña Modoki form ENSO Modoki. Several studies have shown that ENSO modoki has become more effective than ENSO in recent times.
Both El Niño Modoki and La Niña Modoki form ENSO Modoki. Several studies have shown that ENSO modoki has become more effective than ENSO in recent times.
El Nino Modoki has its own distinct pattern and is affecting many parts of the world. For example, the west coastal region of the United States receives more rainfall during El Niño but the region becomes dry during El Niño Modocci.
Rainfall in India and South Africa is also being affected due to ENSO Modoki. El Niño reduces the formation of cyclones in the Arabian Sea. Whereas El Niño Modoki has caused more cyclones to form in the Arabian Sea than in the normal situation for some years. At the time of El Niño Modoki, a descending branch of the walker cell is located in the Bay of Bengal, causing drought conditions in the region. As a result, cyclones do not form in this region. On the other hand, a large amount of winds converge on the Arabian Sea at the time of El Niño Modoki, due to which a large number of cyclones form in this region.
Rainfall in India and South Africa is also being affected due to ENSO Modoki. El Niño reduces the formation of cyclones in the Arabian Sea. Whereas El Niño Modoki has caused more cyclones to form in the Arabian Sea than in the normal situation for some years. At the time of El Niño Modoki, a descending branch of the walker cell is located in the Bay of Bengal, causing drought conditions in the region. As a result, cyclones do not form in this region. On the other hand, a large amount of winds converge on the Arabian Sea at the time of El Niño Modoki, due to which a large number of cyclones form in this region.
