The southern oscillation was discovered by sir gilbert walker early in the 20th century? a. is a seasaw variation in air pressure across the tropical indian and pacific oceans. b. is linked to the development of el niño. c all of these are correct. d. none of these is correct.

All of these are correct.

Explanation:

The pressure increase in the western Pacific was then related to the warming of the waters of the eastern Pacific (El Niño event), the atmospheric pressure rises in the western Pacific and falls in the east. This pressure drop is accompanied by a weakening of the east winds. The relationship between the Southern Oscillation with "El Niño" is called "El Niño-Southern Oscillation" or ENSO (in English ENSO, El Niño-Southern Oscillation). Sallie Baliunas says, "El Niño is part of an ocean-air change system called" Southern Oscillation-El Niño ", where the" La Niña "phase tends to cool down.

The strength of the Southern Oscillation is measured by the Southern Oscillation Index (SOI), which are the differences in standardized surface atmospheric pressures between Darwin (Australia) and Tahiti (French Polynesia) in the Central Pacific. The advantage of measuring between these locations is that there is a complete record from 1876 to date.

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