Climate pattern

A climate pattern is any recurring characteristic of the climate. Climate patterns can last tens of thousands of years, like the glacial and interglacial periods within ice ages, or repeat each year, like monsoons.

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Main article: Climate oscillation

A mode of variability is a climate pattern with identifiable characteristics, specific regional effects, and often oscillatory behavior. Many modes of variability are used by climatologists as indices to represent the general climatic state of a region affected by a given climate pattern.

Measured via an empirical orthogonal function analysis, the mode of variability with the greatest effect on climates worldwide is the seasonal cycle, followed by El Niño-Southern Oscillation, followed by thermohaline circulation.

Other well-known modes of variability include:

• The Antarctic oscillation
• The Arctic oscillation
• The Atlantic multidecadal oscillation
• The Indian Ocean Dipole
• The Madden–Julian oscillation
• The North Atlantic oscillation
• The Pacific decadal oscillation
• The Pacific-North American teleconnection pattern
• The Quasi-biennial oscillation

See also

• Climate change
• Global warming
• Teleconnection

Further reading

• Natural climate variability at the National Institute of Geophysics and Vulcanology (Bologna, Italy)