Climate oscillation

Climate oscillation

A climate oscillation is any oscillation within global or regional climate. These fluctuations in atmospheric temperature, sea surface temperature, precipitation or other parameters can be quasi-periodic, often occurring on inter-annual, multi-annual, decadal, multidecadal, century-wide, millennial or longer timescales. A prominent example is the El Niño-Southern Oscillation, involving sea surface temperatures along a strech of the equatorial Central and East Pacific Ocean and the western coast of tropical South America, but which affects climate worldwide.

Contents

Origins and causes

There are close correlations between Earth's climate oscillations and astronomical factors (barycenter changes, solar variation, cosmic ray flux, Milankovic cycles), and modes of heat distribution between the ocean-atmosphere climate system. In some cases, current, historical and paleoclimatological natural oscillations may be masked by significant volcanic eruptions, impact events, irregularities in climate proxy data, positive feedback processes or anthropogenic emissions of substances such as greenhouse gases.[1][2]

Effects

Extreme phases of short-term climate oscillations such as ENSO can result in characteristic patterns of floods and droughts, monsoonal disruption and extreme temperatures in the form of heat waves and cold waves. Shorter-term climate oscillations typically do not directly result in climate change. However, the effects of underlying climate trends such as recent global warming and oscillations can be cumulative to global temperature, producing shorter-term fluctuations in the instrumental and satellite temperature records.

References

  1. ^ Scafetta, Nicola (May 15, 2010). "Empirical evidence for a celestial origin of the climate oscillations". Journal of Atmospheric and Solar-Terrestrial Physics 72: 951–970. doi:10.1016/j.jastp.2010.04.015. http://www.fel.duke.edu/~scafetta/pdf/scafetta-JSTP2.pdf. Retrieved 20 July 2011. 
  2. ^ Curry, Judith. "Scafetta on climate oscillations". WordPress. Climate Etc.. http://judithcurry.com/2011/04/14/scafetta-on-climate-oscillations/. Retrieved 20 July 2011. 

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