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Synchronized Chaos: Mechanisms For Major Climate Shifts

Date:
August 2, 2007
Source:
American Geophysical Union
Summary:
In the mid-1970s, a climate shift cooled sea surface temperatures in the central Pacific Ocean and warmed the coast of western North America, bringing long-range changes to the northern hemisphere. After this climate shift waned, an era of frequent El Ninos and rising global temperatures began.

In the mid-1970s, a climate shift cooled sea surface temperatures in the central Pacific Ocean and warmed the coast of western North America, bringing long-range changes to the northern hemisphere.

After this climate shift waned, an era of frequent El Ninos and rising global temperatures began.

Understanding the mechanisms driving such climate variability is difficult because unraveling causal connections that lead to chaotic climate behavior is complicated.

To simplify this, Tsonis et al. investigate the collective behavior of known climate cycles such as the Pacific Decadal Oscillation, the North Atlantic Oscillation, the El Nino/Southern Oscillation, and the North Pacific Oscillation.

By studying the last 100 years of these cycles' patterns, they find that the systems synchronized several times.

Further, in cases where the synchronous state was followed by an increase in the coupling strength among the cycles, the synchronous state was destroyed. Then. a new climate state emerged, associated with global temperature changes and El Nino/Southern Oscillation variability.

The authors show that this mechanism explains all global temperature tendency changes and El Nino variability in the 20th century.

Title: A new dynamical mechanism for major climate shifts

Authors: Anastasios A. Tsonis, Kyle Swanson, and Sergey Kravtsov: Atmospheric Sciences Group, Department of Mathematical Sciences, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, U.S.A.

Source: Geophysical Research Letters (GRL) paper 10.1029/2007GL030288, 2007


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The above story is based on materials provided by American Geophysical Union. Note: Materials may be edited for content and length.


Cite This Page:

American Geophysical Union. "Synchronized Chaos: Mechanisms For Major Climate Shifts." ScienceDaily. ScienceDaily, 2 August 2007. <www.sciencedaily.com/releases/2007/08/070801175711.htm>.
American Geophysical Union. (2007, August 2). Synchronized Chaos: Mechanisms For Major Climate Shifts. ScienceDaily. Retrieved July 22, 2014 from www.sciencedaily.com/releases/2007/08/070801175711.htm
American Geophysical Union. "Synchronized Chaos: Mechanisms For Major Climate Shifts." ScienceDaily. www.sciencedaily.com/releases/2007/08/070801175711.htm (accessed July 22, 2014).

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