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Geologist connects regular changes of Earth's orbital cycle to changes in climate

Date:
April 6, 2010
Source:
University of California - Santa Barbara
Summary:
In an analysis of the past 1.2 million years, a geologist examining ocean sediment cores has discovered a pattern that connects the regular changes of Earth's orbital cycle to changes in the Earth's climate.

New ocean sediment core research reveals a pattern that connects the regular changes of Earth's orbital cycle to changes in the Earth's climate.
Credit: iStockphoto/Duncan Walker

In an analysis of the past 1.2 million years, UC Santa Barbara geologist Lorraine Lisiecki discovered a pattern that connects the regular changes of Earth's orbital cycle to changes in Earth's climate.

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The finding is reported in the scientific journal Nature Geoscience.

Lisiecki performed her analysis of climate by examining ocean sediment cores. These cores come from 57 locations around the world. By analyzing sediments, scientists are able to chart Earth's climate for millions of years in the past. Lisiecki's contribution is the linking of the climate record to the history of Earth's orbit.

It is known that Earth's orbit around the sun changes shape every 100,000 years. The orbit becomes either more round or more elliptical at these intervals. The shape of the orbit is known as its "eccentricity." A related aspect is the 41,000-year cycle in the tilt of Earth's axis.

Glaciation of Earth also occurs every 100,000 years. Lisiecki found that the timing of changes in climate and eccentricity coincided. "The clear correlation between the timing of the change in orbit and the change in the Earth's climate is strong evidence of a link between the two," said Lisiecki. "It is unlikely that these events would not be related to one another."

Besides finding a link between change in the shape of the orbit and the onset of glaciation, Lisiecki found a surprising correlation. She discovered that the largest glacial cycles occurred during the weakest changes in the eccentricity of Earth's orbit -- and vice versa. She found that the stronger changes in Earth's orbit correlated to weaker changes in climate. "This may mean that the Earth's climate has internal instability in addition to sensitivity to changes in the orbit," said Lisiecki.

She concludes that the pattern of climate change over the past million years likely involves complicated interactions between different parts of the climate system, as well as three different orbital systems. The first two orbital systems are the orbit's eccentricity, and tilt. The third is "precession," or a change in the orientation of the rotation axis.


Story Source:

The above story is based on materials provided by University of California - Santa Barbara. Note: Materials may be edited for content and length.


Journal Reference:

  1. Lorraine E. Lisiecki. Links between eccentricity forcing and the 100,000-year glacial cycle. Nature Geoscience, 2010; DOI: 10.1038/ngeo828

Cite This Page:

University of California - Santa Barbara. "Geologist connects regular changes of Earth's orbital cycle to changes in climate." ScienceDaily. ScienceDaily, 6 April 2010. <www.sciencedaily.com/releases/2010/04/100406133707.htm>.
University of California - Santa Barbara. (2010, April 6). Geologist connects regular changes of Earth's orbital cycle to changes in climate. ScienceDaily. Retrieved November 23, 2014 from www.sciencedaily.com/releases/2010/04/100406133707.htm
University of California - Santa Barbara. "Geologist connects regular changes of Earth's orbital cycle to changes in climate." ScienceDaily. www.sciencedaily.com/releases/2010/04/100406133707.htm (accessed November 23, 2014).

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