Earth's orbit tied with climate changes
Santa Barbara, Calif. (UPI) Apr 6, 2010
A U.S. geologist says she's discovered a pattern that connects regular changes in the Earth's orbital cycle to changes in the planet's climate.
University of California-Santa Barbara Assistant Professor Lorraine Lisiecki performed her analysis of climate by examining ocean sediment cores taken from 57 locations around the world and linking that climate record to the history of the Earth's orbit.
The researchers said it's known the Earth's orbit around the sun changes shape every 100,000 years, becoming either more round or more elliptical. The shape of the orbit is known as its "eccentricity" and a related aspect is the 41,000-year cycle in the tilt of the Earth's axis.
Glaciation of the Earth also occurs every 100,000 years and Lisiecki found 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," Lisiecki said. She also said she discovered the largest glacial cycles occurred during the weakest changes in the eccentricity of Earth's orbit -- and vice versa, with the stronger changes in orbit correlating 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," she said.
The research is reported in the journal Nature Geoscience.
Share This Article With Planet Earth
Climate Science News - Modeling, Mitigation Adaptation
London (UPI) Apr 02, 2010
A plan to find a permanent home for U.N. climate meetings could result in more work getting done and a reduction in travel emissions, British officials said. The proposal, supported by Britain, would designate a permanent home for the Conferences of the Parties of the United Nations Framework Convention on Climate Change. The plan would create a permanent governing council and ap ... read more
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2010 - SpaceDaily. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement|