Mars-caused changes in Earth’s orbit impacts ocean currents and temperatures every 2.4 million years and is known as an “astronomical grand cycle.”Geological evidence tracing back more than 65 million years and taken from hundreds of sites across the world suggests that deep-sea currents have repeatedly gone through periods of being either stronger or weaker. This happens every 2.4 million years and is known as an “astronomical grand cycle.
“The gravity fields of the planets in the solar system interfere with each other and this interaction, called a resonance, changes planetary eccentricity, a measure of how close to circular their orbits are,” study co-author Dietmar Müller, a professor of geophysics at the University of Sydney, said in a statement.
The team’s findings indicate that the circular movement of water causing small whirlpools, or “eddies,” in the oceans’ depths was an important factor in the warming seas. “The freezing and melting of sea ice is not the only mechanism influencing deep ocean circulation. Deep-ocean eddies are predicted to intensify in a warming, more energetic climate system as major storms become more frequent,” Müller said.