We’ve long known that the Moon affects the tides, but it now transpires that another great celestial force is playing games with the world’s oceans. Scientists have discovered a secret connection between the orbits of Earth and Mars, and found that this cosmic duet plays an important part in global warming.
Researchers have found that every 2.4 million years, the interaction between Earth and Mars results in key changes to deep ocean currents, which are linked to periods of increased solar energy and a warmer climate. The study, published in the journal Nature Communications, analyzed deep-sea sedimentary data to uncover these cycles.
The study's lead author expressed surprise at finding these 2.4-million-year cycles in the sedimentary data and attributed them to the interactions of Mars and Earth orbiting the Sun. By examining over half a century of scientific drilling data from various sites worldwide, researchers were able to establish a connection between sedimentary shifts and changes in Earth's orbit.
The alignment of Earth and Mars' orbits creates 'astronomical grand cycles' that influence planetary eccentricity, leading to cycles of higher solar radiation and warmer climates occurring every 2.4 million years. These cycles have been linked to stronger deep ocean circulation and periods of warmer climate throughout Earth's history.
The research challenges the theory that a warming climate would result in a more stagnant deep ocean, suggesting that warmer oceans actually have more vigorous deep circulation. This finding could potentially make oceans more resilient to climate change impacts, although it does not negate the threat posed by human-induced global warming.
The study's authors hope that their results will contribute to the development of more accurate climate models to better prepare for the uncertainties of the future. While the 2.4-million-year cycles are not directly linked to current global warming caused by human activities, understanding these natural climate cycles can provide valuable insights for addressing climate change challenges.
