Antarctica's Gravity Anomaly Linked to Deep Mantle Movements Over 70 Million Years
Researchers have traced the origins of Antarctica's gravity anomaly to deep mantle movements over the past 70 million years, coinciding with the continent's glaciation.
Scientists have identified the cause of Earth's most significant gravitational anomaly, located beneath Antarctica, attributing it to deep mantle movements over the past 70 million years. This finding coincides with the period when Antarctica transitioned from a warmer climate to its current ice-covered state.
The research team utilized seismic waves from global earthquakes to create a three-dimensional map of Earth's interior, similar to a medical CT scan. This approach allowed them to observe density variations deep within the planet. Their models closely matched satellite-based gravity measurements, confirming the accuracy of their reconstruction.
By simulating Earth's geological history, the scientists discovered that the Antarctic gravity anomaly was weaker between 70 and 50 million years ago. It then intensified rapidly between 50 and 30 million years ago, aligning with the formation of Antarctica's extensive ice sheets. While the study does not establish a direct causal relationship, the overlapping timelines suggest a potential connection between deep Earth processes and surface climate changes.
The researchers aim to further investigate whether these gravitational changes directly influenced the growth of Antarctic ice. Understanding the interplay between Earth's interior dynamics and surface climate is crucial for predicting the long-term stability of ice sheets and their impact on global sea levels.