What Can Antarctic Ice Tell Us About Climate History?

At first glance, the ice core cylinder drilled from beneath Antarctica appears homogeneous. However, on close observation, there appear to be faint layers. Each layer is unique and corresponds to an era in the history of our planet. Air bubbles remain intact within the layers, thus containing the earth’s atmosphere from the past era.

According to an article published in the journal Nature, the ice core cylinders obtained from Antarctica contain a record of greenhouse gases, such as carbon dioxide and methane, dating back thousands of years. In contrast to indirect climatic measurements, ice core cylinders can help measure the composition of past atmospheres accurately.

How do we read the atmosphere by using ice?

Each bubble of air contained within the ice serves as a small sample from the past. The research conducted, according to reports on EurekAlert and Phys.org, indicates that air bubbles can help scientists understand how concentrations of greenhouse gases have changed between periods of glaciation and non-glaciation.

In most cases throughout Earth’s geologic past, the concentration of CO2 was considerably smaller than the current concentration, leading to lower global temperatures. Similarly, the concentration of methane also varied based on environmental conditions. This information helps scientists create an understanding of climate systems in more detail.

These records indeed matter today

A knowledge of past climates will allow us to better understand current climatic events. It has been found that information obtained through ice core samples helps in predicting the future performance of our climate system in the face of continuing global warming.

Moreover, scientists have also noted the importance of ice in Antarctica in regulating ocean currents and their impact on global climate. In essence, ice cores not only reflect past climates but are also used in forecasting future events.