[ad_1]
More than 100,000 years ago, the global level of the seas rose from 6 to 9 meters, almost half that of melting Greenland ice sheets. current state of our rapidly changing climate.
Using marine and terrestrial geological records, researchers have created a chronology of climatic conditions, century by century, over the last 100,000 years. These showed that after an early period of maximum warming, some centuries during the last interglacial (between 129,000 and 116,000 years ago) were much warmer than others, resulting in waves of drought and cold water spreading in the North Atlantic. This has led to a relatively unstable climate characterized by "abrupt" changes in ocean currents, precipitation and melting ice.
For the study, published in Nature Communications, The researchers took samples of ice cores from Greenland and compared them with samples of deep-sea sediments taken from the Portuguese margin and mineral deposits found in a cave in Italy. Together, these samples revealed that some centuries have experienced faster sediment accumulation than others, indicating periods of increased ice flow due to a drier, warmer climate.
"We know from independent evidence that some of Greenland's icecap melted during the LIG, thus contributing to the average global sea level higher than the present," IFLScience said. lead author, Chronis Tzedakis, of University College London.
Based on these climate model experiments, Tzedakis suggests that melting ice and runoff from Greenland could have contributed to weakening the circulation of the Atlantic South (AMOC), ultimately creating a cooling effect in the Atlantic North and an arid climate in Southern Europe.
[ad_2]
Source link
