New Climate Model Explains Ice-Age Variability
International team reveals a mechanism to explain pronounced climate variability during the last ice age.
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In order to support these findings of the models, the scientists investigated the sea-surface temperatures for that time period. “To do this, we compiled and analyzed all of the high-resolution reconstructions from marine sediments of the North Atlantic," says Dr. Lukas Jonkers, co-author of the study and micropaleontologist at MARUM. “High-resolution here means that the data points of a series average no more than 200 years apart, with no single step greater than 1000 years.” The paleoarchives studied provide evidence for recurring temperature oscillations in the surface waters every 150 to 1000 years during the last glacial maximum, which is consistent with the modelled multi-centennial climate variability with internal forcing mechanisms.
The importance of understanding feedback processes
Recent research findings underscore the importance of detailed study and understanding of feedback processes in the climate system. Matthias Prange emphasizes the need for a deeper understanding of climate variability at various time scales, as this could have ramifications for future climate change that could lead to unexpected and undesirable surprises for societies. These findings are also incorporated into the work of the Cluster of Excellence "The Ocean Floor – Earth’s Uncharted Interface", which is based at MARUM.
Reference: Prange M, Jonkers L, Merkel U, Schulz M, Bakker P. A multicentennial mode of North Atlantic climate variability throughout the Last Glacial Maximum. Sci Adv. 2023;9(44):eadh1106. doi: 10.1126/sciadv.adh1106
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