AI Article Synopsis
- The last interglacial (LIG) period, occurring around 130,000 to 118,000 years ago, saw global sea levels rise significantly higher than today, with Antarctic Ice Sheet (AIS) reductions playing a key role.
- Despite contributions from the Greenland Ice Sheet (GrIS), they alone can't fully explain the elevated sea levels, indicating that the AIS must have undergone substantial changes.
- New data reveals that during the LIG, there was a highstand linked to AIS between 129.5-125 thousand years ago, followed by a lowstand and later contributions from both AIS and GrIS highlighting a complex interaction that could provide insights into future sea-level rise scenarios.
Article Abstract
The last interglacial (LIG; ~130 to ~118 thousand years ago, ka) was the last time global sea level rose well above the present level. Greenland Ice Sheet (GrIS) contributions were insufficient to explain the highstand, so that substantial Antarctic Ice Sheet (AIS) reduction is implied. However, the nature and drivers of GrIS and AIS reductions remain enigmatic, even though they may be critical for understanding future sea-level rise. Here we complement existing records with new data, and reveal that the LIG contained an AIS-derived highstand from ~129.5 to ~125 ka, a lowstand centred on 125-124 ka, and joint AIS + GrIS contributions from ~123.5 to ~118 ka. Moreover, a dual substructure within the first highstand suggests temporal variability in the AIS contributions. Implied rates of sea-level rise are high (up to several meters per century; m c), and lend credibility to high rates inferred by ice modelling under certain ice-shelf instability parameterisations.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6834665 | PMC |
| http://dx.doi.org/10.1038/s41467-019-12874-3 | DOI Listing |
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