New hypothesis for changes in deep-water circulation in the Southern Ocean
This study examines changes in deep-water circulation in the Southern Ocean between the last glacial maximum and today, specifically changes in circulation associated with Drake Passage, the deep-water channel between Cape Horn and the South Shetland Islands that connected the Pacific and Atlantic oceans. To support their hypothesis, the authors present two transects of high-resolution stable-isotope records obtained from the southwest Pacific and the southwest Atlantic. They suggest that changes caused by the “deep gateway effect” of the Drake Passage resulted in glacial-to-interglacial changes of deep water sources of the Southern Ocean below 2500 meters during the last glaciation. This adds to our understanding of the last episode of major climate change.
- Article Category
- Research Articles
Enhanced δ13C and δ18O Differences Between the South Atlantic and South Pacific During the Last Glaciation: The Deep Gateway Hypothesis
- First Published:
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- New hypothesis for changes in deep-water circulation in the Southern Ocean
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Eos.org: Earth & Space Science News
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