Journal Highlights

New hypothesis for changes in deep-water circulation in the Southern Ocean

Editor’s Highlight—

 

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. 

-- 10.1002/2017PA003118,