Oceans Vented Carbon Dioxide During the Last Deglaciation

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https://eos.org/research-spotlights/oceans-vented-carbon-dioxide-during-the-last-deglaciation

Source:   By  Kate Wheeling, Eos/AGU.

Excerpt: A new boron isotope record from South Pacific marine sediments offers a more complete picture of ocean-atmosphere carbon dioxide exchange during the late Pleistocene. During the late Pleistocene epoch, ice sheets advanced and retreated in tandem with changing atmospheric carbon dioxide levels. Researchers have long sought to understand the complex processes that modulate rising and falling carbon dioxide concentrations—a line of research with important implications today as levels reach highs not seen since roughly 3 million years ago in the Pliocene, when the Arctic was forested. ... The authors ...found widespread outgassing of carbon dioxide, particularly during the last deglaciation, which could be explained by an increase in upwelling of the gas from the deep ocean, according to the authors. ...The study fills an important gap in boron isotope–based reconstructions of the ocean-atmosphere carbon dioxide exchange throughout the last deglaciation. A better understanding of this exchange in the past could provide insights about impacts that rising atmospheric carbon dioxide levels will have on the climate today....

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