Changes in the distribution of δ<sup>13</sup>C of deep water ΣCO<sub>2</sub> between the Last Glaciation and the Holocene

DOI Web Site Web Site 被引用文献7件

書誌事項

公開日
1988-06
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/pa003i003p00317
公開者
American Geophysical Union (AGU)

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説明

<jats:p>Carbon isotopic measurements on the benthic foraminiferal genus <jats:italic>Cibicidoides</jats:italic> document that mean deep ocean δ<jats:sup>13</jats:sup>C values were 0.46 ‰ lower during the last glacial maximum than during the Late Holocene. The geographic distribution of δ<jats:sup>13</jats:sup>C was altered by changes in the production rate of nutrient‐depleted deep water in the North Atlantic. During the Late Holocene, North Atlantic Deep Water, with high δ<jats:sup>13</jats:sup>C values and low nutrient values, can be found throughout the Atlantic Ocean, and its effects can be traced into the southern ocean where it mixes with recirculated Pacific deep water. During the glaciation, decreased production of North Atlantic Deep Water allowed southern ocean deep water to penetrate farther into the North Atlantic and across low‐latitude fracture zones into the eastern Atlantic. Mean southern ocean δ<jats:sup>13</jats:sup>C values during the glaciation are lower than both North Atlantic and Pacific δ<jats:sup>13</jats:sup>C values, suggesting that production of nutrient‐depleted water occurred in both oceans during the glaciation. Enriched <jats:sup>13</jats:sup>C values in shallow cores within the Atlantic Ocean indicate the existence of a nutrient‐depleted water mass above 2000 m in this ocean.</jats:p>

収録刊行物

  • Paleoceanography

    Paleoceanography 3 (3), 317-341, 1988-06

    American Geophysical Union (AGU)

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