Could deep subantarctic convection feed the world deep basins during the Last Glacial Maximum?
International audience Simple box model calculations are used to simulate the oceanic circulation during the last glacial maximum (LGM). These experiments show that the main features of the 1513C and A14C distributions and of the lysocline depth may be explained by a circulation pattern very differe...
Published in: | Paleoceanography |
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Main Authors: | , , , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
1995
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Subjects: | |
Online Access: | https://hal.science/hal-02913417 https://hal.science/hal-02913417/document https://hal.science/hal-02913417/file/ark%20_67375_WNG-DR09514G-H.pdf https://doi.org/10.1029/95PA00978 |
Summary: | International audience Simple box model calculations are used to simulate the oceanic circulation during the last glacial maximum (LGM). These experiments show that the main features of the 1513C and A14C distributions and of the lysocline depth may be explained by a circulation pattern very different from the modem one. Intermediate and upper deep waters were produced in the North Atlantic Ocean, whereas deep waters of Subantarctic Mode type, forming at the northern edge of the Subantarctic convergence, invaded the main oceanic basins. The Southern Ocean, mainly self ventilated, had a reduced deep component that flew southward along the East Pacific Ridge and the Australian west cost. The thermodynamic fractionation that occurs during air-sea exchange has only contributed slightly to the glacial deep 1513C distribution through surface water temperature variations. |
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