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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >The release of ~(14)C-depleted carbon from the deep ocean during the last deglaciation: Evidence from the Arabian Sea
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The release of ~(14)C-depleted carbon from the deep ocean during the last deglaciation: Evidence from the Arabian Sea

机译：最后一次冰消期间深海中〜（14）C贫化碳的释放：来自阿拉伯海的证据

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摘要

During the last deglaciation the concentration of CO_2 in the atmosphere increased and the radiocarbon activity ({increment}~(14)C) of the atmosphere declined in two steps corresponding in timing to Heinrich Stadial 1 and the Younger Dryas. These changes have been attributed to the redistribution of ~(14)C-depleted carbon from the deep ocean into the upper ocean and atmosphere. Recently, reconstructions of {increment}~(14)C in intermediate waters of the eastern tropical Pacific have revealed pulses of very old water during the deglaciation, consistent with the release of ~(14)C-depleted carbon from the deep ocean at this time. Here, we present reconstructions of intermediate water {increment}~(14)C from the northern Arabian Sea near the coast of Oman. These reconstructions record significant aging of intermediate waters in the Arabian Sea during Heinrich Stadial 1 and, to a lesser extent, during the Younger Dryas. The timing and magnitude of ~(14)C depletion in the Arabian Sea during Heinrich Stadial 1 is very similar to that previously observed in the eastern North Pacific near Baja California, indicating that similar mechanisms were involved in controlling {increment}~(14)C at these two sites. The most parsimonious explanation of the {increment}~(14)C records from the Arabian Sea and Baja California remains the release of ~(14)C-depleted carbon from the deep ocean by renewal of upwelling and mixing in the Southern Ocean. These ~(14)C-depleted waters would have been incorporated into thermocline and intermediate water masses formed in the Southern Ocean and spread northward into the Pacific, Indian and Atlantic Ocean basins.
机译：在最后一次冰消期间，大气中的CO_2浓度增加，大气中的放射性碳活度（{increment}〜（14）C）分两步下降，这与Heinrich Stadial 1和Younger Dryas的时间相对应。这些变化归因于〜（14）C耗尽的碳从深海到上层海洋和大气的重新分布。最近，热带东部太平洋中层水域{increment}〜（14）C的重建显示出在冰消融化过程中出现了非常老的水脉冲，这与深海中〜（14）C耗尽的碳的释放是一致的。时间。在这里，我们介绍了从阿拉伯海北部靠近阿曼海岸的中间水{increment}〜（14）C的重建过程。这些重建记录表明，在海因里希（Heinrich）标准体育场1时期，阿拉伯海中间水域显着老化，在较小的程度上，在年轻树妖（Younger Dryas）期间。 Heinrich Stadial 1期间阿拉伯海〜（14）C耗竭的时间和强度与先前在北下加利福尼亚州附近的北太平洋东部观测到的时间和强度非常相似，表明类似的机制参与了{{}}〜（14）的控制。在这两个站点C。来自阿拉伯海和下加利福尼亚州的{increment}〜（14）C记录的最简约解释仍然是通过更新南海的上升流和混合使深海中的〜（14）C贫乏碳释放。这些〜（14）C枯竭的水将被合并到在南大洋形成的温跃层和中间水团中，并向北扩散到太平洋，印度洋和大西洋海盆。

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