Global reorganization of deep-sea circulation and carbon storage after the last ice age.

Global reorganization of deep-sea circulation and carbon storage after the last ice age.
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DOI:
10.1126/sciadv.abq5434
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发表时间:
2022-11-18
期刊:
影响因子:
13.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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利用新的和已发表的海洋化石放射性碳(14C/C)测量值(一种对环流和海气交换非常敏感的示踪剂),我们建立了自上一个冰河时代以来大西洋、南部和太平洋深海环流和通风的几个基准。我们发现,在太平洋冰川底部深处,而不是像今天这样的中部深处,最缺乏14c的水,这最好的解释是,除了“翻转”的太平洋冰川倾覆结构外,冰川深海倾覆的速度也在放缓。这些观测结果不能仅仅由海气交换的变化产生,它们强调了在浩瀚的太平洋深渊中,冰川深海碳储存和伴随的大气二氧化碳减少的翻转环流变化的主要作用。放射性碳测量的汇编被用来描述自上一个冰河时代以来深海倾覆的特征。
Using new and published marine fossil radiocarbon (14C/C) measurements, a tracer uniquely sensitive to circulation and air-sea gas exchange, we establish several benchmarks for Atlantic, Southern, and Pacific deep-sea circulation and ventilation since the last ice age. We find the most 14C-depleted water in glacial Pacific bottom depths, rather than the mid-depths as they are today, which is best explained by a slowdown in glacial deep-sea overturning in addition to a “flipped” glacial Pacific overturning configuration. These observations cannot be produced by changes in air-sea gas exchange alone, and they underscore the major role for changes in the overturning circulation for glacial deep-sea carbon storage in the vast Pacific abyss and the concomitant drawdown of atmospheric CO2. A compilation of radiocarbon measurements is used to characterize deep-sea overturning since the last ice age.
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