A Southern Ocean trigger for Northwest Pacific ventilation during the Holocene?

A Southern Ocean trigger for Northwest Pacific ventilation during the Holocene?
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DOI:
10.1038/srep04046
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发表时间:
2014-02-17
期刊:
影响因子:
4.6
通讯作者:
Uchida M
Uchida M
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Rella SF;Uchida M

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由于具有亚千禧年尺度分辨率的可确定日期的海洋档案稀少,人们对全新世海洋环流知之甚少。在这里,我们提供了过去 12,000 年西北 (NW) 太平洋中深度水放射性碳含量的记录,该记录显示了相对于大气放射性碳库存变化的显着的千禧年尺度变化。这些变化与区域通风和混合过程的明显脱钩使我们得出这样的结论:西北太平洋中深度可能对南大洋的纬度位移所造成的南大洋翻转的变化做出了反应。由此推断,北大西洋和南大洋同步翻转的趋势将不利于全新世稳定两极跷跷板制度的发展。
Holocene ocean circulation is poorly understood due to sparsity of dateable marine archives with submillennial-scale resolution. Here we present a record of mid-depth water radiocarbon contents in the Northwest (NW) Pacific Ocean over the last 12.000 years, which shows remarkable millennial-scale variations relative to changes in atmospheric radiocarbon inventory. Apparent decoupling of these variations from regional ventilation and mixing processes leads us to the suggestion that the mid-depth NW Pacific may have responded to changes in Southern Ocean overturning forced by latitudinal displacements of the southern westerly winds. By inference, a tendency of in-phase related North Atlantic and Southern Ocean overturning would argue against the development of a steady bipolar seesaw regime during the Holocene.
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