Deglacial changes in the strength of deep southern component water and sediment supply at the Argentine continental margin

Deglacial changes in the strength of deep southern component water and sediment supply at the Argentine continental margin
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阿根廷大陆边缘南部深层水和沉积物供应强度的冰消变化

DOI:
10.1002/2016pa003079
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
Lantzsch
Lantzsch
中科院分区:
地学2区
文献类型:
--
作者:
Warratz;Henrich;Chiessi;Lantzsch

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南方深层水(SCW)是全球海洋环流的重要组成部分,由下绕极深水(LCDW)和南极底层水(AABW)组成。有人认为,在上一次冰期/间冰期循环期间,大西洋深层水团结构发生了显著变化。然而,深层的南海水源地-近源记录仍然稀少。本文介绍了阿根廷大陆深部边缘的三个相关的深部SCW古流记录,揭示了自末次冰盛期(LGM)以来西南大西洋的深水环流和深部SCW流动强度。基于可分选粉砂值的增加,我们提出了相对于早期去冰期/LGM和全新世,从14到10卡的深部SCW流动强度增强。我们认为,由于深部SCW扩散在垂直方向上变窄,同时占据我们核心位置的高能LCDW/AABW界面的迁移,深部北部分量水(NCW)对深部SCW流动强度有直接影响。我们建议在13a ka B.P.之前为浅滩的NCW提供空间,从而为深层的SCW扩散提供空间,从而导致我们核心地点的碳酸盐保存减少。13Gcal ka和B.P.碳酸盐含量的增加表明NCW扩大了,改变了我们在西南大西洋深处的核心地点的深水性质。然而,来自南方的陆源沉积物继续沉积在我们的核心地点,这表明自末次盛冰期以来,阿根廷大陆边缘没有中断过深的SCW流动。
The deep southern component water (SCW), comprising Lower Circumpolar Deep Water (LCDW) and Antarctic Bottom Water (AABW), is a major component of the global oceanic circulation. It has been suggested that the deep Atlantic water mass structure changed significantly during the last glacial/interglacial cycle. However, deep SCW source‐proximal records remain sparse. Here we present three coherent deep SCW paleocurrent records from the deep Argentine continental margin shedding light on deep water circulation and deep SCW flow strength in the Southwest Atlantic since the Last Glacial Maximum (LGM). Based on increased sortable silt values, we propose enhanced deep SCW flow strength from 14 to 10 cal ka B.P. relative to the early deglacial/LGM and the Holocene. We propose a direct influence of deep northern component water (NCW) on deep SCW flow strength due to vertical narrowing of deep SCW spreading, concurrent with a migration of the high‐energetic LCDW/AABW interface occupying our core sites. We suggest a shoaled NCW until 13 cal ka B.P., thereby providing space for deep SCW spreading that resulted in reduced carbonate preservation at our core sites. Increased carbonate content from 13 cal ka B.P. indicates that the NCW expanded changing deep water properties at our core sites in the deep Southwest Atlantic. However, southern sourced terrigenous sediments continued to be deposited at our core sites, suggesting that deep SCW flow was uninterrupted along the Argentine continental margin since the LGM.
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