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Updated: Jun 1, 2025

The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations

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Published on: August 3, 2016

冰川南大洋深水 Nd同位素组成由盆地修饰主导

Moritz Hallmaier^1,2, Eva M Rückert^3,4, Yugeng Chen⁵

¹Institute of Environmental Physics, Heidelberg University, Im Neuenheimer Feld 229, 69120, Heidelberg, Germany. mhallmaier@geomar.de.

Scientific reports

|January 20, 2025

概括

南大洋的循环影响二氧化碳的储存. 冰川时期显示盆地流量增加,而不是太平洋水的入侵,影响深海碳储存,并需要重新评估南半球水质来源.

科学领域:

海洋学海洋学海洋学
古气候学古气候学
地质化学地质化学

背景情况:

深南大洋的循环对于通过深水质量再分配来调节大气二氧化碳至关重要.
了解水质的起源和混合是重建过去气候动态和碳循环的关键.
之前的研究表明,在降低大西洋南部翻转循环 (AMOC) 的冰川时期,南洋的太平洋深水影响增加.

研究的目的:

调查过去15万年来南大洋大西洋部门的深水质量分布.
为了测试在冰川时期太平洋深水影响增加的假设.
了解深海碳储存的驱动因素.

主要方法:

在两个南大洋地点 (PS 1768-8和ODP 1093) 的沉积物核心中分析了authigenicneodymium同位素比率 (ɛNd).
考古海洋学数据与海洋循环模型的结果进行比较.
解释eNd签名以推断水质来源和混合.

主要成果:

冰河间时期显示非放射性 ɛNd 标志,与当今的韦德尔海来源的南极地底水 (AABW) 一致.
冰川时期表现出高度辐射的 Nd 值,这表明不同的水质影响.
海洋循环建模表明,冰川期间太平洋水的影响没有显著增加.

结论:

由南极环极电流 (ACC) 强度调节的底流量增加,可能解释了放射性冰川的印记.
层级化和缓慢的冰川深水限制了垂直混合,增强了冰川的碳储存,没有太平洋水的入侵.
南半球的冰川和终端需要重新评估,以便在大西洋地区准确地进行古海洋学重建.

关键词:

岩流动 (Benthic Flux) 是一种流动方式.碳储存是碳的储存方式.的同位素是的同位素.海洋循环海洋循环南大洋南大洋是南大洋.

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