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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 >Deep sea corals off Brazil verify a poorly ventilated Southern Pacific Ocean during H2, H1 and the Younger Dryas
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Deep sea corals off Brazil verify a poorly ventilated Southern Pacific Ocean during H2, H1 and the Younger Dryas

机译：巴西海域深海珊瑚证实了H2，H1和年轻树妖在夏季期间南太平洋的通风不良

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摘要

Simultaneous C-14 and Th/U dating of deep sea corals are useful for reconstructing the intensity of deep ocean circulation in the past, as they deliver the time between the gas exchange of the water with the atmosphere and the incorporation of the C-14 in the carbonates (Adkins and Boyle, 1997; Adkins et al., 1998; Mangini et al., 1998). Th/U ages of deep sea corals sampled in sediment cores from locations off the coast of Brazil bathed by Antarctic Intermediate Water at depths between 600 and 800 m group close to Heinrich events H2, H1 and the Younger Dryas. The Delta C-14 of the water bathing the corals starts to decrease approximately 2 kyr before the Heinrich events and decreases to values 400% lower than the corresponding back tracked atmospheric values. The timing and the magnitude of the decrease is similar to that observed in intermediate water in the N. Pacific off Baja California (Marchitto et al., 2007) and in the Eastern Pacific (Stott et al., 2009). High ventilation ages, partly exceeding 4000 years, are an unambiguous indication for a reduction of North Atlantic deep water formation during H2, H1 and the YD, as deduced from higher Pa-231/Th-230 activity ratios and from epsilon Nd in N. Atlantic Ocean sediments (McManus et al., 2004; Pahnke et al., 2008; Yu et al., 1996). They also could indicate a poorly oxygenated Southern Pacific Ocean at the end of the Heinrich events.
机译：同时对深海珊瑚进行C-14和Th / U测年有助于重建过去的深海环流强度，因为它们传递了水与大气之间的气体交换与C-14结合之间的时间。在碳酸盐岩中（Adkins和Boyle，1997; Adkins等，1998; Mangini等，1998）。在海因里希事件H2，H1和Younger Dryas附近，在巴西海岸外被南极中层水沐浴的深海珊瑚的Th / U年龄在600至800 m的深度范围内。在海因里希事件之前，沐浴珊瑚的水的三角洲C-14值开始下降约2 kyr，并下降到比相应的回溯大气值低400％的值。下降的时间和幅度与在下加利福尼亚州北部的北太平洋（Marchitto等，2007）和东太平洋的中层水（Stott等，2009）相似。高通风年龄（部分超过4000年）明确表明，H2，H1和YD期间北大西洋深水形成减少，这是由于较高的Pa-231 / Th-230活度比和N中的Ndε所致。大西洋沉积物（McManus等，2004; Pahnke等，2008; Yu等，1996）。它们也可能表明海因里希事件结束时南太平洋的含氧量很低。

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