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Enhanced direct ventilation in the subarctic Pacific Ocean during 3.5–2.73 Ma: New evidence of elemental results from ODP Site 882
Global and Planetary Change ( IF 3.9 ) Pub Date : 2022-06-10 , DOI: 10.1016/j.gloplacha.2022.103867
Ting Chen , Qingsong Liu , Xiaodan Wang

Ocean ventilation change in the subarctic Pacific Ocean is critical for regulating nutrients, heating, and ocean–atmosphere CO2 exchange. Debate continues over whether direct ventilation in the subarctic Pacific Ocean has reached the deep/bottom oceans on different time scales over the last millions of years. Here, we studied the main and trace elements, including Si, Ca, Ba, Zn, Zr, and Rb, and stable nitrogen isotope signals between 5.5 and 2.5 Ma at Ocean Drilling Program (ODP) Site 882. Our results revealed that weakening of deep/bottom water circulation after 3.5 Ma at ODP Site 882 was strongly linked to slowdown of deep/bottom water ventilation in the Atlantic and Southern Ocean. Element results indicated increase in oxygen content between ~3.5 and 2.73 Ma, supporting the suggestion of North Pacific Deep Water formation. Surface vertical mixing strength varied over a long cycle of ~400 kyr during the Early- to Mid-Pliocene in the northwest subarctic Pacific Ocean, which was linked to sea surface temperature gradient between low- and high- latitude regions caused by solar radiation differences regulated by changes in the Earth's orbital eccentricity.



中文翻译:

3.5-2.73 Ma 期间亚北极太平洋增强直接通风:ODP Site 882 元素结果的新证据

亚北极太平洋的海洋通风变化对于调节养分、加热和海洋-大气 CO 2至关重要交换。关于在过去数百万年中,亚北极太平洋的直接通风是否在不同时间尺度上到达深海/海底的争论仍在继续。在这里,我们研究了海洋钻探计划(ODP)站点 882 的主要元素和微量元素,包括 Si、Ca、Ba、Zn、Zr 和 Rb,以及 5.5 到 2.5 Ma 之间的稳定氮同位素信号。我们的结果表明, ODP Site 882 3.5 Ma 后的深/底水循环与大西洋和南大洋的深/底水通风放缓密切相关。元素结果表明氧含量在约 3.5 和 2.73 Ma 之间增加,支持北太平洋深水形成的建议。在西北亚北极太平洋的上新世早期至中期,地表垂直混合强度在约 400 kyr 的长周期内变化,

更新日期:2022-06-10
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