Phasing of millennial-scale climate variability in the Pacific and Atlantic Oceans
Phasing of millennial-scale climate variability in the Pacific and Atlantic Oceans
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DOI：
10.1126/science.aba7096
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发表时间：
2020-11-06
期刊：
影响因子：
56.9
通讯作者：
Zellers, Sarah D.
中科院分区：
文献类型：
--
作者：
Walczak, Maureen H.;Mix, Alan C.;Zellers, Sarah D.
来自阿拉斯加湾的新的放射性碳和沉积学结果表明，太平洋重新组织的通气与科迪勒拉冰盖的快速排放同步发生，这表明在过去4.2万年中冰-海动力学的密切耦合。北太平洋中深度的通风跟踪亚洲季风的强度，支持北太平洋古气候中低纬度湿热输送的作用。中间水域碳14年龄的变化与科迪勒山脉漂流碎片运送的峰值是同步的，两者都始终先于劳伦泰德冰盖的冰排放事件，即海因里希事件。这个时间排除了大西洋触发科迪勒拉冰盖退缩的可能性，而是暗示太平洋是一系列具有全球影响的动态气候事件的早期部分。
New radiocarbon and sedimentological results from the Gulf of Alaska document recurrent millennial-scale episodes of reorganized Pacific Ocean ventilation synchronous with rapid Cordilleran Ice Sheet discharge, indicating close coupling of ice-ocean dynamics spanning the past 42,000 years. Ventilation of the intermediate-depth North Pacific tracks strength of the Asian monsoon, supporting a role for moisture and heat transport from low latitudes in North Pacific paleoclimate. Changes in carbon-14 age of intermediate waters are in phase with peaks in Cordilleran ice-rafted debris delivery, and both consistently precede ice discharge events from the Laurentide Ice Sheet, known as Heinrich events. This timing precludes an Atlantic trigger for Cordilleran Ice Sheet retreat and instead implicates the Pacific as an early part of a cascade of dynamic climate events with global impact.