Progressive Intensification of Pacific Deep Water Circulation Since the Early Pliocene
Progressive Intensification of Pacific Deep Water Circulation Since the Early Pliocene
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DOI：
10.1029/2022gl098051
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发表时间：
2022-04
影响因子：
5.2
通讯作者：
Shaoru Yin;F. Hernández‐Molina;M. Jutzeler;Jiabiao Li
中科院分区：
文献类型：
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作者：
Shaoru Yin;F. Hernández‐Molina;M. Jutzeler;Jiabiao Li
全球海洋翻转环流的一个重要阶段是南极底层水向太平洋深层水的上涌。然而，PDW环流的长期演变几乎没有得到解决。我们使用地震反射数据和核心从国际海洋发现计划（及其前身）在等高线重建区域深海环流模式。在这里，我们表明，PDW循环是逐步增强约4.35，3.84，2.16，和0.97 Ma以来上新世早期。同时代火山弧和构造隆起的增长逐渐将边缘海与PDW隔离开来，并与气候冷却相结合，有效地增加了太平洋盆地内不断缩小的深水通量。等深岩中的区域地层不连续性表明海洋环流加强的阈值。
An important stage in global ocean overturning circulation is the upwelling of the Antarctic Bottom Water into the Pacific Deep Water (PDW). The long‐term evolution of PDW circulation, however, is scarcely addressed. We use seismic reflection data and cores from the International Ocean Discovery Program (and its predecessors) in contourites to reconstruct regional deep ocean circulation patterns. Here, we demonstrate that PDW circulation was progressively enhanced at about 4.35, 3.84, 2.16, and 0.97 Ma since the early Pliocene. Coeval growth of volcanic arcs and tectonic uplifts gradually isolated marginal seas from the PDW and, in conjunction with climate cooling, effectively increasing deep‐water flux within a shrinking Pacific basin. Regional stratigraphic discontinuities in contourites indicate thresholds in the intensification of ocean circulation.