Reconstruction of Kuroshio intrusion into the south China sea over the last 40 kyr
Reconstruction of Kuroshio intrusion into the south China sea over the last 40 kyr
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DOI：
10.1016/j.quascirev.2022.107622
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发表时间：
2022-08
影响因子：
4
通讯作者：
Xingyan Shen;Bangqi Hu;Hong Yan;J. Dodson;Jingtao Zhao;Jun Li;Xue Ding;Qing Li;Xingxing Wang-Xin
中科院分区：
文献类型：
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作者：
Xingyan Shen;Bangqi Hu;Hong Yan;J. Dodson;Jingtao Zhao;Jun Li;Xue Ding;Qing Li;Xingxing Wang-Xin
黑潮通过吕宋海峡向南海输送大量的热量和水汽，并对南海的水文气候起着重要的调节作用。然而，没有详细的高分辨率的历史黑潮入侵到南海之前的全新世。CS 11孔的粘土矿物组合和Sr-Nd同位素（87 Sr/86 Sr和εNd）代表了台湾和吕宋河流沉积物在南海深盆中的相对丰度，可以进一步作为黑潮侵入南海的相对变化的代用指标。结合线性沉积速率（LSR）和前人的研究结果，我们证明了黑潮在南海和太平洋之间的变化在每个海洋同位素阶段都表现出相反的趋势，类似于其现代形态的盈亏。厄尔尼诺-南方涛动（ENSO）是近40 kyr黑潮变化的主要驱动因子。在海洋同位素阶段（MIS）3晚期，由于类厄尔尼诺条件的强度下降，黑潮入侵南海逐渐减少，而在MIS 2期间，特别是在末次冰盛期（LGM），当黑潮在开放太平洋的输送减弱时，类厄尔尼诺状态有利于黑潮入侵南海。黑潮入侵南海在全新世早期基本上是缓慢的，当一个拉尼娜的条件盛行，然后黑潮入侵加强在全新世中晚期的厄尔尼诺频率的影响下。
The Kuroshio current transports large amounts of heat and water vapor into the South China Sea (SCS) through the Luzon Strait and plays a key role in modulating the surrounding hydroclimate. However, there is no detailed high-resolution history of the Kuroshio intrusion into the SCS preceding the Holocene. Here, clay mineral assemblages and Sr–Nd isotopic values (87Sr/86Sr and εNd) of core CS11 represent the relative abundance of Taiwan and Luzon fluvial sediment contributions in the SCS deep basin, which can be further used as proxies of relative variation of the Kuroshio intrusion into the SCS over the past 40 kyr. Combined with linear sedimentation rate (LSR) and results of previous studies, we demonstrate that variations of Kuroshio currents between the SCS and the open Pacific display opposing trends within each marine isotope stage, similar to the waxing and waning of its modern configuration. The El Niño–Southern Oscillation (ENSO) has acted as the key factor driving variations of the Kuroshio currents over the past 40 kyr. During late marine isotope stage (MIS) 3, the Kuroshio intrusion into the SCS gradually decreased due to decline in intensity of El Niño-like conditions, while an El Niño-like state favored the Kuroshio intrusion into the SCS during MIS 2, in particular during the Last Glacial Maximum (LGM) when Kuroshio transport in the open Pacific weakened. The Kuroshio intrusion into the SCS was largely sluggish in the early Holocene, when a La Niña-like condition prevailed, and then the Kuroshio intrusion was enhanced during the middle to late Holocene under the influence of increased El Niño frequency.