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首页> 外文期刊>Paleoceanography >Evidence for sea level and monsoonally driven variations in terrigenous input to the northern East China Sea during the last 24.3ka
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Evidence for sea level and monsoonally driven variations in terrigenous input to the northern East China Sea during the last 24.3ka

机译：最近24.3ka期间海平面和季风驱动的北东海陆源输入变化的证据

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摘要

Geochemical and sedimentological analyses of core PC-1 recovered from the northern East China Sea (ECS) provide insights into variations in terrigenous input associated with sea level and climate changes over the past 24.3ka. Based on high-resolution multiproxy records, our results suggest that the competing processes of sea level and monsoonally driven precipitation determined terrigenous input to the northern ECS. Dominance of terrigenous material, along with relatively light Globigerinoides ruber O-18, indicates that the Last Glacial Maximum (LGM) lowstand of sea level has occurred during the period 21.5-19.6ka, not suggesting an early slow rise but supporting the conventional LGM age of 21ka. This LGM lowstand was terminated by the rapid sea level rise of 19ka meltwater pulse (MWP), which is well expressed by the nearly synchronous decreases in both terrigenous detritus and mean grain size from 19.6 to 18.9ka. MWP-1A is clearly marked in our records by a sharp reduction in terrigenous input and pronounced maxima of G. ruber O-18 at 15.3-14.8ka, given the considerable age uncertainties of deglacial marine radiocarbon samples. A slightly increasing input of terrigenous matter is noted after 13.4ka, potentially pointing to a sea level fall following the Inter-AllerOd Cooling Period, which was seldom reported previously. Although MWP-1B did not leave robust signatures in terrigenous input, it is explicitly captured by the heavy O-18 of G. ruber and decline in mean grain size at 11.5-10.9ka. MWP-1c probably occurred in a broad millennial interval with multiple peaks, which are robustly marked by the abrupt variations in terrigenous input and marine organic matter at 9.7-9.3 and 9.1ka, respectively. During the late Holocene, the effect of continuously weakening monsoon precipitation overwhelmed that of stable sea level resulting in a uniform increase in the proportion of marine-derived organic matter after 5.5ka.
机译：从东海北部（ECS）回收的PC-1核心的地球化学和沉积学分析提供了有关过去24.3ka与海平面和气候变化相关的陆源输入变化的见解。基于高分辨率的多代理记录，我们的结果表明，海平面和季风驱动的降水的竞争过程决定了北部ECS的陆源输入。陆源物质的优势以及相对较轻的Globigerinoides橡树O-18，表明在21.5-19.6ka期间发生了最后冰期最高（LGM）低海平面，这并不意味着早期缓慢上升，但支持常规的LGM年龄。 21ka。 LGM的这一低潮被19ka融水脉冲（MWP）的快速海平面上升所终止，而陆源碎屑和平均粒度从19.6至18.9ka几乎同步下降就很好地表示了这一点。鉴于冰河海洋放射性碳样品存在相当大的年龄不确定性，在我们的记录中，MWP-1A的明显特征是陆生输入的急剧减少和藏红曲霉O-18的最大值在15.3-14.8ka。在13.4ka之后，发现陆源物质的输入量略有增加，这可能表示在Inter-AllerOd冷却期之后海平面下降，此前很少报道。尽管MWP-1B在陆源输入中没有留下强大的特征，但它被G. ruber的沉重O-18明显捕获，平均粒度下降了11.5-10.9ka。 MWP-1c可能发生在一个宽的千年间隔内，有多个峰值，这明显地以陆源输入和海洋有机物在9.7-9.3和9.1ka处的突变为特征。在全新世晚期，季风降水持续减弱的影响超过了稳定海平面的影响，导致5.5ka之后海洋衍生有机物比例均匀增加。

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