Reconstruction of modified Circumpolar Deep Water intrusion and its oceanographic impact in Prydz Bay, East Antarctica
Reconstruction of modified Circumpolar Deep Water intrusion and its oceanographic impact in Prydz Bay, East Antarctica
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DOI：
10.1016/j.quascirev.2023.108400
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发表时间：
2023-12
影响因子：
4
通讯作者：
X.H. Guo;L.J. Yang;Y.S. Gao;T. Huang;H.W. Liu;L.G. Sun;Z. Q. Xie
中科院分区：
文献类型：
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作者：
X.H. Guo;L.J. Yang;Y.S. Gao;T. Huang;H.W. Liu;L.G. Sun;Z. Q. Xie
海洋学观测和模式研究表明，暖修正的环极深水（mCDW）入侵带来的热量加速了南极冰架的融化和海冰的流失。受仪器记录时间尺度的限制，历史时期mCDW侵入东南极大陆架的记录很少。在这里，我们提出了一个新的代理的Adélie企鹅羽毛中的镉（Cd）浓度的鸟源沉积物剖面重建的变化mCDW入侵到大陆架在南极洲东部的普里兹湾，在过去的2500年。我们的重建显示，入侵的mCDW增强从1500年到300年BP，刺激区域增加冰川流量和减少海冰;在大约200年BP，mCDW入侵减弱，然后继续增强，在过去的150年左右。此外，增强的mCDW入侵Pradizz湾似乎是由南半球西风带（SWW）的南移和加强驱动的。结果表明，由于西南风的这种趋势预计将持续到21世纪世纪，因此，未来进入普里兹湾的mCDW可能会继续增加，威胁到冰架和海冰的稳定性，甚至威胁到南极底层水的形成。
Oceanographic observations and models show that the heat brought by the warm modified Circumpolar Deep Water (mCDW) intrusion accelerates the melting of the Antarctic ice shelf and the loss of sea ice. Limited by the time scale of instrument recording, there are few records of mCDW intrusion into the East Antarctic continental shelf in the historical period. Here, we present a novel proxy of cadmium (Cd) concentrations in Adélie penguin feathers in an ornithogenic sediment profile to reconstruct the variability in mCDW intrusion into the continental shelf in Prydz Bay, East Antarctica, over the past 2500 years. Our reconstruction revealed that the intrusion of mCDW was enhanced from ∼1500 to 300 yr BP, stimulating the regional increase in glacier discharge and decrease in sea ice; at approximately 200 yr BP, mCDW intrusion weakened and then continued to enhance again during approximately the last 150 years. Furthermore, the enhancement of mCDW intrusion into Prydz Bay appeared to be driven by the southward shift and strengthening of the Southern Hemisphere Westerlies (SWW). The results implied that since this trend in SWW is forecasted for persisting into the 21st century, mCDW intrusion into Prydz Bay may increase continuously, threatening the stability of ice shelf and sea ice, and even the Antarctic Bottom Water formation in the future.