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首页> 外文期刊>Paleoceanography >Linkages between East Antarctic Ice Sheet extent and Southern Ocean temperatures based on a Pliocene high-resolution record of ice-rafted debris off Prydz Bay, East Antarctica
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Linkages between East Antarctic Ice Sheet extent and Southern Ocean temperatures based on a Pliocene high-resolution record of ice-rafted debris off Prydz Bay, East Antarctica

机译：南极东部冰盖范围与南海温度之间的联系，基于上新世高分辨率记录的南极东部普莱兹湾外的冰筏残骸

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摘要

Ice-rafted debris mass accumulation rates (IRD MAR) at a drill site on the Antarctic continental margin are investigated to evaluate the linkages between East Antarctic Ice Sheet extent and Southern Ocean temperatures in the early to mid-Pliocene. ODP Site 1165 is within 400 km of the Antarctic coastline and in the direct pathway of icebergs released by the Amery Ice Shelf. The Amery Ice Shelf is the largest ice shelf in East Antarctica and it buttresses the Lambert Glacier drainage system, which accounts for 14% of the outflow from the East Antarctic Ice Sheet. IRD MAR were low during peak Southern Ocean warming in the early Pliocene. After a brief precursor, a tenfold increase in IRD MAR at 3.3 Ma marks the termination of the early Pliocene ice sheet minimum, coincident with the M2 glacial. For the mid-Pliocene, a strong correlation exists between the high-amplitude signal in the LR04 benthic stack and IRD MAR, suggesting linkages between East Antarctic ice extent, global ice volume and deep-water temperatures. The IRD record at Site 1165 provides evidence of greater sensitivity of the Lambert Glacier-Amery Ice Shelf system to Southern Ocean warming than is currently predicted by ice sheet models, which may relate to uncertainties in the understanding of ocean heat uptake, poleward heat transport and ice sheet-ocean interactions.
机译：研究了南极大陆边缘一个钻探点的冰筏碎屑质量累积速率（IRD MAR），以评估上新世早期至中期的南极东部冰盖范围与南海温度之间的联系。 ODP站点1165距离南极海岸线不到400公里，位于Amery冰架释放的冰山直接通道中。阿默里冰架是南极洲东部最大的冰架，它支撑着兰伯特冰川排水系统，该系统占东极南极冰原流出量的14％。在上新世早期，南极海洋变暖高峰期间，IRD MAR较低。经过短暂的前兆后，IRD MAR在3.3 Ma处增加了十倍，这标志着上新世冰盖最小的终止，与M2冰河相吻合。在上新世中期，LR04底栖生物中的高振幅信号与IRD MAR之间存在很强的相关性，这表明南极东部冰面积，全球冰量和深水温度之间存在联系。 IRD在1165号站点上的记录提供了证据，证明兰伯特冰川-美国冰架系统对南大洋变暖的敏感性比目前冰盖模型预测的要高，这可能与对海洋热量吸收，极地热传输和冰原与海洋的相互作用。

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