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首页> 外文期刊>Journal of quaternary science: JQS >Deglacial seasonal and sub-seasonal diatom record from Palmer Deep, Antarctica
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Deglacial seasonal and sub-seasonal diatom record from Palmer Deep, Antarctica

机译：来自南极洲帕尔默深度的冰期季节和亚季节硅藻记录

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摘要

The Antarctic Peninsula is one of the most sensitive regions of Antarctica to climate change. Here, ecological and cryospheric systems respond rapidly to climate fluctuations. A 4.4 m thick laminated diatom ooze deposited during the last deglaciation is examined from a marine sediment core (ODP Site 1098) recovered from Basin 1, Palmer Deep, western Antarctic Peninsula. This deglacial laminated interval was deposited directly over a glaciomarine diamict, hence during a globally recognised period of rapid climate change. The ultra-high-resolution deglacial record is analysed using SEM backscattered electron imagery and secondary electron imagery. Laminated to thinly bedded orange-brown diatom ooze (near monogeneric Hyalochaete Chaetoceros spp. resting spores) alternates with blue-grey terrigenous sediments (open water diatom species). These discrete laminae are interpreted as austral spring and summer signals respectively, with negligible winter deposition. Sub-seasonal sub-laminae are observed repeatedly through the summer laminae, suggesting variations in shelf waters throughout the summer. Tidal cycles, high storm intensities and/or intrusion of Circumpolar Deep Water onto the continental shelf introduced conditions which enhanced specific species productivity through the season. Copyright (C) 2005 John Wiley & Sons, Ltd.
机译：南极半岛是南极洲对气候变化最敏感的地区之一。在这里，生态和冰冻圈系统对气候波动迅速做出反应。最后一次冰消期间沉积的4.4 m厚叠层硅藻泥是从南极半岛西部帕尔默深海盆地1的海洋沉积物岩心（ODP站点1098）中检测到的。该冰期夹层层段直接沉积在冰川海洋二叠氮化物上，因此在全球公认的快速气候变化时期。使用SEM背散射电子图像和二次电子图像分析超高分辨率冰河记录。层压成薄层状的橙棕色硅藻软泥（靠近单一类的Hyalochaete Chaetoceros spp。静止孢子）与蓝灰色陆源沉积物（开放水域硅藻种类）交替出现。这些离散的薄层分别被解释为春季和夏季的南半球信号，而冬季的沉积可以忽略不计。在整个夏季薄层中反复观察到了次季节的次薄层，这表明整个夏季的架子水都有变化。潮汐周期，高风暴强度和/或环极深水侵入大陆架，为整个季节提高了特定物种的生产力创造了条件。版权所有（C）2005 John Wiley＆Sons，Ltd.

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