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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Seasonally resolved diatom δ~(18)O records from the West Antarctica Peninsula over the last deglaciation
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Seasonally resolved diatom δ~(18)O records from the West Antarctica Peninsula over the last deglaciation

机译：南极西半岛最后一次冰消期的季解硅藻δ〜（18）O记录

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摘要

Understanding the response of the Antarctic ice sheets during the rapid climatic change that accompanied the last deglaciation has implications for establishing the susceptibility of these regions to future 21st Century warming. A unique diatom δ~(18)O record derived from a high-resolution deglacial seasonally laminated core section off the west Antarctica Peninsula (WAP) is presented here. By extracting and analysing single species samples from individual laminae, season-specific isotope records were separately generated to show changes in glacial discharge to the coastal margin during spring and summer months. As well as documenting significant intra-annual seasonal variability during the deglaciation, with increased discharge occurring in summer relative to spring, further intra-seasonal variations are apparent between individual taxa linked to the environment that individual diatom species live in. Whilst deglacial δ18O are typically lower than those for the Holocene, indicating glacial discharge to the core site peaked at this time, inter-annual and inter-seasonal alternations in excess of 3‰ suggest significant variability in the magnitude of these inputs. These deglacial variations in glacial discharge are considerably greater than those seen in the modern day water column and would have altered both the supply of oceanic warmth to the WAP as well as regional marine/atmospheric interactions. In constraining changes in glacial discharge over the last deglaciation, the records provide a future framework for investigating links between annually resolved records of glacial dynamics and ocean/climate variability along the WAP.
机译：了解伴随最后一次冰消的快速气候变化过程中南极冰盖的响应，对确定这些地区对未来21世纪变暖的敏感性具有影响。这里展示了一个独特的硅藻δ〜（18）O记录，该记录是由南极半岛西部（WAP）附近高分辨率的冰川消融的季节性叠层岩心剖面得出的。通过从单个薄片中提取和分析单个物种样本，分别生成了特定季节的同位素记录，以显示春季和夏季月份到沿海边缘的冰川排放量的变化。除了记录冰消融过程中明显的年内季节变化（夏季相对于春季排放增加）之外，与个体硅藻物种所生活的环境有关的个体分类单元之间的进一步季节内变化也很明显。低于全新世，表明此时核心位置的冰河流量达到峰值，年际和季节间的交替超过3‰，表明这些投入量的变化很大。这些冰川融化的冰川变化远大于现代水柱中的冰川变化，并且将改变WAP的海洋温暖供应以及区域海洋/大气相互作用。为了限制最后一次冰消期间的冰河流量变化，这些记录提供了一个未来的框架，用于调查每年解析的冰河动力学记录与沿WAP的海洋/气候变化之间的联系。

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