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首页> 外文期刊>Paleoceanography >A decadal-scale Holocene sea surface temperature record from the subpolar North Atlantic constructed using diatoms and statistics and its relation to other climate parameters
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A decadal-scale Holocene sea surface temperature record from the subpolar North Atlantic constructed using diatoms and statistics and its relation to other climate parameters

机译：利用硅藻和统计数据构建的北大西洋次极地全新世十年海表温度记录及其与其他气候参数的关系

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摘要

A sediment core from Reykjanes Ridge has been studied at 10- to 50-year time resolution to document variability of Holocene surface water conditions in the western North Atlantic and to evaluate effects of Holocene ice-rafting episodes. Diatom assemblages are converted to quantitative sea surface temperatures (SST) using three different transfer functions. Spectral and scale-space methods are also applied on the records to explore variability at different timescales. Diatom assemblage and SST records clearly show that decaying remnants of the Laurentide ice sheet strongly influenced early Holocene climate in the western North Atlantic. This overrode the predominance of Milankovitch forcing, which played a key role in the development of Holocene climate in the eastern North Atlantic and Nordic Seas. Superimposed on general Holocene climate change is high-frequency SST variability on the order of 1 degrees -3 degrees C. The record also documents climatic oscillations with 600- to 1000-, similar to 1500-, and 2500-year periodicities, with a time-dependent dominance of different periodicities through the Holocene; a clear change in variability occurred about 5 ka BP. The SST record also provides evidence for Holocene cooling events (HCE) that, in some cases, correlate to documented southward intrusions of ice into the North Atlantic.
机译：已经以10至50年的时间分辨率研究了来自雷克雅尼斯海岭的沉积物核心，以记录北大西洋西部全新世地表水状况的变化并评估全新世的漂流事件的影响。使用三种不同的传递函数，将硅藻组合物转换为定量海面温度（SST）。频谱和比例空间方法也应用于记录，以探索不同时标的可变性。硅藻的组合和SST记录清楚地表明，Laurentide冰盖的腐烂残余强烈影响了北大西洋西部的全新世早期气候。这推翻了Milankovitch强迫的主导地位，后者在北大西洋东部和北欧海的全新世气候的发展中发挥了关键作用。在全新世气候变化的基础上，高频SST的变化大约在1度-3摄氏度之间。该记录还记录了600-1000年（类似于1500-2500年）和2500年周期的气候振荡通过全新世的不同周期性的主导地位;大约5 ka BP发生了明显的变异性变化。 SST记录还提供了全新世冷却事件（HCE）的证据，在某些情况下，该事件与有记载的向南向北大西洋冰的入侵有关。

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