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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 >Decadal variability of sea surface temperatures off North Iceland over the last 2000 years
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Decadal variability of sea surface temperatures off North Iceland over the last 2000 years

机译：过去2000年北冰岛海域海表温度的年代际变化

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摘要

Ocean variability at decadal time-scales remains poorly described partly because of the scarcity of high temporal resolution marine records. Here, we present a reconstruction of Sea Surface Temperatures (SSTs) over the past two millennia at unprecedented temporal resolution (2 to 5 years), from a marine core located off North Iceland. Alkenone paleothermometry was used to infer SST variability, and tephrochronology to build the age model. Spectral analyses of the SST signal indicate intermittent 20-25 year oscillations, with periods of strong and weak power, that are likely reflecting the ocean response to wind forcing, presumably the North Atlantic Oscillation (NAO). Warmer SSTs and paleo-magnetic proxy data, between 1000 and 1350 year A.D., overlapping the Medieval Warm Period (MAT), suggest enhanced heat transport across the Denmark Strait by the North Icelandic Irminger Current (NIIC). This is in contrast with the subsequent period, which includes the Little Ice Age (LIA), showing continuous cooling towards the 20th century. Reduced NIIC flow through the Denmark Strait likely resulting from higher freshwater and sea ice export from the Arctic would account for the observed colder conditions.
机译：十年时间尺度上的海洋变异性仍然描述得很差，部分原因是缺乏高时间分辨率的海洋记录。在这里，我们从过去的两千年中，从位于冰岛北部的海洋中心，以前所未有的时间分辨率（2至5年）重建了海表温度（SST）。烯酮古体温法用于推断SST的变异性，年代学用于建立年龄模型。 SST信号的频谱分析表明，间歇性的20-25年振荡，具有强弱周期，这很可能反映了海洋对强迫风的反应，大概是北大西洋涛动（NAO）。公元1000年至1350年之间的暖SST和古磁代理数据与中世纪暖期（MAT）重叠，表明北冰岛艾明格潮流（NIIC）增强了横跨丹麦海峡的热传输。与此形成鲜明对比的是随后的时期，其中包括小冰期（LIA），该时期一直持续到20世纪。由于北极地区淡水和海冰出口量增加，可能导致NIIC通过丹麦海峡的流量减少，这是观测到的较冷条件的原因。

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