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首页> 外文期刊>Climate of the past >Tracing winter temperatures over the last two millennia using a north-east Atlantic coastal record
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Tracing winter temperatures over the last two millennia using a north-east Atlantic coastal record

机译：使用东北大西洋沿岸记录追踪过去两千年的冬季温度

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摘要

We present 2500 years of reconstructed bottom water temperatures (BWT) using a fjord sediment archive from the north-east Atlantic region. The BWT represent winter conditions due to the fjord hydrography and the associated timing and frequency of bottom water renewals. The study is based on a ca. 8 m long sediment core from Gullmar Fjord (Sweden), which was dated by Pb-210 and AMS C-14 and analysed for stable oxygen isotopes (delta O-18) measured on shallow infaunal benthic foraminiferal species Cassidulina laevigata d'Orbigny 1826. The BWT, calculated using the palaeotemperature equation from McCorkle et al. (1997), range between 2.7 and 7.8 degrees C and are within the annual temperature variability that has been instrumentally recorded in the deep fjord basin since the 1890s. The record demonstrates a warming during the Roman Warm Period (similar to 350 BCE-450 CE), variable BWT during the Dark Ages (similar to 450-850 CE), positive BWT anomalies during the Viking Age/Medieval Climate Anomaly (similar to 850-1350 CE) and a long-term cooling with distinct multidecadal variability during the Little Ice Age (similar to 1350-1850 CE). The fjord BWT record also picks up the contemporary warming of the 20th century (presented here until 1996), which does not stand out in the 2500-year perspective and is of the same magnitude as the Roman Warm Period and the Medieval Climate Anomaly.
机译：我们使用来自东北大西洋地区的峡湾沉积物档案，介绍了2500年的重建底水温度（BWT）。由于峡湾水文学以及相关的底水更新时间和频率，BWT代表冬季条件。该研究基于约。来自Gullmar Fjord（瑞典）的8 m长沉积物岩心，日期由Pb-210和AMS C-14测得，并分析了在浅层未成年底栖有孔虫物种Cassidulina laevigata d'Orbigny 1826上测得的稳定氧同位素（δO-18）。 BWT，使用McCorkle等人的古温度方程计算得出。 （1997年）的温度范围在2.7至7.8摄氏度之间，并且处于自1890年代以来在深峡湾盆地中有仪器记录的年温度变化范围之内。记录表明，罗马温暖时期（类似于350 BCE-450 CE）期间变暖，黑暗时期（类似于450-850 CE）期间变暖峰，维京时代/中世纪气候异常（类似于850岁）则为BWT正异常-1350年）和在小冰河时期的长期降温，且具有明显的年代际变化（类似于1350-1850年）。峡湾的BWT记录还记录了20世纪的当代变暖（直到1996年才出现），这在2500年的角度上并不突出，与罗马温暖时期和中世纪气候异常的程度相同。

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  • 来源
    《Climate of the past》 |2018年第7期|1097-1118|共22页
  • 作者

    Asteman Irina Polovodova; Filipsson Helena L.; Nordberg Kjell;

  • 作者单位

    Univ Gothenburg, Dept Marine Sci, Carl Skottsbergsgata 22B, S-41319 Gothenburg, Sweden;

    Lund Univ, Dept Geol, Solvegatan 12, S-22362 Lund, Sweden;

    Univ Gothenburg, Dept Marine Sci, Carl Skottsbergsgata 22B, S-41319 Gothenburg, Sweden;

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