A ~4500 yr record of river floods obtained from a sediment core in Lake Atnsjøen, eastern Norway
A ~4500 yr record of river floods obtained from a sediment core in Lake Atnsjøen, eastern Norway
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从挪威东部 Atnsjøen 湖的沉积物岩芯中获得约 4500 年的河流洪水记录
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发表时间：
2001
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通讯作者：
Mark S. Berrisford
中科院分区：
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作者：
A. Nesje;S. Dahl;J. Matthews;Mark S. Berrisford
为了延长挪威南部河流洪水的历史记录，从挪威东部Atnsjøen的42米水深处提取了一个572厘米长的沉积物岩心。沉积物岩心包含30个浅灰色碎屑沉积层，据解释是在无冰雪季节的河流洪水期间沉积的。在岩心上部123厘米处，有四个突出的洪水层。其中最年轻的与历史记录重叠。最厚的（洪水层5）可能反映了与“小冰期”相关的中世纪后气候恶化（气温较低，积雪较厚且持续时间更长，雨/暴风雪更频繁）导致的河流洪水活动的普遍增加。根据11个大量AMS放射性碳测年的线性回归年龄模型，岩心中最明显的史前洪水层沉积在4135、3770、3635、3470、3345、2690、2595、2455、2415、2255、2230、2150、2120、1870、1815、1665、1640、1480、1400、1380、1290、935、885、670、655和435 cal. BP （BP = AD 1950）左右。根据年龄线性回归模型，河流洪水层的平均回归周期为~ 150±30 cal. yr（平均±1 S.E.）。
To extend the historical record of river floods in southern Norway, a 572-cm long sediment core was retrieved from 42 m water depth in Atnsjøen, eastern Norway. The sediment core contains 30 light gray clastic sediment layers interpreted to have been deposited during river floods in the snow/ice free season. In the upper 123 cm of the core, four prominent flood layers occur. The youngest of these overlap with the historical record. The thickest (flood layer 5) possibly reflects a general increase in river-flood activity as a result of the post-Medieval climate deterioration (lower air temperatures, thicker and more long-lasting snow cover, and more frequent rain/snow storms) associated with the ‘Little Ice Age’. The most pronounced pre-historic flood layers in the core were, according to an age model based on linear regression between eleven bulk AMS radiocarbon dates, deposited around 4135, 3770, 3635, 3470, 3345, 2690, 2595, 2455, 2415, 2255, 2230, 2150, 2120, 1870, 1815, 1665, 1640, 1480, 1400, 1380, 1290, 935, 885, 670, 655 and 435 cal. BP (BP = AD 1950). The mean return period of the river flood layers is, according to the linear regression age model, ~ 150 ± 30 cal. yr (mean ± 1 S.E.).