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Holocene temperature and salinity variability of the Atlantic Water inflow to the Nordic seas

机译：大西洋流入北欧海洋的全新世温度和盐度变化

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摘要

Piston core LINK 14 from 346 m water depth on the eastern shelf of the Faroe Islands in the Faroe-Shetland Channel has been investigated in order to reconstruct temperature and salinity changes of the Atlantic surface Water during the Holocene. We have analyzed the distribution of benthic and planktic foraminifera, stable isotopes and calculated by transfer functions absolute surface, subsurface and bottom water temperatures and salinities. The summer sea surface temperature (SST) shows a stepwise decrease from an early-Holocene warm phase 10 300—8300 yr BP with temperatures around 12°C, over a mid-Holocene cooler phase 8300—4000 yr BP, to a late-Holocene relatively cool phase with SST around or slightly below I I °C. Bottom water temperatures at 346 m water depth show much less variation than the SST. The late-Holocene sea surface cooling was probably caused by increase in the influence of the polar East Icelandic Current. A distinct decrease in the subsurface salinity from about 8300 to 6800 yr BP is probably also due to a stronger East Icelandic Current.The benthic faunas indicate strong bottom current activity during the entire period. A single exceptional disturbance dated to approximately 8300 yr BP was probably caused by extraordinary high bottom current velocities.The event is marked by a significant coarsening of the sediments and a sorting by size of the foraminifera.The event is close in time to the 8.2-ka cooling event, but more likely correlates with the Storegga slide event.
机译：为了重建全新世期间大西洋地表水的温度和盐度变化，已经对法罗群岛-设得兰群岛通道法罗群岛东架346 m水深处的活塞核LINK 14进行了研究。我们分析了底栖和板状有孔虫的分布，稳定的同位素，并通过传递函数计算了地表，地下和底部水的绝对温度和盐度。夏季海面温度（SST）从全新世中期10300-8300年BP逐步降低，温度在12°C左右，而全新世中期较冷的8300-4000 BP逐渐降低到全新世晚期相对冷的阶段，SST约为II°C或略低于II°C。水深346 m处的底部水温显示的变化远小于SST。全新世晚期海面冷却可能是由极地东冰岛洋流的影响增加引起的。地下盐度从大约8300 BP到6800 yr BP明显下降，也可能是由于东冰岛海流较强。底栖动物区系表明整个时期底部海流活动活跃。一次异常的扰动可能是由异常高的底流速度引起的，大约在8300年BP，该事件的特征是沉积物明显变粗，并根据有孔虫的大小进行了排序，该事件的发生时间接近8.2-BP。冷却事件，但更可能与Storegga幻灯片事件相关。

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