Holocene relative sea level changes in the Västervik-Gamlebyviken region on the southeast coast of Sweden, southern Baltic Sea

IF 2.4 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Boreas Pub Date : 2022-10-05 DOI:10.1111/bor.12605
Christos Katrantsiotis, Martin Dahl, Veronica Palm, Johan Rönnby, Thomas Andrén, Elinor Andrén
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引用次数: 2

Abstract

We reconstruct the Holocene shore displacement of the Västervik-Gamlebyviken area on the southeast coast of Sweden, characterised by a maritime cultural landscape and archaeological significance since the Mesolithic. Sediment cores were retrieved from four lake basins that have been raised above sea level due to the postglacial land uplift and eustatic sea level changes after the melting of the Fennoscandian Ice Sheet. The cores were radiocarbon dated and analysed for loss on ignition and diatoms. The isolation thresholds of the basins were determined using LiDAR data. The results provide evidence for the initiation of the first Littorina Sea transgression in this area at 8.5 thousand calibrated years before present (cal. ka BP). A relative sea level rise by ∼7 m a.s.l. is recorded between 8.0 and 7.5 cal. ka BP with a highstand at ∼22 m a.s.l. between 7.5 and 6.2 cal. ka BP. These phases coincide with the second and third Littorina Sea transgressions, respectively, in the Blekinge area, southern Sweden and are consistent with the final deglaciation of North America. After 6.2 cal. ka BP, the relative sea level dropped below 22 m a.s.l., and remained at ∼20 m a.s.l. until 4.6 cal. ka BP coinciding with the fourth Littorina Sea transgression in Blekinge. From 4.6 to 4.2 cal. ka BP, the shore displacement shows a regression rate of 10 mm a−1 followed by a slowdown with a mean value of 4.6 mm a−1 until 1.6 cal. ka BP, when the relative sea level dropped below 3.3 m a.s.l. The Middle to Late Holocene highstand and other periods of minor sea level transgressions and/or higher salinity between 6.2 and 1.7 cal. ka BP are attributed to a combination of warmer climate and higher inflow of saline waters in the southern Baltic Sea due to stronger westerlies, caused by variations in the North Atlantic atmospheric patterns.

Abstract Image

波罗的海南部瑞典东南海岸Västervik‐Gamlebyviken地区全新世相对海平面变化
我们重建了瑞典东南海岸Västervik‐Gamlebyviken地区的全新世海岸位移,该地区以中石器时代以来的海洋文化景观和考古意义为特征。沉积物岩心采集自四个湖盆,这些湖盆在芬诺斯坎德冰盖融化后,由于冰川后的陆地隆升和海平面上升的变化而上升到海平面以上。对岩心进行了放射性碳定年,并分析了燃烧损失和硅藻。利用激光雷达数据确定盆地的隔离阈值。研究结果为该地区第一次滨海海海侵发生于距今8500标定年(cal. ka BP)提供了证据。海平面每年相对上升约7米。记录在8.0到7.5卡之间。ka BP在约22 m a.s.l处有一个高点。在7.5到6.2卡之间。ka BP。这些阶段分别与瑞典南部Blekinge地区的第二次和第三次滨海海侵相吻合,并与北美最后的冰川消退相一致。6.2个电话之后。ka BP,相对海平面每年降至22 m以下。,并保持在约20 m a.s.l。直到4.6。ka BP与blkinge的第四次滨海海侵相吻合。从4.6卡到4.2卡。ka BP时,海岸位移表现出10 mm a−1的回归速率,随后减慢,平均值为4.6 mm a−1,直到1.6 cal。ka BP,当相对海平面低于3.3 m a.s.l时。6.2 - 1.7 cal之间的中至晚全新世高点和其他小海平面海侵和/或更高盐度时期。ka BP归因于气候变暖和北大西洋大气模式变化引起的较强西风带导致波罗的海南部咸水流入增加。
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来源期刊
Boreas
Boreas 地学-地球科学综合
CiteScore
5.90
自引率
4.50%
发文量
36
审稿时长
>12 weeks
期刊介绍: Boreas has been published since 1972. Articles of wide international interest from all branches of Quaternary research are published. Biological as well as non-biological aspects of the Quaternary environment, in both glaciated and non-glaciated areas, are dealt with: Climate, shore displacement, glacial features, landforms, sediments, organisms and their habitat, and stratigraphical and chronological relationships. Anticipated international interest, at least within a continent or a considerable part of it, is a main criterion for the acceptance of papers. Besides articles, short items like discussion contributions and book reviews are published.
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