Late Holocene seasonal temperature variability of the western Scottish shelf (St Kilda) recorded in fossil shells of the bivalve Glycymeris glycymeris
Late Holocene seasonal temperature variability of the western Scottish shelf (St Kilda) recorded in fossil shells of the bivalve Glycymeris glycymeris
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双壳类 Glycymeris glycymeris 化石壳中记录的苏格兰西部陆架（圣基尔达）全新世晚期季节性温度变化
DOI：
10.1016/j.palaeo.2020.110146
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Alexandroff S
中科院分区：
文献类型：
--
作者：
Alexandroff S
北大西洋和邻近的陆架海在全球气候中起着至关重要的作用。为了更好地限制该区域的长期自然变化和海洋-陆地联系，需要建立一个来自开阔洋和大陆架的高分辨率海洋档案网络。近几十年来，双壳类硬年代学已成为一个领域，提供这样的记录，从中到高纬度。2014年5月，在苏格兰圣基尔达收集了双壳类Glycymeris glycymeris的死瓣和年轻活标本。利用距今3910-3340 cal/yr的贝壳化石和放射性碳，建立了一个187年的浮动年代学，其概率密度聚类为约100 -3340 cal/yr。3700-3500 cal年BP。从5个化石和3个现代标本中获得的亚年度δ 18 O数据显示，在两个时间间隔内都有很强的季节性信号。生长季节为G.今天，在这个位置的糖基化从5月持续到10月，大部分生长发生在8月的温度高峰之前。因此，现代标本和化石年表代表了春末和夏季的海面温度（SST）。化石贝壳的年温差为4.4 °C，与今天观测到的温差（3.8 °C）相似。从化石贝壳重建的平均SST比2003-2013 CE低1 °C，与世纪早期相似。浮动年表的放射性碳年龄与不列颠群岛气候向更潮湿条件的转变以及冰岛南部古海洋学记录中观察到的寒冷间隔相吻合。然而，我们的数据没有提供证据的冷间隔在苏格兰大陆架上。化石和现代标本在生长季节和温度范围上的相似性归因于与今天相比，第四个千年BP的边界条件相似。
The North Atlantic Ocean and adjacent shelf seas play a crucial role in global climate. To better constrain long-term natural variability and marine-terrestrial linkages in this region, a network of highly resolved marine archives from the open ocean and continental shelves is needed. In recent decades, bivalve sclerochronology has emerged as a field providing such records from the mid- to high latitudes. In May 2014, dead valves and young live specimens of the bivalveGlycymeris glycymeriswere collected at St Kilda, Scotland. A floating chronology spanning 187 years was constructed with fossil shells and radiocarbon dated to 3910–3340 cal yr before present (BP), with a probability density cluster at ca. 3700–3500 cal yr BP. Sub-annual δ18O data were obtained from five fossil and three modern specimens and showed a strong seasonal signal in both time intervals. The growth season ofG. glycymerisat this location today lasts from May to October, with most growth occurring before the temperature peak in August. Thus, the modern specimens and the fossil chronology represent late-spring and summer sea surface temperatures (SST). The annual temperature range was 4.4 °C in the fossil shells, which is similar to the range observed today (3.8 °C). Average SSTs reconstructed from the fossil shells were 1 °C cooler than in 2003–2013 CE and similar to the early 20th century CE. The radiocarbon age of the floating chronology coincides with a climatic shift to wetter conditions on the British Isles and with a cold interval observed in palaeoceanographic records from south of Iceland. However, our data do not provide evidence of a cold interval on the Scottish shelf. The similarity in growth season and temperature range between the fossil and modern specimens are attributed to similar boundary conditions in the fourth millennium BP compared to today.
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影响因子：
--
作者：
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DOI：
--
发表时间：
1991
期刊：
影响因子：
--
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A. Elliott;T. Clarke;Z. Li
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Z. Li
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DOI：
10.1144/gsl.sp.1996.111.01.13
发表时间：
1996
期刊：
Geological Society, London, Special Publications
影响因子：
--
作者：
William E. N. Austin;D. Kroon
通讯作者：
D. Kroon
全球海水三角洲氧 18 数据库的一部分，参考 Epstein 1953
DOI：
--
发表时间：
2001
期刊：
影响因子：
--
作者：
S. Epstein;T. Mayeda
通讯作者：
T. Mayeda
DOI：
10.1016/j.palaeo.2013.05.029
发表时间：
2013-09
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
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作者：
D. Reynolds;P. Butler;Siobhan Williams;J. Scourse;C. Richardson;A. Wanamaker;W. Austin;A. Cage;M. Sayer
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D. Reynolds;P. Butler;Siobhan Williams;J. Scourse;C. Richardson;A. Wanamaker;W. Austin;A. Cage;M. Sayer