Holocene sea-level database from the Atlantic coast of Europe
Holocene sea-level database from the Atlantic coast of Europe
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DOI：
10.1016/j.quascirev.2018.07.031
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发表时间：
2018-04
影响因子：
4
通讯作者：
Ane García-Artola;P. Stéphan;A. Cearreta;Robert E Kopp;N. Khan;B. Horton
中科院分区：
文献类型：
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作者：
Ane García-Artola;P. Stéphan;A. Cearreta;Robert E Kopp;N. Khan;B. Horton
高质量的相对海平面(RSL)数据揭示了全新世期间地壳运动的空间和时间变化，这些数据被用于许多应用，从校准地球流变学和冰盖重建模型到沿海低地的发展和人类占领。在这里，我们提供了一个全新世的欧洲大西洋沿岸(ACE)的RSL数据库，并使用时空经验分层模型从ACE数据库中估计了RSL的变化速率。该数据库包含214个索引点，它们定位RSL在空间和时间上的位置，以及126个限制日期，它们将RSL限制在特定时间点的特定海拔之上或以下。时间分布从现在一直延伸到∼11.5ka，只有42个指标点的年龄大于7ka。从法国佛兰德斯到葡萄牙阿尔加维，其空间分布范围为1,700 千米，超过一半的索引点集中在法国沿海。全新世早期的RSL变化率最高，葡萄牙中部为6.8Ka± 0.5 mm yr−1，法国南部为6.3ka± ± 0.8Ka mm mm yr−1。中晚全新世的速率随着时间的推移而下降，从4ka到现在，法国中部的速率为0.9 ± 0.4 mm yr−1，葡萄牙中部的速率为0.1 ± 0.5 mm yr−1。将RSL数据与冰川均衡调整模式的输出进行比较，表明英国-爱尔兰冰盖和芬诺斯坎迪亚冰盖的消融主导了ACE数据库捕获的大尺度变化，这反映了在∼4ka之后从东北向西北迁移的崩塌的不列颠-爱尔兰冰盖和芬诺斯坎迪亚外围前隆起的影响减弱。
High-quality relative sea-level (RSL) data reveal spatial and temporal variations in crustal movements during the Holocene, which are used for many applications, ranging from calibrating models of earth rheology and ice sheet reconstructions to the development of coastal lowlands and human occupation. Here, we present a Holocene RSL database for the Atlantic coast of Europe (ACE) and estimate rates of RSL change from the ACE database using a spatio-temporal empirical hierarchical model. The database contains 214 index points, which locate the RSL position in space and time, and 126 limiting dates, which constrain RSL to above or below a certain elevation at a specific point in time. The temporal distribution extends from present to ∼11.5 ka, with only 42 index points older than 7 ka. The spatial distribution spans 1700 km from French Flanders (France) to Algarve (Portugal), with more than half of the index points concentrated along the French coast.The ACE database shows RSL was below present during the Holocene. Rates of RSL change were highest during the early Holocene, ranging between 6.8 ± 0.5 mm yr−1in middle Portugal and 6.3 ± 0.8 mm yr−1in southern France from 10 to 7 ka. Mid-to late-Holocene rates decreased over time with rates ranging between 0.9 ± 0.4 mm yr−1in middle France and 0.1 ± 0.5 mm yr−1in middle Portugal from 4 ka to present. Comparison of the RSL data to output from a glacial-isostatic adjustment model suggests that deglaciation of the British-Irish and Fennoscandian Ice Sheets dominates the large-scale variability captured by the ACE database, which reflects a decreasing influence of the collapsing British-Irish and Fennoscandian peripheral forebulge that migrated from the northeast to the northwest after ∼4 ka.