Marine Radiocarbon Reservoir Ages in Scottish Coastal and Fjordic Waters
Marine Radiocarbon Reservoir Ages in Scottish Coastal and Fjordic Waters
复制标题
DOI：
10.1017/s0033822200035372
复制
发表时间：
2006
期刊：
影响因子：
8.3
通讯作者：
A. Cage;J. Heinemeier;W. Austin
中科院分区：
文献类型：
--
作者：
A. Cage;J. Heinemeier;W. Austin
苏格兰海湾（峡湾）的大量淡水输入加上海湾盆地水与大西洋沿海水团之间的有限交换可能会导致这些环境中区域海洋放射性碳库年龄（R[t]）缩短。为了检验这一假设，对公元 1950 年之前已知日期从苏格兰西北部沿海地区现场收集的博物馆存档的历史贝壳进行了 14C 测年，以提供确定 R(t) 的方法，从而提供确定与模拟的全球表面海洋水库年龄 (R) 的区域偏差 (ΔR) 的方法。海湾数据与苏格兰西海岸的 14C 日期相结合（Harkness 1983），得出区域 ΔR 值为 -26 ± 14 年。苏格兰西北部海湾和沿海水域的 ΔR 在统计上与英国沿海水域报告的 17 ± 14 年的 ΔR 值（Reimer 2005；Harkness 1983 之后的数据）存在统计差异（置信水平 >95%），并且与 Reimer 等人报告的 -33 ± 93 年的沿海 ΔR 值非常一致。 （2002）。因此，建议对苏格兰西北海岸的现代（即爆炸前而非史前）海洋 14C 日期应用−26 ± 14 年的区域 ΔR 修正。
High freshwater inputs into Scottish sea lochs (fjords) combined with the restricted exchange between sea loch basin water and coastal Atlantic water masses are likely to result in reduced regional marine radiocarbon reservoir ages (R[t]) in these environments. To test this hypothesis, historical, museum-archived shells, collected live on known dates prior to AD 1950 from coastal locations in NW Scotland, were 14C dated to provide a means of determining R(t) and hence the regional deviation (ΔR) from the modeled global surface ocean reservoir age (R). The sea loch data, when combined with 14C dates from the Scottish west coast (Harkness 1983), yield a regional ΔR value of −26 ± 14 yr. The ΔR of sea loch (fjordic) and coastal waters of NW Scotland are statistically different (at a confidence level >95%) from the ΔR value of 17 ± 14 yr reported for UK coastal waters (Reimer 2005; data after Harkness 1983) and are in good agreement with the coastal ΔR value of −33 ± 93 yr reported by Reimer et al. (2002). Therefore, it is recommended that a regional ΔR correction of −26 ± 14 yr should be applied to modern (i.e. pre-bomb but not prehistoric) marine 14C dates from the NW coast of Scotland.