A 16 000-year record of near-field relative sea-level changes, northwest Scotland, United Kingdom
A 16 000-year record of near-field relative sea-level changes, northwest Scotland, United Kingdom
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英国苏格兰西北部 16000 年来近场相对海平面变化的记录
DOI：
10.1016/j.quaint.2004.10.015
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发表时间：
2005
影响因子：
2.2
通讯作者：
S. Woodroffe
中科院分区：
文献类型：
--
作者：
I. Shennan;Sarah Hamilton;Caroline Hillier;S. Woodroffe
隔离盆地，提高潮汐沼泽，沿海湿地和沙丘系统周围的Arisaig在苏格兰西北部产生的相对海平面（RSL）的变化，从当地冰消期后的最后一次盛冰期（LGM）的时间到现在的16000年的记录。Mointeach Mhor North的新的海平面指数点确定了中全新世RSL高水位的顶点为7600- 7400 calyrBP，高于现今6.74±0.2m。许多海平面指数点表明，在任何重大的RSL下降开始之前，RSL高水位持续了1000多年。这表明劳伦蒂德和南极冰盖的融化是逐渐停止的，而不是突然终止的。孤立盆地的证据，从现在的海洋界限34到38米，一直到接近当前海平面的地点，限制了在融水脉冲1a到30 mmyr-1或111 km 3 yr-1融水排放期间海平面上升的加速。RSL观测与冰川均衡调整（GIA）模型预测的比较表明，残差的模式依赖于所使用的GIA模型的差异。远场冰模型组件的变化可以部分解释残差的模式。
Isolation basins, raised tidal marshes, coastal wetlands and dune systems around Arisaig in northwest Scotland produce a ∼16000-year record of relative sea-level (RSL) change from the time of local deglaciation following the Last Glacial Maximum (LGM) to the present. New sea-level index points from Mointeach Mhor North define the culmination of the mid-Holocene RSL highstand to ∼7600–7400calyrBP and 6.74±0.2m above present. Numerous sea-level index points indicate that the RSL highstand persisted more than 1000 years before the onset of any significant RSL fall. This points to a gradual cessation of melting of the Laurentide and Antarctic ice sheets, rather than an abrupt termination. Isolation basin evidence, from a marine limit ∼34 to 38m above present down to sites close to current sea level, constrain the acceleration of eustatic sea-level rise during meltwater pulse 1a to ∼30mmyr−1or ∼11km3yr−1meltwater discharge. Comparison of RSL observations with glacial isostatic adjustment (GIA) model predictions show differences in the pattern of residuals dependent upon the GIA model used. Changes to the far-field ice model components can partly explain the patterns of residuals.