Salt-marsh reconstructions of relative sea-level change in the North Atlantic during the last 2000 years
Salt-marsh reconstructions of relative sea-level change in the North Atlantic during the last 2000 years
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DOI：
10.1016/j.quascirev.2014.06.008
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发表时间：
2014-09-01
影响因子：
4
通讯作者：
Scaife, Rob G.
中科院分区：
文献类型：
--
作者：
Barlow, Natasha L. M.;Long, Antony J.;Scaife, Rob G.
海平面的变化记录了冰盖和高山冰川的物质平衡的变化，以及动态的海洋-大气过程。要在全新世晚期的时间尺度上揭示这些机制的作用，理想情况下需要在一个或多个海洋的几个海岸的许多地点进行观测。我们提出了第一个2000年的基于盐沼泽的相对海平面（RSL）变化的连续重建，来自北大西洋东部和缓慢上升的海岸线。我们从苏格兰西北部的两个地点开发了三个RSL历史，以测试海平面趋势的区域变化（积极趋势表明海洋条件的接近性增加，消极趋势相反），同时强调方法学问题，包括将传递函数应用于化石盐沼泽序列时的数据集噪声问题。这些记录表明，在过去两千年中，RSL一直保持稳定（+/-0.4 m），并且在大部分记录长度中，区域海平面趋势一直是负的。最近，所有三个记录的生物地层学的变化表明了一个区域性的积极趋势，这意味着我们不能否认20世纪苏格兰西北部海平面加速的假设，它一定超过了背景RSL下降的速度（-0.4毫米/年（-1）），但这个信号似乎很微弱，而且比北大西洋西部记录的要晚。(C) 2014 Elsevier Ltd.版权所有。
Sea-level changes record changes in the mass balance of ice sheets and mountain glaciers, as well as dynamic ocean-atmosphere processes. Unravelling the contribution of each of these mechanisms on Late Holocene timescales ideally requires observations from a number of sites on several coasts within one or more oceans. We present the first 2000 year-long continuous salt marsh-based reconstructions of relative sea-level (RSL) change from the eastern North Atlantic and uniquely from a slowly uplifting coastline. We develop three RSL histories from two sites in north west Scotland to test for regional changes in sea-level tendency (a positive tendency indicating an increase in the proximity of marine conditions and a negative tendency the reverse), whilst at the same time highlighting methodological issues, including the problems of dataset noise when applying transfer functions to fossil salt-marsh sequences. The records show that RSL has been stable (+/-0.4 m) during the last two millennia, and that the regional sea-level tendency has been negative throughout most of the record lengths. A recent switch in the biostratigraphy of all three records, indicating a regional positive tendency, means we cannot reject the hypothesis of a 20th century sea-level acceleration occurring in north west Scotland that must have exceeded the rate of background RSL fall (-0.4 mm yr(-1)), but this signal appears muted and later than recorded from the western North Atlantic. (C) 2014 Elsevier Ltd. All rights reserved.