The importance of non-tidal water-level variability for reconstructing Holocene relative sea level

The importance of non-tidal water-level variability for reconstructing Holocene relative sea level
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非潮汐水位变化对于重建全新世相对海平面的重要性

DOI:
10.1016/j.quascirev.2022.107637
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发表时间:
2022
影响因子:
4
通讯作者:
Piecuch, Christopher G.
Piecuch, Christopher G.
中科院分区:
地球科学1区
文献类型:
--
作者:
Kemp, Andrew C.;Shaw, Timothy A.;Piecuch, Christopher G.

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盐沼沉积物是重建全新世相对海平面的重要地质档案。这些重建的垂直不确定性通常被量化为与潮差成比例,从而导致产生精确记录的小潮区的假定首要地位。我们分析了1983-2001年美国大西洋沿岸43个验潮站每小时的水位预测和测量结果,以量化(1)海拔(相对于潮汐基准面)和洪水持续时间之间的关系;(2)天文潮汐和非潮汐(气象、水文和海洋)过程的相对重要性。在天文潮汐较小的地区,非潮汐过程更有可能对水位产生较大的影响,而在潮汐较大的地区,这种影响不大。在一些微潮区(例如,切萨皮克湾),RSL重建的精度可能被高估,而在潮差较大的地区(例如,缅因州湾)它可能被低估了。采用洪水频率而不是预测的天文基准作为盐沼分布的上限可能会减少这种偏差。相对海平面重建往往假设恒定的潮差通过时间,但在一些微潮区,这一假设应扩大到明确描述额外的非潮汐贡献的平稳性。
Salt-marsh sediment is an important geological archive for reconstructing Holocene relative sea level. The vertical uncertainty of these reconstructions is usually quantified as proportional to tidal range, resulting in a presumed primacy of microtidal regions for generating precise records. We analyzed hourly water-level predictions and measurements over 1983–2001 from 43 tide gauges on the U.S. Atlantic coast to quantify the (1) relationship between elevation (relative to tidal datums) and duration of inundation; and (2) relative importance of astronomical tides and non-tidal (meteorological, hydrologic, and oceanographic) processes. Non-tidal processes are more likely to exert a proportionally large influence on water levels in regions with small astronomical tides, and less likely to do so where tides are large. In some microtidal regions (e.g., Chesapeake Bay), the precision of RSL reconstructions is likely overestimated, while in regions with large tidal range (e.g., Gulf of Maine) it may be underestimated. Adopting an inundation frequency rather than predicted astronomical datum for the upper limit of salt-marsh distribution may reduce this bias. Relative sea-level reconstructions often assume constant tidal range through time, but in some microtidal regions this assumption should be expanded to explicitly describe additional stationarity of non-tidal contributions.
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