Variations in the difference between mean sea level measured either side of Cape Hatteras and their relation to the North Atlantic Oscillation

Variations in the difference between mean sea level measured either side of Cape Hatteras and their relation to the North Atlantic Oscillation
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哈特拉斯角两侧测量的平均海平面差异的变化及其与北大西洋涛动的关系

DOI:
10.1007/s00382-016-3464-1
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发表时间:
2016
期刊:
影响因子:
4.6
通讯作者:
Woodworth P
Woodworth P
中科院分区:
地球科学2区
文献类型:
--
作者:
Woodworth P

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我们认为,在北美大西洋海岸的哈特拉斯角两侧测量的平均海平面(MSL)的差异变化的程度,在北大西洋涛动(NAO)的波动所造成的海洋动力学变化的结果。从验潮站资料的分析,我们知道,在十年到世纪的时间尺度上,平均海平面差异和北大西洋涛动指数的变化是相关的,使一个尺度因子的平均海平面差异的变化,每单位的北大西洋涛动指数的变化进行估计。在过去的几个世纪里,NAO指数的趋势变化很小(当使用60-120年的窗口测量时)。因此,如果在这段时间内适用相同的比例因子,那么过去几个世纪中最高海拔差异趋势的相应变化也应该很小。因此,建议近几个世纪的海平面记录从盐沼(调整长期的垂直陆地运动)应具有基本相同的NAO驱动的趋势南部和北部的哈特拉斯角,不同的是由于其他过程的贡献,如在经向翻转环流或“地球物理指纹”的变化。在过去的几个世纪里,甚至在过去的一千年里,盐沼的数据在其不确定性中显然支持这种解释。建议如何获得更大的洞察力,通过获取更多的测量和改进的海平面响应风沿着架的模型。
We consider the extent to which the difference in mean sea level (MSL) measured on the North American Atlantic coast either side of Cape Hatteras varies as a consequence of dynamical changes in the ocean caused by fluctuations in the North Atlantic Oscillation (NAO). From analysis of tide gauge data, we know that changes in MSL-difference and NAO index are correlated on decadal to century timescales enabling a scale factor of MSL-difference change per unit change in NAO index to be estimated. Changes in trend in the NAO index have been small during the past few centuries (when measured using windows of order 60–120 years). Therefore, if the same scale factor applies through this period of time, the corresponding changes in trend in MSL-difference for the past few centuries should also have been small. It is suggested thereby that the sea level records for recent centuries obtained from salt marshes (adjusted for long-term vertical land movements) should have essentially the same NAO-driven trends south and north of Cape Hatteras, only differing due to contributions from other processes such as changes in the Meridional Overturning Circulation or ‘geophysical fingerprints’. The salt marsh data evidently support this interpretation within their uncertainties for the past few centuries, and perhaps even for the past millennium. Recommendations are made on how greater insight might be obtained by acquiring more measurements and by improved modelling of the sea level response to wind along the shelf.
大西洋数十年振荡的 ENSO 分量及其与北大西洋年际沿海海平面异常的关系
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