Signature of the Atlantic meridional overturning circulation in sea level along the east coast of North America
Signature of the Atlantic meridional overturning circulation in sea level along the east coast of North America
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DOI：
10.1029/2008gl036215
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发表时间：
2009-01-20
影响因子：
5.2
通讯作者：
Hughes, Chris W.
中科院分区：
文献类型：
--
作者：
Bingham, Rory J.;Hughes, Chris W.
在这封信中，我们研究了北大西洋经向翻转环流（MOC）和北美东海岸沿着海平面（SL）之间的关系。在涡流允许的海洋模型OCCAM中，我们发现一个独特的，地形以下的模式SL的变化在北大西洋西部的MOC的变化强度密切相关，SL沿着美国东海岸下降2厘米对应于1 Sv增加MOC。我们在测高记录中发现了类似的SL变化模式，并表明在北纬40-50度之间的北美东海岸沿着验潮站，这种季节相干SL模式主导了SL的年际变化。因此，我们的结论是，北美沿海海平面可能确实是一个有用的指标MOC的年际时间尺度上的变化，允许基于观测的估计可能的范围内的年际MOC波动来确定。引用：Bingham，R. J.，和C. W. Hughes（2009），Signature of the Atlantic Chronological overlapping circulation in sea level沿着着east coast of North America，Geophys.保留信函：36，L02603，doi：10.1029/2008GL036215。
In this letter we examine the relationship between the North Atlantic Meridional Overturning Circulation (MOC) and sea level (SL) along the east coast of North America. In the eddy permitting ocean model OCCAM we find a distinctive, topography-following pattern of SL variability in the western North Atlantic that is closely linked with the changing strength of the MOC, with a 2 cm drop in SL along the US east coast corresponding to a 1 Sv increase in the MOC. We find a similar pattern of SL variability in the altimetry record and show that this meridionally coherent SL mode dominates interannual SL variability at tide gauges along the North American east coast between 40-50 degrees N. Hence we conclude that North American coastal sea-level may indeed be a useful indicator of MOC variability on interannual timescales, allowing an observationally-based estimate of the likely range of interannual MOC fluctuations to be determined. Citation: Bingham, R. J., and C. W. Hughes ( 2009), Signature of the Atlantic meridional overturning circulation in sea level along the east coast of North America, Geophys. Res. Lett., 36, L02603, doi: 10.1029/2008GL036215.