Sea Surface Height Signals as Indicators for Oceanic Meridional Mass Transports
Sea Surface Height Signals as Indicators for Oceanic Meridional Mass Transports
复制标题
海面高度信号作为海洋经向质量传输的指标
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
D. Cromwell
中科院分区：
文献类型：
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作者：
J. Hirschi;P. Killworth;J. Blundell;D. Cromwell
利用数值模式检验海面高度（SSH）是否可以作为海洋环流的指示器。
大西洋纬向海洋质量输送的变化。结果表明，如果通过
西部边界流区和东部边界流区是分开考虑的，
高空纬向SSH差异与高空纬向输送之间的相关系数为0.3-0.9
1100米与地表相对应的流域范围内的输送相关性要弱得多
日冕翻转环流（MOC）的分支。对于东部和西部的分支机构，
输送，结合SSH信号和Rossby波理论得到的斜压结构
能够计算顶部1100 m的输送变化的定量估计。的结果
方法对于MOC的可变性不太令人信服。这是因为即使是很小的相对误差
东支和西支的变异性与主成分变异性相比可以是大的。这些
误差投射到东部和西部输送的总和上，因此投射到地面的分支上。
MOC。然而，能够从东、西部的SSH信号推断输送异常，
在解释来自英国的MOC观测时可能会有用。自然环境
研究理事会快速气候变化（RAPID）系泊阵列在268 N，这表明一个大的亚年度
变化主要是由于西部边界的变化。从SSH推断的传输可能会有所帮助
以确定这种变化的起源以及输送异常是否传播到西部边界
从盆地内部或从其他纬度。
Numerical models are used to test whether the sea surface height (SSH) can be used as an indicator for the
variability of Atlantic meridional oceanic mass transports. The results suggest that if the transports over the
western boundary current region and those in the eastern part of the basin are considered separately, significant
correlations (0.3–0.9) are found between zonal SSH differences and the meridional transports in the top
1100 m. Much weaker correlations are found for the basinwide transport, which corresponds to the surface
branch of the meridional overturning circulation (MOC). For the eastern and western branches of the meridional
transport, combining the SSH signal with the baroclinic structure obtained from Rossby wave theory
enables calculation of a quantitative estimate of the transport variability in the top 1100 m. The results of the
method are less convincing for the variability of the MOC. The reason for this is that even small relative errors
in the variability of the eastern and western branches can be large compared with the MOC variability. These
errors project onto the sum of the eastern and western transports and therefore onto the surface branch of the
MOC. Nevertheless, being able to infer transport anomalies from SSH signals in the eastern and western parts
of the Atlantic might prove useful in interpreting MOC observations from the U.K. Natural Environment
Research Council Rapid Climate Change (RAPID) mooring array at 268N, which show a large subannual
variability that is mainly due to changes at the western boundary. Transports inferred from the SSH could help
to identify the origin of this variability and whether transport anomalies propagate into the western boundary
region from the basin interior or from other latitudes.
影响因子：
5.2
作者：
Bingham, Rory J.;Hughes, Chris W.;Williams, Richard G.
通讯作者：
Williams, Richard G.