Sea surface slope as a proxy for Agulhas Current strength
Sea surface slope as a proxy for Agulhas Current strength
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DOI：
10.1029/2010gl042847
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发表时间：
2010-05
影响因子：
5.2
通讯作者：
E. van Sebille;L. Beal;A. Biastoch
中科院分区：
文献类型：
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作者：
E. van Sebille;L. Beal;A. Biastoch
利用1/10°分辨率的区域海洋数值模式，研究了名义纬度34°S的阿古拉海流强度与横跨海流的海平面高度异常梯度之间的线性关系。我们的结果表明，一旦使用现场传输测量对海流强度进行了校准，就可以使用高度计数据以合理的精度估计海流强度。三年的运输量测量提供了最坏情况相关性R=0.78的校准。在这种情况下，代理传输中的误差具有9.8 Sv的标准偏差，而传输时间序列本身的标准偏差为20.2Sv。根据这些结果，我们得出结论，阿古拉海流时间序列(ACT)实验的设计，即在阿古拉海流和TOPEX/Jason高度计地面轨道上部署系泊设备，为期三年，可能会产生质量良好的阿古拉海流强度的多十年时间序列。
The linear relation between the strength of the Agulhas Current at nominal latitude 34°S and the gradient in sea level height anomaly across the current is investigated in a 1/10° resolution regional numerical ocean model. Our results show that the strength of the current can be estimated with reasonable accuracy using altimeter data, once it has been calibrated using in‐situ transport measurements. Three years of transport measurements provide a calibration with worst‐case correlation R = 0.78. In that case the errors in proxy transport have a standard deviation of 9.8 Sv, compared to a 20.2 Sv standard deviation of the transport time series itself. From these results we conclude that the design of the Agulhas Current Timeseries (ACT) experiment, a three‐year deployment of moorings across the Agulhas Current and along a TOPEX/Jason altimeter ground track, will likely produce a good quality multi‐decadal time series of Agulhas Current strength.