Seasonal temperature variation below the thermocline detected by Argo floats
Seasonal temperature variation below the thermocline detected by Argo floats
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DOI：
10.1029/2006gl026070
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发表时间：
2006-07-12
影响因子：
5.2
通讯作者：
Shikama, Nobuyuki
中科院分区：
文献类型：
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作者：
Hosoda, Shigeki;Minato, Shinya;Shikama, Nobuyuki
Argo剖面浮标探测到温跃层以下强烈的季节性温度变化。这种变化与长斜压Rossby波有关。研究结果表明，在1000 - 2000 dbar的压力下，不仅在海盆边界区或深对流区，而且在海洋内部，都能捕捉到季节信号。观察到清晰的向西传播信号。相速度与理论推导的速度具有相同的量级。在温跃层以下，强信号区潜在密度变化的经验正交函数分析的第一模式显示出明显的季节变化。即使在中层，温度异常的幅度在1200 dbar时为0.05 - 0.12 ℃，相当于WOA 01的年标准偏差。这些结果是使用Argo观测提供的密集空间和时间分布获得的。
Strong seasonal temperature variation below the thermocline is detected by Argo profiling floats. The variation is associated with a long baroclinic Rossby wave. The results of this study show that seasonal signals can be captured at 1000 - 2000 dbar not only in basin boundary regions or deep convection regions but also in the interior ocean. A clear, westward propagation signal is observed. The phase speed is of the same order as a theoretically derived speed. Below the thermocline, the first mode of empirical orthogonal function analysis of potential density variations in the strong signal region shows a clear seasonal variation. Even in the middle layer, the amplitude of the temperature anomaly is 0.05 - 0.12 degrees C at 1200 dbar, which is equivalent to the annual standard deviation from the WOA01. These results are obtained using the dense spatial and temporal distributions provided by the Argo observations.