On the ocean salinity stratification observed at the eastern edge of the equatorial Pacific warm pool
On the ocean salinity stratification observed at the eastern edge of the equatorial Pacific warm pool
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DOI：
10.1029/2007jc004297
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发表时间：
2008-03
影响因子：
--
通讯作者：
C. Maes
中科院分区：
文献类型：
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作者：
C. Maes
[1]在专门研究赤道太平洋暖池东缘锋区的一系列三次海洋学航行中收集的观测资料被用来研究盐度在海洋上层静态分层中的作用。结合物理和地球化学资料，可以准确地确定157.5°E ~ 173.4°E之间的锋区位置。由于只考虑一个参数可能导致不确定性，因此需要采用多参数方法。在次表层，锋区周围的温盐结构揭示了等温层内海洋盐度分层的主导作用。然而，实际的方法来确定盐度屏障层的厚度不能详细分离不同的动态制度附近的锋区和另一个变量，以确定盐度的作用，在静态垂直分层，然后提出和测试的几个数据集。这种方法考虑到热量和盐的依赖性，在布伦特-维萨拉频率，以隔离的具体作用，盐度分层的层以上的主温跃层。结果表明，赤道西太平洋的盐度层结具有东西向梯度增大的特征，而在暖池东缘向西的区域盐度层结强度较大。这一诊断，然后提供的基础上，检查的动力学机制参与形成的盐度分层。这也证实了海洋盐度在赤道太平洋暖池变化中的重要性。潜在的重要影响厄尔尼诺南方涛动的变化进行了讨论。
[1] The observations collected during a series of three oceanographic cruises dedicated to the study of the frontal zone at the eastern edge of the equatorial Pacific warm pool are used to study the role of salinity in the static stratification of the ocean upper layers. By combining physical and biogeochemical data, the position of the frontal zone at the surface could be accurately determined between 157.5°E and 173.4°E. A multiparameter approach is required due to the uncertainty that may result when one parameter is only considered. In the subsurface the thermohaline structures around the frontal zone reveal the predominant role of the ocean salinity stratification within the isothermal layers. However, the actual methods to determine the salinity barrier layer thickness cannot separate in detail the different dynamical regimes near the frontal zone and another variable to identify the role of the salinity in the static vertical stratification is then proposed and tested on several data sets. This method takes into account the thermal and the saline dependencies in the Brunt-Vaisala frequency in order to isolate the specific role of the salinity stratification in the layers above the main thermocline. The results show that the equatorial western Pacific is characterized by an increasing east-west gradient in salinity stratification whereas the stronger values are found westward of the eastern edge of the warm pool. This diagnostic then provides the basis for an examination of the dynamical mechanisms involved in the formation of the salinity stratification. It also confirms the importance of the ocean salinity in the variability of the equatorial Pacific warm pool. The potentially important implications for the El Nino-Southern Oscillation variability are discussed.