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首页> 外文期刊>Journal of Physical Oceanography >Generation and Initial Evolution of a Mode Water θ-S Anomaly
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Generation and Initial Evolution of a Mode Water θ-S Anomaly

机译：模式水θ-S异常的产生和初始演化

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摘要

Generation and evolution of an isopycnal potential temperature-salinity (θ-S), or spiciness, anomaly is studied around 20°-23°S, 110°W in the austral winter of 2004. Two profiling CTD floats deployed in the region in January 2004 provide the observations. The anomaly (defined as relative to water properties of the preceding summer) is very large (initially about 0.35 in S and about 0.9℃ in θ). It is associated with the winter ventilation of a thick, low-potential-vorticity layer known as South Pacific Eastern Subtropical Mode Water. Regional lateral θ and S distributions at the surface predispose the ocean to formation of this water mass and allow significant anomalies to be generated there with relative ease. The water mass is potentially important for climate in that, after northwestward advection in the South Equatorial Current, it contributes to the Equatorial Undercurrent and eventually resurfaces in the cold tongue of the eastern equatorial Pacific Ocean. The anomaly studied is strong enough to predispose a portion of the water column to salt fingering, increasing vertical mixing. Although lateral processes are no doubt important in evolution of the anomaly, the vertical mixing appears to be sufficiently vigorous to reduce it significantly within 6 months after its formation by spreading it to denser horizons through diapycnal fluxes. By that time the anomaly is most likely sufficiently diffuse so that subsequent evolution from diapycnal fluxes is significantly reduced as it makes its way toward the equator.
机译：在2004年南半球20°-23°S，110°W附近研究了等温潜在盐度（spiness）异常的产生和演化。一月份在该地区部署了两个剖面CTD浮标2004年提供的意见。异常（定义为相对于前一个夏季的水的性质）非常大（S最初约0.35，θ最初约0.9℃）。它与厚厚的低势涡层的冬季通风有关，被称为南太平洋东部亚热带模式水。地表的区域横向θ和S分布使海洋容易形成这种水团，并允许相对容易地在该处产生明显的异常。水质对气候具有潜在的重要意义，因为在南赤道洋流向西北平流之后，它导致了赤道暗流，并最终在赤道东太平洋的冷舌处重新出现。所研究的异常强度足以使一部分水柱易受盐指影响，从而增加了垂直混合。尽管横向过程无疑对异常的发展很重要，但垂直混合似乎足够有力，可以在其形成后的6个月内通过将其通过透水通量扩散到更密实的地层中而大大降低。到那个时候，异常现象很可能已经充分扩散，因此，随着水流通向赤道，随后从地磁通量的演变将大大减少。

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