Standing Eddies in the Meridional Overturning Circulation
Standing Eddies in the Meridional Overturning Circulation
复制标题
经向翻转环流中的驻涡
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
C. Eden
中科院分区：
文献类型：
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作者：
J. Viebahn;C. Eden
本文讨论了立涡在纬向翻转环流中的作用。时间平均等密纬向流函数被分解为时间和纬向平均部分、静止涡部分和瞬态涡部分。事实证明，一个等密度的MOC与一个完全消失的立涡部分的建设必须进行分区积分沿着深度依赖的水平等值线的时间平均密度。相反，沿沿着时间平均地转流线的纬向积分通常只导致具有减少的立涡部分的等密度MOC。本文给出了由两个示踪剂场构造纬向输运流函数的一般方法和消除相应的立涡部分的一般方法，并利用一个理想化的南大洋模式的结果，证明了忽略纬向积分路径的深度依赖，沿沿着密度等值线或地转流线积分是一种有效的方法。
AbstractThe role of standing eddies for the meridional overturning circulation (MOC) is discussed. The time-mean isopycnal meridional streamfunction is decomposed into a time- and zonal-mean part, a standing-eddy part, and a transient-eddy part. It turns out that the construction of an isopycnal MOC with an exactly vanishing standing-eddy part has to be performed by zonal integration along depth-dependent horizontal isolines of time-mean density. In contrast, zonal integration along time-mean geostrophic streamlines generally only leads to an isopycnal MOC with a reduced standing-eddy part. A generalized approach of constructing meridional transport streamfunctions by two tracer fields and the generalized way to neutralize the corresponding standing-eddy part is given to summarize the discussion.Using the results of an idealized Southern Ocean model, it is demonstrated that neglecting the depth dependence of the zonal integration paths by integrating along density contours or geostrophic streamlines of a ...