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Statistical analysis of Lagrangian transport of subtropical waters in the Japan Sea based on AVISO altimetry data

机译：基于AVISO测高数据的日本海拉格朗日亚热带水域运输统计分析

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摘要

Northward near-surface Lagrangian transport of subtropical waters in the Japan Sea frontal zone is simulated and analysed based on altimeter data for the period from 2?January?1993 to 15?June?2015. Computing different Lagrangian indicators for a large number of synthetic tracers launched weekly for 21?years in the southern part of the Sea, we find preferred transport pathways across the Subpolar Front. This cross-frontal transport is statistically shown to be meridionally inhomogeneous with qgates/q and qbarriers/q whose locations are determined by the local advection velocity field. The gates qopen/q due to suitable dispositions of mesoscale eddies facilitating propagation of subtropical waters to the north. It is documented for the western, central and eastern gates with the help of different kinds of Lagrangian maps and verified by some tracks of available drifters. The transport through the gates occurs by a portion-like manner, i.e. subtropical tracers pass the gates in specific places and during specific time intervals. There are some qforbidden/q zones in the frontal area where the northward transport has not been observed during all the observation period. They exist due to long-term peculiarities of the advection velocity field.
机译：基于1993年1月2日至2015年6月15日期间的高度计数据，模拟和分析了日本海额带中亚热带水的北向近地表拉格朗日运移。通过计算每周在海洋南部发射的大量合成示踪剂的不同拉格朗日指标，历时21年，我们发现了穿越亚极锋的首选运输途径。据统计，这种跨正面运输与门和障碍的子午线不均匀，其位置由局部对流速度场确定。由于中尺度涡流的适当布置，闸门打开，有利于亚热带水域向北扩散。在不同种类的拉格朗日地图的帮助下，已为西，中和东大门记录了该文件，并通过了一些可用的漂流器进行了验证。通过门的传输以类似部分的方式发生，即亚热带示踪剂在特定位置和特定时间间隔内通过门。在额叶区域中有一些禁止区域，在整个观察期中都没有观察到向北的运输。它们的存在是由于对流速度场的长期特殊性。

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