Water Mass Variability in the Western North Pacific Detected in a 15-Year Eddy Resolving Ocean Reanalysis
Water Mass Variability in the Western North Pacific Detected in a 15-Year Eddy Resolving Ocean Reanalysis
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DOI：
10.1007/s10872-009-0063-3
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发表时间：
2009-12-01
影响因子：
2.3
通讯作者：
Komatsu, Kosei
中科院分区：
文献类型：
--
作者：
Miyazawa, Yasumasa;Zhang, Ruochao;Komatsu, Kosei
本文介绍了日本沿海海洋可预测性实验2（JCOPE2）的海洋预测系统对北太平洋西部水质量和电流的可变性进行重新分析，以提供有关数据用户质量的基本描述和信息。我们创建了重新分析数据，高度水平分辨率为1/12度，以描述与1993年至2007年之间的Kuroshio-Kuroshio扩展，Ovashio和中尺度涡流相关的海洋变异性。结合三维变异数据同化很好地再现了北太平洋西部的平均水量特性以及黑鲁西奥 - 库鲁希奥扩展的年际变化和Oyashio沿海分支。从重新分析数据中，我们发现，在第一个蜿蜒的波峰和Ovashio沿海分支的首个蜿蜒的山峰和南方侵入时，黑鲁希奥延伸轴的平均动能都与Oyashio水的水平分布和北太平洋中间水的水平分布密切相关。适当的年际时间尺度。重新分析的数据还表明，与其政权转变相关的黑发延伸的南北迁移影响了黑果延长的再循环循环中亚热带模式形成的际调节。
This paper describes a reanalysis of the variability of water mass properties and currents in the western North Pacific using an ocean forecast system, Japan Coastal Ocean Predictability Experiment 2 (JCOPE2), to provide the basic description and information about the quality for data users. We have created the reanalysis data with high horizontal resolution of 1/12 degrees to describe the oceanic variability associated with the Kuroshio-Kuroshio Extension, the Ovashio, and the mesoscale eddies from 1993 to 2007. The products made by an eddy-resolving ocean model combined with the three-dimensional variational data assimilation well reproduced the mean water mass property in the western North Pacific and the interannual variations of the Kuroshio-Kuroshio Extension and the Oyashio coastal branch. From the reanalysis data, we found that both the mean kinetic energy of the Kuroshio Extension axis at the first meandering crest and southward intrusion of the Ovashio coastal branch were closely related with the horizontal distribution of both the Oyashio Water and North Pacific Intermediate Water within the appropriate interannual time scale. The reanalysis data also indicated that the north-south migration of the Kuroshio Extension associated with its regime transitions affected the decadal modulation of the Subtropical Mode Water formation in the recirculation gyre of the Kuroshio Extension.