Frontogenesis and frontolysis of the subpolar front in the surface mixed layer of the Japan Sea
Frontogenesis and frontolysis of the subpolar front in the surface mixed layer of the Japan Sea
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DOI：
10.1002/2013jc009419
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发表时间：
2014-02
影响因子：
--
通讯作者：
N. Zhao;A. Manda;Zhen Han
中科院分区：
文献类型：
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作者：
N. Zhao;A. Manda;Zhen Han
使用最先进的海洋再分析数据研究了日本海表面混合层中副极锋（SPF）的锋生和锋解过程。 SPF 从 1 月到 9 月经历了 9 个月的减弱期，并在 10 月转为增强期。我们的分析表明，水平平流始终有助于 SPF 的增强。 9月以后，随着地表热通量减弱效应减弱，水平平流成为导致SPF强度变化的主导因素。由此，SPF进入3个月的强化期。水平平流的地转分量对加强 SPF 做出了最重要的贡献，可以全年增强 SPF。埃克曼平流也促进了 SPF 的增强，贡献虽小但仍然很重要。在弱化期间，SPF强度很大程度上受热通量控制。热通量尤其是短波辐射分量是夏季地表锋面消失的主要原因。
The frontogenesis and frontolysis processes of the subpolar front (SPF) in the surface mixed layer of the Japan Sea are investigated using state-of-the-art oceanic reanalysis data. The SPF experiences a 9 month weakening period from January to September, which shifts to a strengthening period in October. Our analysis shows that horizontal advection consistently contributes to the intensification of the SPF. After September, as the weakening effect of surface heat flux diminishes, horizontal advection becomes the dominant factor that contributes to changes in the SPF strength. Thus, the SPF enters a 3 month strengthening period. The geostrophic component of horizontal advection provides the most important contribution to strengthening the SPF, acting to intensify the SPF year-round. Ekman advection also promotes SPF strengthening with a smaller but still important contribution. During the weakening period, SPF strength is largely controlled by heat flux. The heat flux, especially the shortwave radiation component, is the primary cause of the surface front disappearance in the summer.