Interannual to Decadal Variability of the Upper-Ocean Heat Content in the Western North Pacific and Its Relationship to Oceanic and Atmospheric Variability
Interannual to Decadal Variability of the Upper-Ocean Heat Content in the Western North Pacific and Its Relationship to Oceanic and Atmospheric Variability
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DOI：
10.1175/jcli-d-17-0506.1
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发表时间：
2018-06
影响因子：
4.9
通讯作者：
H. Na;kwang-yul kim;S. Minobe;Y. Sasaki
中科院分区：
文献类型：
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作者：
H. Na;kwang-yul kim;S. Minobe;Y. Sasaki
通过分析45年（1964-2008年）的观测和再分析资料，研究了西北太平洋（NP）海域年际到年代际的三维海洋热力结构和变率，并讨论了其与海洋和大气变率的关系。结果表明，黑潮延伸区（KE）和副北极锋区（SAFZ）的纬向移动与KE和SAFZ区的总体冷暖变化有关（KE-SAFZ模式）。看来，然而，KE强度的变化诱导不同的迹象，热异常的南部和北部的KE，而不是扩展到SAFZ（KE模式），可能有助于KE和SAFZ之间的非相干变化。因此，KE和SAFZ在KE-SAFZ模式的上下文中彼此依赖，而KE在KE模式方面独立于SAFZ。这种复杂的关系与不同的联系，大气变率; KE-SAFZ模式表现出相对较快的响应，大尺度风应力旋度强迫在NP，而KE模式是有关的延迟响应，大气强迫通过射流捕获斜压Rossby波传播。这两种模式的潜在机制的进一步了解将有助于理解海洋-大气反馈以及潜在的可预测性在西部边界流区在NP。
Three-dimensional oceanic thermal structures and variability in the western North Pacific (NP) are examined on the interannual to decadal time scales and their relationship to oceanic and atmospheric variability is discussed by analyzing observation and reanalysis data for 45 years (1964–2008), which is much longer than the satellite-altimetry period. It is shown that the meridional shift of the Kuroshio Extension (KE) and subarctic frontal zone (SAFZ) is associated with the overall cooling/warming over the KE and SAFZ region (KE–SAFZ mode). It appears, however, that changes in KE strength induce different signs of thermal anomalies to the south and north of the KE, not extended to the SAFZ (KE mode), possibly contributing to noncoherent variability between the KE and SAFZ. Thus, the KE and SAFZ are dependent on each other in the context of the KE–SAFZ mode, while the KE is independent of the SAFZ in terms of the KE mode. This intricate relationship is associated with different linkages to atmospheric variability; the KE–SAFZ mode exhibits a relatively fast response to the large-scale wind stress curl forcing in the NP, whereas the KE mode is related to a delayed response to the atmospheric forcing via jet-trapped baroclinic Rossby wave propagation. It is suggested that further knowledge of the underlying mechanisms of the two modes would contribute to understanding ocean–atmosphere feedback as well as potential predictability over the western boundary current region in the NP.