Subduction of water masses serves as a critical linkage between the surface and subsurface ocean, playing a crucial role in redistributing heat, carbon, and nutrients in the ocean. This process significantly influences global climate and marine ecosystem dynamics. Analyzing five ocean reanalysis data sets, we reveal a distinctive see-saw pattern in anomalous subduction rates between western and eastern Subtropical Mode Water (STMW) formation areas. This pattern is predominantly driven by variations in latent heat flux, which modulates the late-winter mixed layer depth. We demonstrate that late-winter Aleutian Low (AL) activity induces these anti-phase variations through its impact on latent heat flux. Notably, the Pacific Decadal Oscillation (PDO) significantly influences this subduction see-saw pattern. During PDO warm phases, AL southward shift intensifies the anti-correlated variations. Conversely, during cold phases, AL northward shift weakens its influence on ESTMW area, resulting in a less stable anti-phase relationship.

中文翻译：

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阿留申低压诱发的北太平洋西部和东部副热带模态水形成区俯冲速率的跷跷板


水团俯冲是表层海洋和地下海洋之间的关键联系，在海洋中重新分配热量、碳和营养物质方面发挥着至关重要的作用。这一过程对全球气候和海洋生态系统动态产生重大影响。通过分析五个海洋再分析数据集，我们揭示了东西部副热带模态水 （STMW） 形成区之间异常俯冲速率的独特跷跷板模式。这种模式主要由潜热通量的变化驱动，潜热通量调节了冬末混合层深度。我们证明，冬末阿留申低压 （AL） 活动通过对潜热通量的影响诱导这些反相变化。值得注意的是，太平洋年代际振荡 （PDO） 显着影响了这种俯冲跷跷板模式。在 PDO 温暖阶段，AL 南移加剧了反相关变化。相反，在冷相期间，AL 北移削弱了其对 ESTMW 区的影响，导致反相关系不太稳定。