Intra-seasonal to decadal variability and role of eddies in the low-latitude western boundary current off the Philippines

太平洋低纬度西边界流（LLWBC）已被证明在世界上发挥着重要作用。年代的气候。它在西太平洋暖池的调节和赤道温跃层的通风中起着重要的作用，对厄尔尼诺/南方涛动和太平洋年代际涛动（PDO）等现象具有重要意义。本研究将所有现有观测资料与OGCM为地球模拟器（OFES）和海洋环流与气候估算联盟（ECCO）提供的结果结合起来。OFES具有更高的分辨率（0.1°）和更长的积分周期（1950-2003），其模拟的LLWBC已被证明是模型中最好的之一。ECCO具有相对粗糙的分辨率（1deg×1/3deg）和较短的整合周期（1982年至今），但其模拟的被动和伴随示踪剂为追踪LLWBC提供了独特的机会。该项目的目标是(1)完成对LLWBC的三维结构和季内年代际变化的描述，(2)检查涡流的能量来源及其对LLWBC的影响，以及(3)确定LLWBC的起源，途径和命运，特别参考菲律宾附近的中间深度。这些结果将有助于评估亚洲-澳大利亚季风系统的可预测性，改进ENSO预测，了解太平洋年代际变化的机制，以及这些现象的各种影响。该项目将支持一名博士后研究人员，并将通过在不同国家不同机构的不同气候研究小组之间建立合作，加强研究和教育的基础设施。

The low-latitude western boundary current (LLWBC) of the Pacific has been shown to play an important role in the world?s climate. It plays a role in modulating the western Pacific warm pool and ventilating the equatorial thermocline, which are important for phenomena like El Nino/Southern Oscillation and Pacific Decadal Oscillation (PDO). This study combines all available observations with results from the OGCM for the Earth Simulator (OFES) and the Consortium for Estimating the Circulation and Climate of the Ocean (ECCO). The OFES has a higher (0.1deg) resolution and longer (1950-2003) period of integration, and its simulated LLWBC has proven to be one of the best available in a model. The ECCO has a relatively coarse (1deg×1/3deg) resolution and shorter (1982-present) period of integration, but its simulated passive and adjoint tracer provides a unique opportunity to trace the LLWBC. The project goals are to (1) complete the description of 3-dimensional structure and intraseasonal-decadal variability of the LLWBC, (2) examine the energy source of eddies and their impacts on the LLWBC, and (3) identify the origin, pathway, and fate of the LLWBC, with special reference to the intermediate depth off the Philippines. The results will contribute to assessing predictability of the Asia-Australia monsoon system, improving ENSO predictions, and understanding mechanisms of Pacific decadal variability, as well as various impacts of these phenomena. The project will support a postdoctoral researcher and will enhance infrastructure for research and education by establishing collaborations between different climate research groups in different institutions from different nations.