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

菲律宾近海低纬度西边界流的季节内到年代际变化和涡旋的作用

• 批准号: 1029704
• 负责人: Tangdong Qu
• 金额: $ 39.83万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-10-01 至 2014-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1029704&HistoricalAwards=false
• 关键词: Intra; seasonal; decadal; variability; role

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.

低纬西太平洋边界流已被证明在全球气候中起着重要作用，S。它对西太平洋暖池和赤道温跃层的通风起着调节作用，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。这项研究将所有可获得的观测结果与地球模拟器(OFES)和海洋环流和气候估计联合会(ECCO)的结果结合在一起。OFES具有较高的(0.1度)分辨率和较长的(1950-2003)积分周期，其模拟的低强度大气边界条件已被证明是现有模型中最好的之一。ECCO的分辨率相对较低(1°×1/3°)，积分周期较短(1982年至今)，但其模拟的被动和伴随示踪剂提供了追踪低层WBC的独特机会。该项目的目标是(1)完成对低层低温带的三维结构和季内-年代际变化的描述，(2)研究涡旋的能量来源及其对低层温带的影响，以及(3)确定低层温带的起源、路径和命运，特别是参考菲律宾附近的中间深度。这些结果将有助于评估亚澳季风系统的可预报性，改进ENSO预报，理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，并将通过在来自不同国家的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。