Collaborative Research: Westerly Wind Bursts: El Nino Southern Oscillation's (ENSO) Driver or Slave?

合作研究：西风爆发：厄尔尼诺南方涛动（ENSO）的推动者还是奴隶？

• 批准号: 0350266
• 负责人: Lisan Yu
• 金额: $ 5.92万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-03-01 至 2007-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0350266&HistoricalAwards=false
• 关键词: Collaborative; Research; Westerly; Wind; Bursts

Westerly wind burst (WWB) events are known to play an important role in El Nino Southern Oscillation's (ENSO) dynamics. The events are usually viewed as stochastic forcing that is independent of and external to the large scale ENSO dynamics. There are indications, however, that the occurrence of these events, and their characteristics, are influenced by the large scale SST structure, and hence by ENSO. This study will explore the dynamical consequences of the possibility that the timing and other characteristics of WWB events are partially regulated and controlled by the large scale SST distribution. That is, the study will examine the extreme possibility that these events occur only when the large scale SST structure is at a certain configuration. For example, when the warm pool is extended eastward beyond the dateline. In this scenario the WWB events will be treated as an inherent part of the deterministic ENSO dynamics rather than as external stochastic forcing. The study will first analyze observations in order to try and establish the characteristics of such a possible regulation of the timing or characteristics of WWB events by the large scale SST field. Next, the implications of such regulated switching of WWB events by the large scale ENSO dynamics will be studied using a hierarchy of models. The model hierarchy will include a hybrid coupled model (ocean general circulation model coupled to a statistical atmosphere), an intermediate coupled model, and a conceptual delayed oscillator model. Broader impacts of the research include possible improvement of ENSO's prediction skill, should the proposed research find a way to include a representation of WWB regulation by the large scale SST field in current ENSO prediction models. A graduate student (under Mark Cane) and a post-doc (under Eli Tziperman) will be educated, mentored and trained under this grant.

众所周知，西风爆发（WWB）事件在厄尔尼诺南方涛动（ENSO）动力学中发挥着重要作用。这些事件通常被视为独立于大尺度 ENSO 动力学且处于其外部的随机强迫。然而，有迹象表明，这些事件的发生及其特征受到大规模海温结构的影响，因此也受到 ENSO 的影响。本研究将探讨 WWB 事件的时间和其他特征部分受到大规模海表温度分布调节和控制的可能性的动态后果。也就是说，该研究将检验这些事件仅在大规模海表温度结构处于某种配置时发生的极端可能性。例如，当暖池向东延伸到日期变更线之外时。在这种情况下，WWB 事件将被视为确定性 ENSO 动力学的固有部分，而不是外部随机强迫。该研究将首先分析观测结果，以尝试并确定大规模海表温度场对 WWB 事件的时间或特征的可能调节的特征。接下来，将使用模型层次结构来研究大规模 ENSO 动力学对 WWB 事件的这种调节转换的影响。模型层次结构将包括混合耦合模型（与统计大气耦合的海洋大气环流模型）、中间耦合模型和概念延迟振荡器模型。如果拟议的研究找到一种方法，将大规模海温场对 WWB 的调节纳入当前 ENSO 预测模型中，那么该研究的更广泛影响包括可能提高 ENSO 的预测技能。一名研究生（马克·凯恩领导下）和一名博士后（伊莱·齐珀曼领导下）将在这笔赠款下接受教育、指导和培训。