权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

El Nino-Southern Oscillation (ENSO) Interactions with Tropical Atlantic and Indian Oceans

厄尔尼诺-南方涛动 (ENSO) 与热带大西洋和印度洋的相互作用

基本信息

批准号：
2006553
负责人：
Tim Li
金额：
$ 59.93万
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：
2020
资助国家：
美国
起止时间：
2020-07-01 至 2023-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2006553&HistoricalAwards=false
关键词：
El Nino Southern Oscillation ENSO

项目摘要

The El Niño-Southern Oscillation (ENSO) is the dominant interannual variability in the Earth’s climate. Current understanding of the interactions between ENSO and tropical Atlantic and Indian Ocean is limited. However, these interactions are seemingly crucial for accurate prediction of ENSO structure and evolution and its global impact. Current operational models have difficulty accurately predicting ENSO and its interactions with climate modes in other ocean basins. Through observational analyses and numerical modeling tasks, results from this award may reveal key physical processes behind these interactions and advance our current knowledge of ENSO dynamics, pan-tropical climate interactions, and general large-scale atmosphere-ocean interactions. This in turn may provide additional metrics to assess and improve global model representations of ENSO and its influence on weather events.The award has three research thrusts. The first thrust investigates the relative roles of ENSO-induced extratropical and tropical forcing of sea surface temperature anomaly (SSTA) in the tropical North Atlantic (TNA) and how the TNA SSTA may feedback to ENSO through induced Rossby and Kelvin wave responses. Observational analyses and idealized model experiments will be performed. The second thrust examines the interaction between Atlantic Niño and ENSO. A composite analysis will be conducted to elucidate the formation mechanisms of Atlantic Niño under preceding El Niño and La Niña conditions. Coupled and uncoupled model experiments will be carried out to investigate how ENSO influences Atlantic Niño and how Atlantic Niño impacts subsequent ENSO evolution and to what extent model bias in sea surface temperature affects the remote Atlantic forcing. The third thrust investigates how ENSO influences the Indian Ocean dipole (IOD) and to what extent Indian Ocean basin warming contributes to El Niño turnabout. Focus will be placed on the effect of equatorially symmetric and antisymmetric circulation responses to El Niño during its developing summer and linear and nonlinear wind responses to the boreal winter IDO rainfall pattern.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

厄尔Niño-Southern涛动（ENSO）是地球气候的主要年际变化。目前对ENSO与热带大西洋和印度洋之间相互作用的认识是有限的。然而，这些相互作用似乎是准确预测ENSO结构和演变及其全球影响的关键。目前的业务模式难以准确预测ENSO及其与其他海洋盆地气候模式的相互作用。通过观测分析和数值模拟任务，该奖项的结果可能揭示这些相互作用背后的关键物理过程，并推进我们目前对ENSO动力学、泛热带气候相互作用和一般大尺度大气-海洋相互作用的了解。这反过来又可以提供额外的度量来评估和改进ENSO的全球模式表征及其对天气事件的影响。该奖项有三个研究重点。第一个推力研究了ENSO诱导的热带北大西洋（TNA）海温异常（SSTA）的温带和热带强迫的相对作用，以及TNA海温异常如何通过诱导的rosby和Kelvin波响应反馈给ENSO。将进行观测分析和理想模型实验。第二篇文章探讨了大西洋Niño和ENSO之间的相互作用。通过综合分析，阐明El Niño和La Niña条件下大西洋Niño的形成机制。将进行耦合和非耦合模式试验，以调查ENSO如何影响大西洋Niño，大西洋如何影响随后的ENSO演变，以及海表温度模式偏差在多大程度上影响遥远的大西洋强迫。第三个推力研究ENSO如何影响印度洋偶极子（IOD），以及印度洋盆地变暖在多大程度上促进了厄尔尼诺Niño转变。重点将放在赤道对称和反对称环流对El Niño夏季发展过程的响应以及线性和非线性风对北方冬季IDO降雨模式的响应上。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。