A nonlinear full-field conceptual model for ENSO diversity

IF 4.8 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Xianghui Fang, Henk Dijkstra, Claudia Wieners, Francesco Guardamagna
{"title":"A nonlinear full-field conceptual model for ENSO diversity","authors":"Xianghui Fang, Henk Dijkstra, Claudia Wieners, Francesco Guardamagna","doi":"10.1175/jcli-d-23-0382.1","DOIUrl":null,"url":null,"abstract":"Abstract As the strongest year-to-year fluctuation of the global climate system, El Niño-Southern Oscillation (ENSO) exhibits spatial-temporal diversity, which challenges the classical ENSO theories that mainly focus on the canonical eastern Pacific (EP) type. Besides, the complicated interplay between the interannual anomaly fields and the decadally varying mean state is another difficulty in current ENSO theory. To better account for these issues, the nonlinear two-region recharge paradigm model is extended to a three-region full-field conceptual model to capture the physics in the western Pacific (WP), central Pacific (CP) and EP regions. The results show that the extended conceptual model displays a rich dynamical behavior as parameters setting the efficiencies of upwelling and zonal advection are varied. The model can not only generate El Niño bursting behavior, but also simulate the statistical asymmetries between the two types of El Niño and the warm and cold phases of ENSO. Finally, since both the anomaly fields and mean states are simulated by the model, it provides a simple tool to investigate their interactions. The strengthening of the upwelling efficiency, which can be seen as an analogy to a cooling thermocline associated with the oceanic tunnel to the mid-latitudes, will increase the zonal gradient of the mean state temperature between the WP and EP, i.e., resembling a negative Pacific Decadal Oscillation (PDO) pattern along the equatorial Pacific. The influence of the zonal advection efficiency is quite the opposite, i.e., its strengthening will reduce the zonal gradient of the mean state temperature along the equatorial Pacific.","PeriodicalId":15472,"journal":{"name":"Journal of Climate","volume":"34 1","pages":""},"PeriodicalIF":4.8000,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Climate","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1175/jcli-d-23-0382.1","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"METEOROLOGY & ATMOSPHERIC SCIENCES","Score":null,"Total":0}
引用次数: 0

Abstract

Abstract As the strongest year-to-year fluctuation of the global climate system, El Niño-Southern Oscillation (ENSO) exhibits spatial-temporal diversity, which challenges the classical ENSO theories that mainly focus on the canonical eastern Pacific (EP) type. Besides, the complicated interplay between the interannual anomaly fields and the decadally varying mean state is another difficulty in current ENSO theory. To better account for these issues, the nonlinear two-region recharge paradigm model is extended to a three-region full-field conceptual model to capture the physics in the western Pacific (WP), central Pacific (CP) and EP regions. The results show that the extended conceptual model displays a rich dynamical behavior as parameters setting the efficiencies of upwelling and zonal advection are varied. The model can not only generate El Niño bursting behavior, but also simulate the statistical asymmetries between the two types of El Niño and the warm and cold phases of ENSO. Finally, since both the anomaly fields and mean states are simulated by the model, it provides a simple tool to investigate their interactions. The strengthening of the upwelling efficiency, which can be seen as an analogy to a cooling thermocline associated with the oceanic tunnel to the mid-latitudes, will increase the zonal gradient of the mean state temperature between the WP and EP, i.e., resembling a negative Pacific Decadal Oscillation (PDO) pattern along the equatorial Pacific. The influence of the zonal advection efficiency is quite the opposite, i.e., its strengthening will reduce the zonal gradient of the mean state temperature along the equatorial Pacific.
厄尔尼诺/南方涛动多样性的非线性全场概念模型
摘要 作为全球气候系统中最强的逐年波动,厄尔尼诺-南方涛动(ENSO)在时空上表现出多样性,这对以典型的东太平洋(EP)类型为主的经典ENSO理论提出了挑战。此外,年际异常场与十年变化的平均状态之间复杂的相互作用是当前 ENSO 理论的另一个难点。为了更好地解释这些问题,将非线性的两区补给范式模式扩展为三区全场概念模型,以捕捉西太平洋(WP)、中太平洋(CP)和东太平洋(EP)区域的物理现象。结果表明,当设定上升流和带状平流效率的参数发生变化时,扩展的概念模型显示出丰富的动力学行为。该模式不仅能产生厄尔尼诺爆发行为,还能模拟两种厄尔尼诺现象之间的统计不对称以及厄尔尼诺/南方涛动的冷暖阶段。最后,由于异常场和平均状态都是由模型模拟的,因此它为研究它们之间的相互作用提供了一个简单的工具。上升流效率的加强(可视为与通往中纬度的海洋隧道相关的冷却热层)将增加 WP 和 EP 之间平均态温度的带状梯度,即类似于沿赤道太平洋的负太平洋十年涛动(PDO)模式。而区带平流效率的影响则恰恰相反,即区带平流效率的增强将减小赤道太平洋沿岸平均温度的区带梯度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Journal of Climate
Journal of Climate 地学-气象与大气科学
CiteScore
9.30
自引率
14.30%
发文量
490
审稿时长
7.5 months
期刊介绍: The Journal of Climate (JCLI) (ISSN: 0894-8755; eISSN: 1520-0442) publishes research that advances basic understanding of the dynamics and physics of the climate system on large spatial scales, including variability of the atmosphere, oceans, land surface, and cryosphere; past, present, and projected future changes in the climate system; and climate simulation and prediction.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信