Institutional Repository of Key Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences
Role of subsurface entrainment temperature (Te) in the onset of El Nio events, as represented in an intermediate coupled model | |
Zhang, Rong-Hua1; Gao, Chuan1,2 | |
2016-03-01 | |
发表期刊 | CLIMATE DYNAMICS |
卷号 | 46期号:5-6页码:1417-1435 |
文章类型 | Article |
摘要 | An improved intermediate coupled model (ICM) is described for use in ENSO-related modeling in the tropical Pacific, with ten baroclinic modes included in the vertical and horizonatally varying stratification taken into account. One crucial component of the model is the way in which the subsurface entrainment temperature in the surface mixed layer (T-e) is explicitly used to determine the sea surface temperature (SST) variability. An optimized procedure is developed to depict T-e using inverse modeling from an SST anomaly equation and its empirical relationship with the sea surface pressure variability. The coupled system realistically produces interannual variability associated with ENSO cycles, with a dominant 4-year oscillation. The onset and development of El Nio events from this ICM are examined in view of the well-known delayed oscillator paradigm; an example is given for the evolution of La Nia conditions in model year 2 to El Nio conditions in year 4. Right after a La Nia event (e.g., in year 2), there is a clear signature of reflections at the western boundary in early year 2, with related equatorial signals propagating eastward along the equator into the eastern basin in middle year 2. However, these reflected signals on the equator do not directly lead to an onset of an El Nio event at that time. Instead, approximately 1-year delay, a major El Nio event is seen to develop in the following year (late year 3), at a time when there is no reflected signal explicitly from the western boundary, indicating that the origin of the El Nio event cannot be directly ascribed to the reflection processes. Instead, Kelvin waves in the ocean that actually triggers the El Nio event in early year 3 are generated by interior wind anomalies near the date line that are associated with the first appearance of warm SST anomalies off the equator. Persisted T-e anomalies off the equator in the western tropical Pacific initiate the warm SST anomaly near the date line along the North Equatorial Countercurrent region, which induces wind anomalies and an ocean-atmosphere coupling, leading to the El Nio event in year 4. The relevance of these ICM-based results to other onset mechanisms of El Nio and observations is also discussed. |
DOI | 10.1007/s00382-015-2655-5 |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000371069900005 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.qdio.ac.cn/handle/337002/112477 |
专题 | 海洋环流与波动重点实验室 |
作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
第一作者单位 | 海洋环流与波动重点实验室 |
推荐引用方式 GB/T 7714 | Zhang, Rong-Hua,Gao, Chuan. Role of subsurface entrainment temperature (Te) in the onset of El Nio events, as represented in an intermediate coupled model[J]. CLIMATE DYNAMICS,2016,46(5-6):1417-1435. |
APA | Zhang, Rong-Hua,&Gao, Chuan.(2016).Role of subsurface entrainment temperature (Te) in the onset of El Nio events, as represented in an intermediate coupled model.CLIMATE DYNAMICS,46(5-6),1417-1435. |
MLA | Zhang, Rong-Hua,et al."Role of subsurface entrainment temperature (Te) in the onset of El Nio events, as represented in an intermediate coupled model".CLIMATE DYNAMICS 46.5-6(2016):1417-1435. |
条目包含的文件 | ||||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
Role of subsurface e(3836KB) | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
查看访问统计 |
导出为Endnote文件 |
谷歌学术 |
谷歌学术中相似的文章 |
[Zhang, Rong-Hua]的文章 |
[Gao, Chuan]的文章 |
百度学术 |
百度学术中相似的文章 |
[Zhang, Rong-Hua]的文章 |
[Gao, Chuan]的文章 |
必应学术 |
必应学术中相似的文章 |
[Zhang, Rong-Hua]的文章 |
[Gao, Chuan]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论