Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-016-3391-1 |
North Pacific decadal variability: insights from a biennial ENSO environment | |
Achuthavarier, Deepthi1,2; Schubert, Siegfried D.2; Vikhliaev, Yury V.1 | |
2017-08-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 49期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | This study examines the mechanisms of the Pacific decadal oscillation (PDO) in the NASA GEOS-5 general circulation model (GCM). Similar to several other state-of-the-art GCMs, the El Nino-Southern Oscillation (ENSO) simulated by the GEOS-5 has a strong biennial periodicity. Since this is a model bias that precludes a strong role of ENSO, it provides a unique environment to assess the other leading mechanisms of North Pacific decadal variability. Despite the biennial ENSO periodicity, the model simulates a realistic PDO pattern in the North Pacific that is resolved as the first empirical orthogonal function (EOF) of winter mean sea surface temperature (SST). The spectrum of the PDO indicates no preferred periodicity. The SST anomalies associated with the PDO, particularly its basin wide structure, are primarily forced by the Aleutian low through Ekman transport. The slow geostrophic transport in association with the meridional adjustment of the subtropical gyre is limited to a narrow region in the Kuroshio-Oyashio extension, north of 40 degrees N. The atmosphere's response to the PDO, while weak, projects onto the North Pacific Oscillation (NPO), a meridional dipole in sea level pressure. Both the lack of preferred periodicity and the weak atmospheric response indicate an air-sea coupled oscillation is an unlikely mechanism in this model. In agreement with recent studies, the NPO is correlated with the North Pacific Gyre Oscillation, which is another leading EOF of North Pacific SST variability. The results emphasize the role of atmospheric variability in the North Pacific SST modes, thereby bringing into question the potential for their predictability. |
英文关键词 | Decadal variability Pacific decadal oscillation Climate models El Nino-Southern Oscillation Aleutian low |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000407247200014 |
WOS关键词 | INTERDECADAL CLIMATE VARIABILITY ; SURFACE TEMPERATURE ANOMALIES ; KUROSHIO-OYASHIO EXTENSION ; GEOPOTENTIAL HEIGHT FIELD ; HEMISPHERE WINTER ; SST ANOMALIES ; OCEAN MODEL ; OSCILLATION ; TELECONNECTIONS ; CIRCULATION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35255 |
专题 | 气候变化 |
作者单位 | 1.Univ Space Res Assoc, Goddard Earth Sci Technol & Res, Columbia, MD 21046 USA; 2.NASA, Global Modeling & Assimilat Off, Goddard Space Flight Ctr, Code 610-1,Bldg 33, Greenbelt, MD 20771 USA |
推荐引用方式 GB/T 7714 | Achuthavarier, Deepthi,Schubert, Siegfried D.,Vikhliaev, Yury V.. North Pacific decadal variability: insights from a biennial ENSO environment[J]. CLIMATE DYNAMICS,2017,49(4). |
APA | Achuthavarier, Deepthi,Schubert, Siegfried D.,&Vikhliaev, Yury V..(2017).North Pacific decadal variability: insights from a biennial ENSO environment.CLIMATE DYNAMICS,49(4). |
MLA | Achuthavarier, Deepthi,et al."North Pacific decadal variability: insights from a biennial ENSO environment".CLIMATE DYNAMICS 49.4(2017). |
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