DOI: 10.1007/s00382-016-3391-1
Scopus记录号: 2-s2.0-84991079616
论文题名: North Pacific decadal variability: insights from a biennial ENSO environment
作者: Achuthavarier D. ; Schubert S.D. ; Vikhliaev Y.V.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期: 4 起始页码: 1379
结束页码: 1397
语种: 英语
英文关键词: Aleutian low
; Climate models
; Decadal variability
; El Niño-Southern Oscillation
; Pacific decadal oscillation
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 Niño-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°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. © 2016, Springer-Verlag Berlin Heidelberg. 资助项目: GSFC, Goddard Space Flight Center
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53132
Appears in Collections: 过去全球变化的重建
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作者单位: Goddard Earth Sciences Technology and Research, Universities Space Research Association, Columbia, MD, United States; Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Code 610.1, Bldg. 33, Greenbelt, MD, United States
Recommended Citation:
Achuthavarier D.,Schubert S.D.,Vikhliaev Y.V.. North Pacific decadal variability: insights from a biennial ENSO environment[J]. Climate Dynamics,2017-01-01,49(4)