DOI: 10.1007/s00382-012-1403-3
Scopus记录号: 2-s2.0-84874948365
论文题名: Inverse relationship between the equatorial eastern Pacific annual-cycle and ENSO amplitudes in a coupled general circulation model
作者: An S.-I. ; Choi J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 40, 期: 2017-03-04 起始页码: 663
结束页码: 675
语种: 英语
英文关键词: Annual cycle
; Decadal modulation
; ENSO
; Inverse relationship between ENSO and annual cycle
英文摘要: We propose a dynamical interpretation of the inverse relationship between the tropical eastern Pacific annual-cycle (AC) amplitude and the El Niño-Southern Oscillation (ENSO) amplitude, based on a pre-industrial simulation of Geophysical Fluid Dynamics Laboratory Couple climate model 2. 0 with a fixed concentration of greenhouse gases spanning approximately 500 years. The slowly varying background conditions over more than a decade alternately provided favorable conditions for two opposite regimes, namely the 'strong AC-weak ENSO regime' and the 'weak AC-strong ENSO regime'. For the weak AC-strong ENSO regime, the tropical eastern Pacific shows meridional-asymmetric surface warming with an emphasis on the southern part, leading to weakening of both the zonal trade wind and the cross equatorial southerly wind, as well as deepening of both the thermocline and mixed layer. The deeper mixed layer, weaker southerly wind, and reduced zonal gradient of the mean sea surface temperature due to tropical eastern Pacific warming all acts to reduce the AC. Conversely, the ENSO was intensified by the deeper mixed layer and deeper thermocline depth (thermocline feedback), but suppressed by the deeper thermocline depth (Ekman feedback) and the reduced zonal temperature gradient. We also computed the coupling strengths of the ENSO and AC, defined as the linear regression coefficients of the zonal and meridional wind stresses against the eastern Pacific SST, respectively. The coupling strengths of both the AC and ENSO are larger when they are intensified, and vice versa. All processes for the weak AC-strong ENSO regime operate in the opposite manner for the strong AC-weak ENSO regime. © 2012 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54941
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Atmospheric Sciences, Yonsei University, Seoul, 120-749, South Korea
Recommended Citation:
An S.-I.,Choi J.. Inverse relationship between the equatorial eastern Pacific annual-cycle and ENSO amplitudes in a coupled general circulation model[J]. Climate Dynamics,2013-01-01,40(2017-03-04)