On the role of oceanic entrainment temperature (Te) in decadal changes of El Niño/Southern Oscillation

IOCAS-IR > 海洋环流与波动重点实验室

	On the role of oceanic entrainment temperature (Te) in decadal changes of El Niño/Southern Oscillation
	Zhu Jiang; Zhou J.; Zhang Ronghua; Sun Z.
	2011
发表期刊	ANNALES GEOPHYSICAE
卷号	29 期号:3 页码:529-540
摘要	The role of decadal changes in ocean thermal structure in modulating El Nino/Southern Oscillation (ENSO) properties was examined using a hybrid coupled model (HCM), consisting of a statistical atmospheric model and an oceanic general circulation model (OGCM) with an explicitly embedded empirical parameterization for the temperature of subsurface water entrained into the mixed layer (T-e), which was constructed via an EOF analysis of model-based historical data. Using the empirical T-e models constructed from two subperiods, 1963-1979 (T-e(63-79)) and 1980-1996 (T-e(80-96)), the coupled system exhibits striking different properties of interannual variability, including oscillation periods and the propagation characteristic of sea surface temperature anomalies (SSTAs) along the equator. In the T-e(63-79e) run, the model features a 2-3 yr oscillation and a westward propagation of SSTAs along the equator, while in the Te80-96 run, it is characterized by a 4-5 yr oscillation and an eastward propagation. Furthermore, a Lag Covariance Analysis (LCOA) was utilized to illustrate the leading physical processes responsible for decadal change in SST. It is shown that the change in the structure of T-e acts to modulate the relative strength of the zonal advective and thermocline feedbacks in the coupled system, leading to changes in ENSO properties. Two additional sensitive experiments were conducted to further illustrate the respective roles of the changes in ocean mean states and in T-e in modulating ENSO behaviors. These decadal changes in the simulated ENSO properties are consistent with the observed shift occurred in the late 1970s and a previous simulation performed with an intermediate coupled model (ICM) described in Zhang and Busalacchi (2005), indicating a dominant role T-e plays in decadal ENSO changes.
关键词	Meteorology And Atmospheric Dynamics Climatology
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/18153
专题	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Zhu Jiang,Zhou J.,Zhang Ronghua,et al. On the role of oceanic entrainment temperature (Te) in decadal changes of El Niño/Southern Oscillation[J]. ANNALES GEOPHYSICAE,2011,29(3):529-540.
APA	Zhu Jiang,Zhou J.,Zhang Ronghua,&Sun Z..(2011).On the role of oceanic entrainment temperature (Te) in decadal changes of El Niño/Southern Oscillation.ANNALES GEOPHYSICAE,29(3),529-540.
MLA	Zhu Jiang,et al."On the role of oceanic entrainment temperature (Te) in decadal changes of El Niño/Southern Oscillation".ANNALES GEOPHYSICAE 29.3(2011):529-540.

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