Interdecadal Relationship between the Mean State and El Niño Types

University of Taipei > 人文藝術學院 > 歷史與地理學系 > 期刊論文 > Item 987654321/12282

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题名:	Interdecadal Relationship between the Mean State and El Niño Types
作者:	Pei-Hsuan Chung 鍾珮瑄 Tim Li
贡献者:	臺北市立教育大學歷史與地理學系
关键词:	El Nino;Air-sea interaction;Climate models;Climate variability;Interdecadal variability;Tropical variability
日期:	2013-01
上传时间:	2014-06-10 15:25:35 (UTC+8)
摘要:	The interdecadal change of the mean state and two types of El Niño was investigated based on the analysis of observational data from 1980 to 2010. It was found that easterly trades and sea surface temperature (SST) gradients across the equatorial Pacific undergo a regime change in 1998/99, with enhanced trades and a significant cooling (warming) over tropical eastern (western) Pacific in the later period. Accompanying this mean state change is more frequent occurrence of central Pacific (CP) El Niño during 1999–2010. The diagnosis of air–sea feedback strength showed that atmospheric precipitation and wind responses to CP El Niño are greater than those to the eastern Pacific (EP) El Niño for given a unit SST anomaly (SSTA) forcing. The oceanic response to the same wind forcing, however, is greater in the EP El Niño than in the CP El Niño. A mixed layer heat budget analysis reveals that zonal advection (thermocline change induced vertical advection) primarily contributes to the CP (EP) El Niño growth. The role of the mean SST zonal gradient in El Niño selection was investigated through idealized numerical experiments. With the increase of the background zonal SST gradient, the anomalous wind and convection response to a specified EP or CP SSTA shift to the west. Such a difference results in a bifurcation of maximum SSTA tendency, as shown from a simple ocean model. The numerical results support the notion that a shift to the La Niño–like interdecadal mean state is responsible for more frequent occurrence of CP-type El Niño.
關聯:	Journal of climate，v.26n.2，p.361-379
显示于类别:	[歷史與地理學系] 期刊論文

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