气候变化领域集成服务门户(CCPortal): The role of interannual ENSO events in decadal timescale transitions of the Interdecadal Pacific Oscillation

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DOI	10.1007/s00382-021-05784-y
	The role of interannual ENSO events in decadal timescale transitions of the Interdecadal Pacific Oscillation
	Meehl G.A.; Teng H.; Capotondi A.; Hu A.
发表日期	2021
ISSN	0930-7575
英文摘要	The build-up of decadal timescale upper ocean heat content in the off-equatorial western tropical Pacific can provide necessary conditions for interannual El Niño/Southern Oscillation (ENSO) events to contribute to decadal timescale transitions of tropical Pacific SSTs to the opposite phase of the Interdecadal Pacific Oscillation (IPO). This can be viewed as a corollary to subseasonal westerly wind burst events contributing to El Niño interannual timescale transitions. A long pre-industrial control run with CESM1 is analyzed to show that there is a greater chance of ENSO activity to contribute to an IPO transition when off-equatorial western Pacific Ocean heat content reaches either a maximum (for El Niño to contribute to a transition to positive IPO) or minimum (for La Niña to contribute to a transition to negative IPO) as seen in observations. If above a necessary ocean heat content threshold, the convergence associated with westerly anomaly near-equatorial surface winds associated with El Niño activity can draw that heat content equatorward to sustain anomalously warm western and central Pacific SSTs. These are associated with positive precipitation and convective heating anomalies, a Gill-type response and wind stress curl anomalies that continue to feed warm water into the near-equatorial western Pacific. These conditions then sustain the decadal-timescale transition to positive IPO (with the opposite sign for transition to negative IPO). Associated central equatorial Pacific convective heating anomalies produce SLP and wind stress anomalies in the North and South Pacific that can excite westward-propagating off-equatorial oceanic Rossby waves to contribute to the western Pacific thermocline depth and consequent heat content anomalies. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Decadal variability; El Nino; ENSO; Interdecadal Pacific Oscillation; Ocean heat content
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183463
作者单位	National Center for Atmospheric Research, Boulder, CO, United States; Pacific Northwest National Laboratory (PNNL), Richland, WA, United States; University of Colorado/CIRES and NOAA/Physical Sciences Laboratory, University of Colorado and NOAA, Boulder, CO, United States
推荐引用方式 GB/T 7714	Meehl G.A.,Teng H.,Capotondi A.,et al. The role of interannual ENSO events in decadal timescale transitions of the Interdecadal Pacific Oscillation[J],2021.
APA	Meehl G.A.,Teng H.,Capotondi A.,&Hu A..(2021).The role of interannual ENSO events in decadal timescale transitions of the Interdecadal Pacific Oscillation.Climate Dynamics.
MLA	Meehl G.A.,et al."The role of interannual ENSO events in decadal timescale transitions of the Interdecadal Pacific Oscillation".Climate Dynamics (2021).