气候变化领域集成服务门户(CCPortal): Relationship between NPO and multi-year El Niño events in a 2200 years simulation of CESM1

CCPortal

DOI	10.1007/s00382-023-07079-w
	Relationship between NPO and multi-year El Niño events in a 2200 years simulation of CESM1
	Shi, Liang; Hu, Shujuan; Ding, Ruiqiang
发表日期	2024
ISSN	0930-7575
EISSN	1432-0894
英文摘要	The boreal winter North Pacific Oscillation (NPO) has been proven to be a crucial trigger in the occurrence of multi-year El Nino events. However, the limited number of multi-year El Nino events in observational data (only five times since 1950) introduces certain limitations and uncertainties to the findings. Therefore, this study reexamines the relationship between the NPO and multi-year El Nino events using a 2200-year simulation of the Community Earth System Model, version 1. Our results demonstrate that the NPO can influence multi-year El Nino events through two pathways: (1) The thermodynamic process: the boreal winter NPO event, along with its forced North Pacific Meridional mode (NPMM), can trigger central Pacific (CP) El Nino event in the following winter. Meanwhile, this CP El Nino event then induces another NPO-like SLP variability over the North Pacific, which subsequently forces the generations of the NPMM again, providing favorable conditions for another El Nino event, eventually leading to a multi-year El Nino event. (2) The dynamic process: The consecutive NPO events and their related anomalous southwesterly wind stress over the subtropical North Pacific region can modify the wind stress curl of the central Pacific. These modified curls persist and further strengthen the equatorward anomalous Ekman transports from the northern off-equatorial and suppress the off-equatorward geostrophic transports, ultimately favoring the ongoing recharge process and leading to the prolonged or intensified El Nino events. Additionally, our findings suggest that the anomalies Ekman transport at 5 degrees N can be a good ENSO precursor for 2-3 seasons in advance. These findings may provide valuable insights for predicting the evolution of ENSO diversity.
英文关键词	North Pacific Oscillation (NPO); North Pacific Meridional (NPMM); Multi-year El Nino; ENSO Predictability
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:001150686300003
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/303156
作者单位	Beijing Normal University; Lanzhou University; Chinese Academy of Sciences; Institute of Atmospheric Physics, CAS
推荐引用方式 GB/T 7714	Shi, Liang,Hu, Shujuan,Ding, Ruiqiang. Relationship between NPO and multi-year El Niño events in a 2200 years simulation of CESM1[J],2024.
APA	Shi, Liang,Hu, Shujuan,&Ding, Ruiqiang.(2024).Relationship between NPO and multi-year El Niño events in a 2200 years simulation of CESM1.CLIMATE DYNAMICS.
MLA	Shi, Liang,et al."Relationship between NPO and multi-year El Niño events in a 2200 years simulation of CESM1".CLIMATE DYNAMICS (2024).