不同IPO位相下两类El Niño事件次表层非线性动力加热项的贡献差异

doi:10.11978/2025113

Abstract

Abstract:

In the early 21st century, the Interdecadal Pacific Oscillation (IPO) shifted from a positive to a negative phase, which coincided with a change in the dominant type of El Niño events from the eastern Pacific (EP) El Niño to the central Pacific (CP) El Niño, suggesting a statistical association between the IPO phase transitions and the spatial types of El Niño events. To elucidate this phenomenon, this study investigates the different contributions of subsurface nonlinear dynamical heating (NDH) to distinct El Niño types under different IPO phases, utilizing datasets from HadISST, ORAS5, and GODAS, combined with an ocean heat budget analysis. Results reveal that during a positive IPO phase, subsurface NDH intensifies significantly in the eastern Pacific, promoting the development of EP-type El Niño. Conversely, during a negative IPO phase, weakened NDH in the Niño3 region reduces the ability to sustain warm anomalies in the eastern Pacific, while stable NDH in the Niño4 region increases the ratio of CP-type events (up to 80%). These findings highlight that spatiotemporal differences in eastern Pacific subsurface NDH constitute a key dynamic factor responsible for the differences in spatial types of El Niño events. Additionally, both thermocline feedback (TH) and zonal advective feedback (ZA) play certain roles in CP El Niño events, with zonally distinct contributions.

Key words: EP/CP El Niño, IPO, heat budget analysis, nonlinear dynamical heating term, subsurface layer

CLC Number:

P732

LI Yuzhen, MENG Xiangfeng. Differences in subsurface nonlinear dynamical heating contributions between two types of El Niño under different IPO phases[J].Journal of Tropical Oceanography, 2026, 45(3): 83-94.

Figures/Tables 9

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Differences in subsurface nonlinear dynamical heating contributions between two types of El Niño under different IPO phases

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序号	年份	方法			结果
序号	年份	N_WP/N_CT	EMI	Niño3/4	结果
1	1982/1983	EP	EP	EP	EP
2	1986/1987	EP	EP	EP	EP
3	1991/1992	EP	CP	EP	EP
4	1994/1995	CP	CP	CP	CP
5	1997/1998	EP	EP	EP	EP
6	2002/2003	CP	CP	CP	CP
7	2004/2005	CP	CP	CP	CP
8	2006/2007	CP	EP	CP	CP
9	2009/2010	CP	CP	CP	CP
10	2015/2016	EP	EP	EP	EP

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