首页|Salinity effect-induced ENSO amplitude modulation in association with the interdecadal Pacific Oscillation

Salinity effect-induced ENSO amplitude modulation in association with the interdecadal Pacific Oscillation

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A 110-year ensemble simulation of an ocean general circulation model(OGCM)was analyzed to identify the modulation of salinity interdecadal variability on El Nino-Southern Oscillation(ENSO)amplitude in the tropical Pacific during 1901-2010.The simulating results show that sea surface salinity(SSS)variation in the region exhibits notable and coherent interdecadal variability signal,which is closely associated with the Interdecadal Pacific Oscillation(IPO).As salinity increases or reduces,the SSS modulations on ENSO amplitude during its warm/cold events vary asymmetrically with positive/negative IPO phases.Physically,salinity interdecadal variability can enhance or reduce ENSO-related conditions in upper-ocean stratification,contributing noticeably to ENSO variability.Salinity anomalies associated with the mixed layer depth and barrier layer thickness can modulate ENSO amplitude during positive and negative IPO phases,resulting in the asymmetry of sea surface temperature(SST)anomaly in the tropical Pacific.During positive IPO phases,SSS interdecadal variability contributes positively to El Nino amplitude but negatively to La Nina amplitude by enhancing or reducing SSS interannual variability,and vice versa during negative IPO phases.Quantitatively,the results indicate that the modulation of the ENSO amplitude by the SSS interdecadal variability is-15％-28％during negative IPO phases and-30％-20％during positive IPO phases,respectively.Evidently,the SSS interdecadal variability associated with IPO and its modulation on ENSO amplitude in the tropical Pacific are among factors essentially contributing ENSO diversity.

El Nino-Southern Oscillation(ENSO)amplitudeInterdecadal Pacific Oscillation(IPO)ocean salinity variabilitytropical Pacificupper-ocean stratification

Hai ZHI、Xiaokun WANG、Rong-Hua ZHANG、Pengfei LIN、Jifeng QI

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College of Atmospheric Sciences,Nanjing University of Information Science and Technology,Nanjing 210044,China

School of Marine Sciences,Nanjing University of Information Science and Technology,Nanjing 210044,China

Laoshan Laboratory,Qingdao 266237,China

State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG),Institute of Atmospheric Physics(IAP),Chinese Academy of Sciences,Beijing 100029,China

Key Laboratory of Ocean Circulation and Waves,Institute of Oceanology,and Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao 266071,China

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National Natural Science Foundation of ChinaLaoshan Laboratory

42030410LSKJ202202403

2024

10.1007/s00343-023-3129-y

海洋湖沼学报(英文版)
中国海洋湖沼学会

海洋湖沼学报(英文版)

CSTPCD
影响因子：0.386
ISSN：2096-5508
年,卷(期)：2024.42(4)
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