Counteracting effects on ENSO induced by ocean chlorophyll interannual variability and tropical instability wave-scale perturbations in the tropical Pacific

Rong-Hua ZHANG ¹Feng TIAN ²Qidong SHI ³Xiujun WANG ⁴Tongwen WU⁵

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作者信息

1. School of Marine Sciences,Nanjing University of Information Science and Technology,Nanjing 210044,China;Laoshan Laboratory Qingdao 266237,China;University of Chinese Academy of Sciences,Beijing 101408,China
2. Laoshan Laboratory Qingdao 266237,China;Key Laboratory of Ocean Circulation and Waves,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China
3. Key Laboratory of Ocean Circulation and Waves,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;University of Chinese Academy of Sciences,Beijing 101408,China
4. Faculty of Geographical Sciences,Beijing Normal University Beijing 100875,China
5. Earth System Modeling and Prediction Centre,China Meteorological Administration,Beijing 100081,China
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Abstract

Large perturbations in chlorophyll(Chl)are observed to coexist at interannual and tropical instability wave(TIW)scales in the tropical Pacific;at present,their combined effects on El Niño-Southern Oscillation(ENSO)through ocean biology-induced heating(OBH)feedbacks are not understood well.Here,a hybrid coupled model(HCM)for the atmosphere and ocean physics-biogeochemistry(AOPB)in the tropical Pacific is adopted to quantify how ENSO can be modulated by Chl pertur-bations at interannual and TIW scales,individually or collectively,respectively.The HCM-based sensitivity experiments demonstrate a counteracting effect on ENSO:the bio-climate feedback due to large-scale Chl interannual variability acts to damp ENSO through its impact on upper-ocean stratification and vertical mixing,whereas that due to TIW-scale Chl perturbations tends to amplify ENSO.Because ENSO simulations are sensitively dependent on the ways Chl effects are represented at these different scales,it is necessary to adequately take into account these related differential Chl effects in climate modeling.A bias source for ENSO simulations is illustrated that is related with the Chl effects in the tropical Pacific,adding in a new insight into interactions between the climate system and ocean ecosystem on different scales in the region.These results reveal a level of complexity of ENSO modulations resulting from Chl effects at interannual and TIW scales,which are associated with ocean biogeochemical processes and their interactions with physical processes in the tropical Pacific.

Key words

Ocean chlorophyll/Bio-climate feedbacks/Interannual variability/Tropical instability waves/Counteracting effects/A hybrid coupled model

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基金项目

National Natural Science Foundation of China(42030410)

Laoshan Laboratory Program(LSKJ202202402)

Strategic Priority Research Program of the Chinese Academy of Sciences(XDB40000000)

Startup Foundation for Introducing Talent of NUIST()

Research Fund for Numerical Forecast Models of China Meteorological Administration(CXFZ2022M001)

National Natural Science Foundation of China(42006001)

Strategic Priority Research Program of the CAS(XDB42040100 & XDB42040103)

出版年

2024

中国科学:地球科学(英文版)

中国科学院

中国科学:地球科学(英文版)

影响因子：1.002

ISSN：1674-7313

参考文献量54

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