首页|Impacts of central-Pacific El Nino and physical drivers on eastern Pacific bigeye tuna

Impacts of central-Pacific El Nino and physical drivers on eastern Pacific bigeye tuna

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
Bigeye tuna Thunnus obesus is an important migratory species that forages deeply,and El Nino events highly influence its distribution in the eastern Pacific Ocean.While sea surface temperature is widely recognized as the main factor affecting bigeye tuna(BET)distribution during El Nino events,the roles of different types of El Nino and subsurface oceanic signals,such as ocean heat content and mixed layer depth,remain unclear.We conducted A spatial-temporal analysis to investigate the relationship among BET distribution,El Nino events,and the underlying oceanic signals to address this knowledge gap.We used monthly purse seine fisheries data of BET in the eastern tropical Pacific Ocean(ETPO)from 1994 to 2012 and extracted the central-Pacific El Nino(CPEN)indices based on Nino 3 and Nino 4 indexes.Furthermore,we employed Explainable Artificial Intelligence(XAI)models to identify the main patterns and feature importance of the six environmental variables and used information flow analysis to determine the causality between the selected factors and BET distribution.Finally,we analyzed Argo datasets to calculate the vertical,horizontal,and zonal mean temperature differences during CPEN and normal years to clarify the oceanic thermodynamic structure differences between the two types of years.Our findings reveal that BET distribution during the CPEN years is mainly driven by advection feedback of subsurface warmer thermal signals and vertically warmer habitats in the CPEN domain area,especially in high-yield fishing areas.The high frequency of CPEN events will likely lead to the westward shift of fisheries centers.

bigeye tunacentral-Pacific El Nino(CPEN)ocean heat contentArgoexplainable artificial intelligence(XAI)information flow

Peng LIAN、Le GAO

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Key Laboratory of Ocean Observation and Forecasting and Key Laboratory of Ocean Circulation and Waves,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China

University of Chinese Academy of Sciences,Beijing 100049,China

Marine Science and Technology Fund of Laoshan Laboratory(Qingdao)国家自然科学基金国家自然科学基金国家自然科学基金

LSKJ2022043024209004442376175U2006211

2024

10.1007/s00343-023-3051-3

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(3)