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Impacts of the annual cycle of background SST in the tropical Pacific on the phase and amplitude of ENSO

Song Jiang Congwen Zhu Ning Jiang

大气和海洋科学快报（英文版）2025，Vol.18Issue(1)：12-17,6.
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大气和海洋科学快报（英文版）2025，Vol.18Issue(1)：12-17,6.DOI:10.1016/j.aosl.2024.100496

Impacts of the annual cycle of background SST in the tropical Pacific on the phase and amplitude of ENSO

Impacts of the annual cycle of background SST in the tropical Pacific on the phase and amplitude of ENSO

Song Jiang 1Congwen Zhu 1Ning Jiang2

作者信息

  • 1. State Key Laboratory of Severe Weather(LASW),Chinese Academy of Meteorological Sciences,Beijing,China||College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing,China
  • 2. State Key Laboratory of Severe Weather(LASW),Chinese Academy of Meteorological Sciences,Beijing,China
  • 折叠

摘要

Abstract

基于1982-2022年资料分析,本文发现,热带太平洋海温年循环的主导模态为反对称模式,是ENSO发展的背景场.然而,其对ENSO相位和振幅的异常影响尚未可知.反对称模态异常可以通过Bjerknes反馈影响ENSO的年际变化,其正(负)异常可以通过更早(更晚)的季节循环转变时间和更大(更小)的年平均值增强冬季El Nino(La Nina)的强度.根据随机敏感性实验分析,与反对称模态变化有关的赤道中东太平洋海温异常可达±0.3℃以上.研究结果为背景海温年循环对ENSO的影响提供了新的见解,这可能对ENSO的预测具有重要意义.

关键词

年循环/海表面温度异常/反对称模态/ENSO

Key words

Annual cycle/SST anomaly/Antisymmetric mode/ENSO

引用本文复制引用

Song Jiang,Congwen Zhu,Ning Jiang..Impacts of the annual cycle of background SST in the tropical Pacific on the phase and amplitude of ENSO[J].大气和海洋科学快报（英文版）,2025,18(1):12-17,6.

基金项目

This study was jointly supported by the National Natural Science Foundation of China[grant numbers U2242205 and 41830969],the S&T Development Fund of CAMS[grant number 2023KJ036],and the Basic Scientific Research and Operation Foundation of CAMS[grant number 2023Z018]. （）

大气和海洋科学快报（英文版）

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