热带海洋学报 ›› 2024, Vol. 43 ›› Issue (5): 1-16.doi: 10.11978/2023150CSTR: 32234.14.2023150

• 海洋水文学 •    下一篇

AMO对ENSO与初夏西太平洋海洋热浪年际关系的年代际调制作用*

袁钰1,2(), 徐海明1,2(), 马静1,2, 张彤1,2   

  1. 1.南京信息工程大学气象灾害预报预警与评估协同创新中心/气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室, 江苏 南京 210044
    2.南京信息工程大学大气科学学院, 江苏 南京 210044
  • 收稿日期:2023-10-16 修回日期:2023-12-14 出版日期:2024-09-10 发布日期:2024-10-10
  • 作者简介:

    袁钰(1998—), 女, 新疆维吾尔自治区吉木乃县人, 硕士, 从事海气相互作用研究。email:

    *感谢3位匿名审稿人和编辑提出宝贵的意见。

  • 基金资助:
    国家自然科学基金项目(42192562); 国家自然科学基金项目(41975106)

Impact of Atlantic Multidecadal Oscillation on interannual relationship between ENSO and early summer marine heatwaves in the Western Pacific*

YUAN Yu1,2(), XU Haiming1,2(), MA Jing1,2, ZHANG Tong1,2   

  1. 1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CICFEMD) / Key Laboratory of Meteorological Disaster, Ministry of Education (KLME) / Joint International Research Laboratory of Climate and Environment Change (ILCEC), Nanjing University of Information Science and Technology, Nanjing 210044, China
    2. College of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 210044, China
  • Received:2023-10-16 Revised:2023-12-14 Online:2024-09-10 Published:2024-10-10
  • Supported by:
    National Natural Science Foundation of China(42192562); National Natural Science Foundation of China(41975106)

摘要:

海洋热浪是发生在海洋上的极端高温事件, 对海洋环境和生态系统具有破坏性影响。文章采用1960—2020年第五代欧洲中期天气预报中心再分析资料(European centre for medium-range weather forecasts reanalysis v5, ERA5)和英国气象局哈德来中心全球海冰和海洋表面温度资料集(Hadley centre global sea ie and sea surface temperature, HadISST)以及地球系统模式(community Earth system model, CESM1)北大西洋理想试验数据等, 通过相关、合成分析等多种统计方法, 研究了厄尔尼诺-南方涛动(El Niño-Southern Oscillation, ENSO)与次年初夏西太平洋海洋热浪年际关系的变化特征, 并进一步探讨了二者关系发生年代际变化的可能成因。研究结果表明: 1) ENSO与次年初夏西太平洋海洋热浪月数的年际关系具有明显的年代际变化特征, 北大西洋多年代际振荡(Atantic multidecadal oscillation, AMO)是二者年际关系发生年代际变化的主要成因。当AMO处于正位相时, ENSO与次年初夏西太平洋海洋热浪存在显著的正相关关系, 而当AMO处于负位相时, 上述二者相关关系不再显著; 2) AMO主要通过调控ENSO事件的强度进而影响西北太平洋大气环流的异常响应, 从而进一步影响ENSO与次年初夏西太平洋海洋热浪之间的关系。当AMO处于负(正)位相时, 相对较强(弱)的ENSO事件通过强(弱)风-蒸发-海温正反馈过程, 使得ENSO事件次年初夏西北太平洋地区产生位置相对偏东(西)、强度相对偏强(弱)的异常反气旋/气旋。异常反气旋/气旋的位置和强度导致初夏西太平洋海洋热浪的分布在AMO正、负位相存在显著差异。

关键词: 初夏海洋热浪, 西太平洋, 北大西洋多年代际振荡, 厄尔尼诺-南方涛动, 西北太平洋异常气旋/反气旋

Abstract:

Marine heatwaves are extreme high temperature events that occur on the oceans and have devastating impact of marine environment and ecosystems. Using the fifth generation of European centre for medium-range weather forecasts atmospheric reanalysis data (ERA5) and the Hadley Centre Global Sea Ice and Sea Surface Temperature (HadISST) dataset during the period of 1960-2020, and data from the North Atlantic idealized experiments performed with the CESM1 model, this study investigated the variation of the interannual relationship between the El Niño-Southern Oscillation (ENSO) and the following early summer marine heatwaves in the western Pacific, and the possible reasons for their decadal variation based on correlation, synthetic analysis and other statistical methods. The results are shown as follows. 1) The interdecadal relationship between the ENSO and the following early summer marine heatwaves months in the western Pacific displays a prominent decadal variation, which is modulated by the Atlantic Multidecadal Oscillation (AMO). A high correlation between the ENSO and the following early summer marine heatwaves in the western Pacific appears during the positive AMO phase, while no significant correlation is found during the negative AMO phase. 2) AMO mainly affects the response of atmospheric circulation in the Northwest Pacific by modulating ENSO amplitude, thereby affecting the relationship between the ENSO and the following early summer marine heatwaves in the western Pacific. During the negative (positive) AMO phases, the Northwest Pacific anomalous anticyclone/cyclone appears strong (weak), and its position shifts toward east (west) in the following early summer, due to the relatively strong (weak) ENSO events through strong (weak) wind-evaporation-SST positive feedback mechanism. Thus, the position and intensity of anomalous anticyclones/cyclones led to significant differences in the distribution of early summer marine heatwaves in the western Pacific between the positive and negative AMO phase.

Key words: early summer marine heatwaves, western Pacific, ENSO, AMO, Northwest Pacific anomalous anticyclone/cyclone