| SHI Yongfang,WU Kejian,ZHU Xianye,YANG Fan,ZHANG Yuming. 2016. Study of relationship between wave transport and sea surface temperature anomaly (SSTA) in the tropical Pacific. Acta Oceanologica Sinica, 35(9):58－66 |
| Study of relationship between wave transport and sea surface temperature anomaly (SSTA) in the tropical Pacific |
| 热带太平洋波浪输运与海表面温度异常关系研究 |
| Received:June 02, 2015 Revised:January 28, 2016 |
| DOI：10.1007/s13131-016-0928-4 |
| Key words:wave transport eastern equatorial Pacific sea surface temperature anomaly warm events |
| 中文关键词: 波浪输运 赤道东太平洋 SST异常 暖事件 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | SHI Yongfang | Key Laboratory of Marine Science and Numerical, The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | WU Kejian | College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China | kejianwu@ouc.edu.cn | | ZHU Xianye | College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China | | | YANG Fan | College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China | | | ZHANG Yuming | National Marine Environmental Monitoring Center, State Oceanic Administration, Dalian 116023, China | |
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| Abstract: |
| Large-scale water transport is one of the key factors that affect sea surface temperature anomaly (SSTA) in the eastern equatorial Pacific (EEP). The relationship between the wave transport in the tropical Pacific and the SSTA in the EEP is examined by different methods, including band-pass filtering, period analysis, correlation analysis, significant analysis, and empirical orthogonal function (EOF) analysis. We have found that the eastward shift of the wave transport anomaly in the tropical Pacific, with a period of 2 a and enhancing the transport of warm waters from the western Pacific warm pool, precedes the increase of sea surface temperature (SST) in the EEP. The wave transport and the SSTA in the EEP have a maximum correlation of 0.65 with a time-lag of 6 months (transport variation precedes the temperature). The major periods (3.7 a and 2.45 a) of the wave transport variability, as revealed by the EOF analysis, appear to be consistent with the SSTA oscillation cycle in the EEP. Based on the first occurrence of a significant SSTA in the Niño 3 region (5°S-5°N, 90°-150°W), two types of warm events are defined. The wave transport anomalies in two types present predominantly the west anomaly in the tropical Pacific, it is that the wave transport continues transport warm water from west to east before the onset of the warm event. The impact of wave-induced water transport on the SSTA in the EEP is confirmed by the heat flux of the wave transport. The wave transport exerts significant effect on the SSTA variability in the EEP and thus is not neglectable in the further studies. |
| 中文摘要: |
| 大尺度水体输运是影响赤道东太平洋SST异常的关键因素之一，本文旨在关注热带太平洋波浪诱导的水体输运与赤道东太平洋海温异常的相关关系。本文采用数据分析的研究手段，主要使用了低通滤波、谱分析、相关性分析、显著性分析及EOF分解等多种数据统计方法，分析结果表明：热带太平洋的波浪输运距平存在东向传输的特点，且具有2年左右的周期。在赤道东太平洋异常增暖前，波浪持续的由西向东的输运量高于正常值。EOF分析显示：波浪输运主要模态的变化周期为3.7、2.45年，与赤道东太平洋SST异常的振荡周期吻合。以Nino3指数代表赤道东太平洋的SST异常，并定义了暖事件的发生时间，根据发生时间的不同又划分了春季型和夏季型。二者波浪输运主要呈西向异常，即赤道东太平洋的暖事件爆发前，波浪输运持续向东输运暖水。通过波浪输运热通量的计算，进一步说明了波浪诱导的大尺度水体输运对赤道东太平洋SST异常变化的贡献。二者相关关系显示：沿赤道的波浪输运超前于SST异常6个月时，相关性最大，相关系数为0.65。作为水体输运的重要部分，波浪输运对赤道东太平洋SST异常的影响不可忽略。 |
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