Study of relationship between wave transport and sea surface temperature anomaly (SSTA) in the tropical Pacific
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Study of relationship between wave transport and sea surface temperature anomaly (SSTA) in the tropical Pacific SHI Yongfang1, WU Kejian2*, ZHU Xianye2, YANG Fan2, ZHANG Yuming3 1 Key Laboratory of Marine Science and Numerical, The First Institute of Oceanography, State Oceanic
Administration, Qingdao 266061, China 2 College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China 3 National Marine Environmental Monitoring Center, State Oceanic Administration, Dalian 116023, China
Received 2 June 2015; accepted 28 January 2016 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2016
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. Key words: wave transport, eastern equatorial Pacific, sea surface temperature anomaly, warm events Citation: 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, doi: 10.1007/s13131-016-0928-4
1 Introduction Despite numerous studies concerning the sea surface temperature (SST) variability in the equatorial Pacific, especially in the eastern equatorial Pacific (EEP, 5°S–5°N, 150°–90°W), which is closely related to the atmospheric circulation, no definite conclusion has yet been made regarding the mechanisms that is responsible for this variability. It seems that the sea surface temperature anomaly (SSTA) in the EEP is directly induced
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