期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 838, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.155972
关键词
Tropical Pacific decadal variability; Upper-ocean heat content; Thermocline depth; Spatiotemporal evolution
资金
- Basic Scientific Fund for National Public Research Institutes of China [2018Q01]
- Natural Science Foundation of Shandong Province, China [ZR2021MD027]
- National Natural Science Foundation of China [41821004]
- project of Development of China-ASEAN blue partnership
The study found that the decadal variability in the tropical Pacific has a characteristic of propagating from the western Pacific to the eastern Pacific, and it is closely related to the western wind anomalies and the Pacific decadal oscillation. It also exhibits a nonlinear response during strong El Nino-Southern Oscillation (ENSO) events.
Tropical Pacific decadal variability (TPDV) and its mechanisms are essential for understanding long-term variations in global climate. The spatiotemporal pattern of this decadal variation has yet to be clarified. Here, on the basis of observational data with the help of the adaptive data analysis method, we extracted and investigated the spatiotemporal evolution of the tropical Pacific decadal variability in upper ocean heat content (UOHC) and thermocline depth. The tropical decadal signal propagated eastward along the equator from the western Pacific to the eastern Pacific after the 1970s, with a speed of 4-5 cm s(-1) yielding a decadal oscillation of approximately 11-13 years. This decadal variability of the thermocline fluctuations (UOHC) was proven to be closely correlated with western wind anomalies since the 1970s and may have been induced by the regime shift of the Pacific decadal oscillation. These peaks of decadal signals corresponded well with the strong El Nino-Southern Oscillation (ENSO) events, reflecting nonlinear rectification of ENSOs on TPDV. Moreover, the TPDV showed a modulating signal on moderate and weak ENSO events.
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