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Interdecadal variability in the tropical Indian Ocean and its dynamic explanation
Authors:Dongxiao Wang  Guoxiong Wu  Jianjun Xu
Institution:(1) LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, 100080 Beijing, China;(2) Present address: Physical Oceanography Program, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 510301 Guangzhou, China
Abstract:Interdecadal variability in the tropical Indian Ocean has been analyzed based on the long-term climatic observational data. Case study showed that strong interannual signals formed at the surface can penetrate the depth of seasonal thermocline, where the anomalies last a couple of years. Artificial time series based on damping with exponential decay of selected strong events agree well with the detected interdecadal variability in the tropical Indian Ocean. A possible dynamic explanation for interdecadal variability in the tropical Indian Ocean was proposed that irregular interannual signals can lead to a slowly evolving climatic background with the interdecadal time scale through damping of the memory about anomalies in the seasonal thermocline.
Keywords:tropical Indian Ocean  interdecadal variability  memory
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