![]() Our additional analysis reveals that oceanic processes, especially horizontal advection, contribute most to intraseasonal variabilities during summer–fall. Then, we focused on the potential factors responsible for this seasonality. Using available satellite-derived oceanic and atmospheric data combined with output from a numerical model, we found that the intraseasonal variability of SST is greater during June–October than during November–May that is, seasonality occurs in the intraseasonal variability. Previous studies indicated energetic intraseasonal variability of sea surface temperature (SST) along the Sumatra-Java southern coast. Distinct dominance of atmospheric and oceanic processes in intraseasonal SST is the main reason for these differences in seasonal variation characteristics. Moreover, the result indicates that the seasonality in intraseasonal SST is different in the eastern Indonesian Seas, which tends to be relatively strong in boreal winter. Further analysis reveals that the alternating dominance of atmospheric and oceanic processes on intraseasonal variability of SST is responsible for the seasonality along the Sumatra-Java southern coast. The result also shows a relatively small contribution by vertical processes throughout the year, with the maximum in April and the minimum during August–September. Intraseasonal SST anomalies vary out of phase with surface wind anomalies. During winter–spring, the intraseasonal SST is primarily contributed by atmospheric processes but has a nonsignificant relationship with sea level anomalies. Meanwhile, the contribution of atmospheric processes drops by 67%. During this period, with the significantly increasing role of oceanic advection, oceanic processes are evidently enhanced and dominate the intraseasonal variability of SST. Composite analysis shows a correlation between positive/negative intraseasonal SST variabilities and coastal downwelling/upwelling, as well as onshore/offshore Ekman transport during summer–fall. The result reveals that the intraseasonal variability of SST is greater during boreal summer–fall (June–October) than during boreal winter–spring (November–May). This paper evaluates the intraseasonal variability of sea surface temperature (SST) along the Sumatra-Java southern coast using available satellite-derived oceanic and atmospheric data combined with output from a numerical model. ![]()
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