Abstract
AbstractThis study investigates the origins of intraseasonal rainfall variations over the southern South China Sea (SCS) region in boreal winter. It is found that intraseasonal rainfall variations over the southern SCS have different origins on the 10–20-day and 30–60-day time scales. On the 10–20-day time scale, large rainfall anomalies over the southern SCS are preceded by strong northerly wind anomalies associated with the East Asian winter monsoon (EAWM), by about two days. On the 30–60-day time scale, the strong EAWM-related northerly wind anomalies almost appear simultaneously with large rainfall anomalies over the southern SCS. In addition, obvious large rainfall anomalies occur over the southeastern tropical Indian Ocean about one week before the peak southern SCS rainfall anomalies. It indicates that the convection and related circulation anomalies with origins over the tropical Indian Ocean may play an important role in inducing intraseasonal rainfall variations over the southern SCS on the 30–6...
Highlights
The intraseasonal oscillation (ISO) is one of the most significant signals over the tropical Indian Ocean, the Maritime Continent, and the tropical western Pacific regions
On the 30–60-day time scale, the wind anomalies associated with the East Asian winter monsoon (EAWM) and Madden–Julian oscillation (MJO) from the tropical Indian Ocean may both contribute to the intraseasonal variations of rainfall over the southern South China Sea (SCS)
Large standard deviations of intraseasonal rainfall anomalies are observed in the southern SCS, southeastern Indian Ocean, and east of the Philippines
Summary
The intraseasonal oscillation (ISO) is one of the most significant signals over the tropical Indian Ocean, the Maritime Continent, and the tropical western Pacific regions. It is expected that the intraseasonal rainfall variations around the Maritime Continent, including the southern South China Sea (SCS), may be largely linked to those from the tropical Indian Ocean, in particular during boreal winter when the MJO signal is the strongest near the equator. The present study investigates the association of the intraseasonal rainfall variations over the southern SCS with the MJO and the EAWM. The present study attempts to investigate whether the origins of intraseasonal rainfall variations over the southern SCS are different on the 10–20-day and 30–60-day time scales during boreal winter.
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