La Niña Modoki Enhanced Summer-Autumn Precipitation over the Indonesian Region

다국어 초록 (Multilingual Abstract)

Possible impacts of the La Niña and La Niña Modoki on the precipitation over the Indonesian region were investigated in thisstudy. The analysis used monthly precipitation, sea surface temperature (SST), and pressure level wind for a period January1948 to December 2013. The results clearly show the change in the distribution of precipitation associated with the La NiñaModoki event. The results show a remarkable different impact of those two flavors of La Niña event on the precipitation overthe Indonesian region. During the boreal summer season in June-July-August (JJA) to boreal autumn season in September-October-November (SON), the La Niña Modoki caused a significant increase of precipitation almost all over the Indonesianregion, in particular over the Kalimantan, Sulawesi, Papua, and central to northern parts of Sumatra Islands. The conditioncontinued to the boreal winter season (December-January-February; DJF), although the affected regions were narrowercompared to those during previous two seasons. The enhanced precipitation was related to warmer SST anomalies in thesurrounding sea of the Indonesian region that triggered low-level wind convergence, and increased ascending convectivebranch of the Walker Circulation leading to enhanced atmospheric convection over the Indonesian region.

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