Characteristics of rainfall over Jakarta and its surroundings observed by Global Precipitation Measurement (GPM)-IMERG data

Over the Jakarta region, research on variability of local rainfall is very few due to relatively sparse observational datasets available. On the other hand, understanding the development of localized rainfall is necessary, particularly for reducing floods associated with heavy rainfall that commonly occur in the region. This study investigates the characteristics of rainfall using high spatial (0.1° x 0.1°) and temporal (30 minutes) resolutions of Global Precipitation Measurement (GPM)-IMERG data during 2009-2012. We found that this dataset is beneficial to examine spatial characteristics of local rainfall over the region. The peak of diurnal cycle of rainfall is larger in the rainy season Dec-Feb (DJF) compared to other seasons and is consistent with the results from weather radar. Background atmospheric conditions have shown that in DJF, a higher rainfall magnitude and frequency over the region are persistent over the mountain and are coincident with a stronger updraft of the air and dominant westerly wind. The GPM-IMERG data might be helpful in analyzing relatively detailed spatial rainfall, particularly in other parts of region over the Indonesian Maritime Continent (IMC) where dense observational datasets are spatially limited.