RESEARCH

Cloud Microphysics:

One of the most complete descriptions of a rainfall event is given by its drop size distribution (DSD) and its time-space variability. The DSD reflects the physics of rain. Due to its broad list of applications such as understanding of the microphysical mechanisms responsible for precipitation formation, microwave attenuation by rain, soil erosivity due to rainfall, and retrieval of rainfall properties using radar and other remote sensing techniques, much attention has been focused on observing and modeling DSD. In my group, the diurnal, intraseasonal, seasonal variations of raindrop are investigated using the disdrometer (Parsivel, 2D-Video Disdrometer) and Doppler radar which are installed along the equatorial region of Indonesia. This project is carried out under close collaboration with Prof. Toshiaki Kozu, Dr. Toyoshi Shimomai (RSL of Shimane University), Dr. Hiroyuki Hashiguchi, Dr. M. K. Yamamoto (RISH, Kyoto University), Dr. S. Mori and Prof. M. D. Yamanaka (JAMSTEC, Japan).

Cloud Propagation:

Maritime Continent of the Indonesian (MCI) archipelago is one of the world’s most convectively active areas and thereby affects the global climate system. It consists of thousands of islands with different size. The island coastlines’ complex shape and geography, as well as their orientation, contribute to the uniqueness of this region. Not surprisingly, maritime continent receives a large amount of rainfall throughout the year, and the precipitation varies considerably across the region. Global climate models exhibit systematic errors in their mean precipitation over the MCI due to such variability. In this study, the behavior of convective activity over MCI is examined using 1-hourly satellite infrared data. The dynamics of MCI weather systems remains poorly understood and part of the problem lies in the lack of atmospheric data and high-resolution gridded data analyses and realistic model simulations. Cloud propagation statistics (speed, span, life time, size, etc.) of the individual cloud “episodes” and the physical basis behind the results will be discussed. This project is carried out under close collaboration with Dr. Hiroyuki Hashiguchi, Dr. M. K. Yamamoto, Prof. M. Yamamoto (RISH, Kyoto University), Dr. S. Mori and Prof. M. D. Yamanaka (JAMSTEC, Japan), Richard E. Carbone, John D. Tuttle (National Center for Atmospheric Research, Boulder, Colorado, USA)

 Earthquake Precursor Observation:

Maritime Continent of the Indonesian (MCI) region is one of the most seismically active zones of the earth; at the same time it has a leading position from the point of view of active and potentially active volcanoes. People who live in a seismically active region of the world would like to know when an earthquake will occur. Tens of thousands of lives and damage to the structures and infrastructures could be saved, if early warning is available. This condition motivates us to take a part in effort to predict the earthquake through an earthquake precursor observation. The earthquake precursor is an anomalous phenomenon that might give effective warning of an impending earthquake. In my group, we focus on the thermal anomaly, earthquake cloud and perturbations in the lower ionosphere above the epicentral region.

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