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Variation of Asia-Australia Monsoon to Mesoscale Convective System on East Java a) b) e) Department of Geomatics Engineering, Sepuluh Nopember Institute of Technology Abstract Indonesia maritime continent with strong convection activities triggers the formation of clouds that can develop and evolution into systems on larger scale in the form of Mesoscale Convective System (MCSs). It can trigger extreme weather that effect to hidrometeorological disasters, such as extreme rain, heavy thunderstorm, and gale wind. The Asian-Australian monsoon has an important influence in determining activities of MCSs in the East Java. The data are weather satellite of Himawari, zonal wind and meridional wind ECMWF 850 mb. Determination of the MCSs follows the physical characteristics in the Maddox algorithm and the AUSMI index follows the Kajikawa algorithm. The method used is quantitative analysis of coefficient of correlation and determination, and qualitative in the form of descriptive analytic. It can be know that the Asian-Australian monsoon have low influence on the MCSs in the East Java. AUSMI index has the same pattern and phase with frequency of MCSs on a monthly or seasonal (period 2014-2018). However, time of maximum and minimum frequencies event tends to be faster than the event of Asian and Australian monsoons. The frequency of 25-250 km is more dominant than 250-2500 km and the foremost life duration is 1-3 hours. The spatial distribution of 25-250 km is more evenly distributed than MCSs 250-2500 which only occur at certain times and point. The area that has a strong intensity of the occurrence of the most dominant MCSs is Southeastern Java. Keywords: MCSs- Monsoon- AUSMI Topic: Atmospheric Sciences |
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