NAME =  Ms. SAKURAI Namiko  
ORGANIZATION =  Graduate School of Science and Technology, Kobe University  
ADDRESS =  1-1 Rokkodai-cho Nada-ku Kobe-shi Hyogo Japan 657-8501  
COUNTRY =  Japan  
PHONE =  +81-78-5787  
FAX =  +81-78-5787  
E-MAIL =  sakurai@ahs.scitec.kobe-u.ac.jp  
POSTER_ONLY =  no  
THEME =  T3  
DATE =  09-Aug-04-20:04:52  
ABSID = T3MSN09Aug04200452 
TITLE = Interannual variations of cloud system migration with diurnal cycle over Sumatera Island 
AUTHOR_1 = Namiko SAKURAI 
INSTITUTION_1 = Graduate School of Science and Technology, Kobe University 
PRESENTER = AUTHOR_1 
AUTHOR_2 = Fumie MURATA 
INSTITUTION_2 = Research Institute for Human and Nature 
AUTHOR_3 = Manabu D. YAMANAKA 
INSTITUTION_3 = Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology 
AUTHOR_4 = Shuichi MORI 
INSTITUTION_4 = Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology 
AUTHOR_5 = HAMADA Jun-Ichi 
INSTITUTION_5 = Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology 
AUTHOR_6 = Hiroyuki HASHIGUCHI 
INSTITUTION_6 = Research Institute for Sustainable Humanosphere, Kyoto University 
AUTHOR_7 = Yudi Iman Tauhid 
INSTITUTION_7 = Agency for the Assessment and Application of Technology 
AUTHOR_8 = Tien Sribimawati 
INSTITUTION_8 = Agency for the Assessment and Application of Technology 
AUTHOR_9 = Budi Suhardi 
INSTITUTION_9 = Indonesian Meteorological and Geophysical Agency 
ABSTRACT =   We have described a systemstic cloud migration with diurnal cycle over Sumatera Island (northward-southward length ¡«1,500 km), based on GMS IR1 data and intense observations with rawinsondes and a wind profiler. Cloud systems start growing up to 11 km in the mountainous area in the western part of Sumatera Island in the afternoon, and migrate for a distance of several hundreds kilometers both westward and eastward from night to morning.
 By a climatological analysis for one year (May 2001 ¨C April 2002), the westward migration with diurnal cycle appears in almost all the seasons and almost all over the western part of Sumatera, except for August in the southern end, whereas the eastward migration with diurnal cycle is observed only in a zone which is shifted northward and southward with an annual cycle. The zone where the eastward migration appears is identified with ITCZ approximately. For the eastward migration we consider that it is related to features in ITCZ; westerly wind in the lower troposphere is dominant and super cloud clusters are moving eastward in ITCZ around 100oE.
 We will investigate Interannual variations of diurnal cylce of eastward migration, and show it mainly in the presentation.