The dynamics of negative Indian Ocean Dipole (nIOD) and its relation to the anomalous high rainfall in West Java Province, Indonesia

International Conference On Tropical Meteorology And Atmospheric Sciences

生态环境科学;原子能学

Hatmaja, R.B.^1 ; Rusmanansari, A.H.^2 ; Radjawane, I.M.^1

Earth Sciences Department, Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Jl. Ganeca no. 10, Bandung - West Java

40135, Indonesia^1

Meteorology Department, Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Jl. Ganeca no. 10, Bandung - West Java

40135, Indonesia^2

关键词: Composite analysis;    Dipole mode indices;    Indian Ocean dipole;    Indian ocean dipoles;    Meteorological disasters;    Sea surface temperature (SST);    Vulnerable regions;    West javas;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/303/1/012004/pdf
DOI  :  10.1088/1755-1315/303/1/012004

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

West Java Province is the most vulnerable region to hydro-meteorological disasters (i.e. flood and landslide) in Indonesia. One of the main causes of these disasters is high level of rainfall. There were many global phenomena caused an increase in rainfall level in Indonesia, one of them was the Indian Ocean Dipole (IOD), especially its negative phase. By using the Dipole Mode Index (DMI), IOD strength or intensity can be determined. Besides, the composite analysis of anomalous sea surface temperature (SST), wind, and rainfall were constructed to examine the dynamics of the negative IOD and its relation to the high rainfall level in West Java. During the negative IOD (nIOD), the significant positive (negative) anomalous SST appeared around May in eastern (western-central) of Indian Ocean. The intensity of anomalous SST in the following months reached its peak in September and accompanied by strong anomalous north-westerly wind. Furthermore, the high SST and anomalous wind increased the convection activity in the southern Java Island, and consequently, the level of rainfall in West Java increased up to 8.92 mm/day and may lead the risk of hydro-meteorological disaster.