Tropical cyclones and its impact on seasonal downwelling/upwelling in southern Indonesia waters Avrionesti, M. RIdwan Prasetya, M. Riam Badriana
Sekolah Tinggi Meteorologi Klimatologi dan Geofisika
Abstract
The southern region of Indonesia is one of the places where tropical cyclones grow in the southern hemisphere. In the period 1992 - 2022 there were approximately 216 tropical cyclones that occurred in the southern waters of Indonesia with 85 of them falling into the category of cyclones 1 - 5 based on Saffir-Simpson scale. Apart from cyclones, southern Indonesia waters also experienced other oceanographic phenomena, seasonal upwelling and downwelling. This study aims to determine the effect of cyclones on physical conditions in southern Indonesia waters during the seasonal upwelling/downwelling period. Historical data shows that tropical cyclones in southern Indonesia generally occur in the DFJ month and almost never occur in the JJA month. Meanwhile, the upwelling (downwelling) period occurs during the JJA (DJF) season. The results show that in general, cyclones cause mixing in the upper layers of the sea, although it does not always have an impact on the emergence of upwelling in the path they pass.
