ITROSCO, SEMARANG – Final Group Presentation Day (31/8), another day of presentations is here. But for today, it’s a group presentation. There were 10 groups in ITroSCo 2021 and all the groups were assigned to their respective breakout rooms according to their schedule.

After all of the group had already done their presentation we had a very last lecture session by R. Dwi Susanto, Ph.D, moderated by Hendrik Anggi Setyawan, S.Pi., M.Si. Mr. Dwi Susanto talking about Understanding Sea Phenomenon in Indonesia, Ocean-Climate Dynamics of Indonesia Maritime Continent: Brief Overview. 

The Indonesia Maritime Continent is the world’s largest archipelago and provides the only low-latitude connection and chokepoint of the world’s oceans. The Indonesian throughflow (ITF) passes through complex bathymetry and coastline geometry with straits and narrow passages, linking the tropical Pacific and the Indian Ocean, influencing global ocean circulation, climate, and biogeochemistry. Hence, knowledge of the ITF — its spatial and temporal variability (mass, heat, freshwater/salt, and biogeochemistry) — is essential for understanding the role of the oceans in our planet’s climate system. Moreover, the IMC is a center of atmospheric convection that drives the Walker Circulation. Ocean-land-atmosphere interactions within the IMC may contribute to the initiation and development of extreme climate events associated with El Nino Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD).

Consequently, the IMC is strongly impacted by these extreme climate swings. Oceanic/atmospheric climatic processes associated with Madden Julian Oscillation, Asia-Australian monsoon, oceanic Kelvin, and Rossby waves are affecting the ocean/climate dynamics of the Indonesian seas. The southward ITF toward the Indian Ocean varies from 0 to 22Sv (1Sv = 106 m3 s-1 ), with the annual mean of Pacific/Indian Ocean exchange/ITF transport is 15Sv and modulated by Kelvin waves, monsoon, ENSO, and IOD. Less throughflow during El Nino and IOD positive, and more throughflow during La Nina & IOD negative. In situ measurements of ITF have been conducted in the last thirty years, however, mostly at different passages and times, and the simultaneous measurements in the inflow and outflow passages last for less than four years. ITF measurements are logistically challenging and expensive; therefore, ITF proxies are desirable. (Committee of ITroSCo 2021)

~ ItroSCo 2021 committee ~

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