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3:30 p.m.
Atlantic Building Room 2400 & Zoom

AOSC Seminar by Dr. Riza Setiawan, 10/5/2023

AOSC Seminar

Dr. Riza Setiawan

Gadjah Mada University (Indonesia)


Title:The Fujiwhara Effect on the Enlarging Phytoplankton concentration in Southeastern Tropical Indian Ocean (SETIO) Region



A rare event known as Fujiwhara effect occurred in the southeastern tropical Indian Ocean (SETIO) when tropical cyclone (TC) Seroja and TC Odette were co-exist, interact each other, and merged into one TC in April 2021. Here, we used remotely sensed data [winds, sea surface temperature (SST), pressure, salinity, and chlorophyll-a concentration] and in situ data from meteorology stations and Argo floats to understand the impacts of Fujiwhara effect. Ekman transport and Ekman pumping velocity are calculated to quantify the upwelling strength. During the entire development of the TCs to the merging, the TCs induced upwelling through Ekman dynamics which enhanced the SST cooling (~3°C) and raising sea surface chlorophyll-a (~2 mg/m3) and shallowing the thermocline up to 10 m. The research on this rare event will add complexity of ocean and climate dynamics of the region as exit gate of the Indonesian throughflow to the Indian Ocean and may have implications to circulation and climate in the Indian Ocean and beyond.



Riza Setiawan is a faculty staff at the Department of Fisheries, Faculty of Agriculture, Universitas Gadjah Mada, Yogyakarta, Indonesia. He obtained a Ph.D. degree from the Department of Geosciences, University of Bremen, Germany in 2015. He got a M.Sc from the Department of Geophysics, the Graduate School of Science, Tohoku University, Japan in 2008. He has been working on scientific analyses of remote sensing and observational data to understand mesoscale atmosphere-ocean-land interaction in the Indonesian Maritime Continent.


Contact: Dwi Susanto

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AOSC Seminar

Pre-seminar refreshment: N/A
Seminar: 3:30-4:30pm, Room: ATL 2400(only when in-person)
Meet-the-Speaker: 4:30-5:00pm, Room: ATL 3400(only when in-person) [For AOSC Students only]

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