Abstract
Sunda Strait is a part of southern Java Sea influenced by the South Java Current (SJC) and the Java Sea current system. Java Sea current system provides fresh water run-off from Sumatra and Java and decreases salinity which can influence foraminiferal productivity. This research aims to understand the foraminiferal productivity record influenced by the water mass condition during Holocene. This research is conducted based on spectrophotometry and magnetic susceptibility measurement to unravel the physical properties, and foraminiferal distribution to unravel the ecological properties. The results indicate that paleoproductivity in the study area can be divided into three facies including salinity, sea surface temperature, and thermocline depth, driven by variability in upwelling, run-off intensity, and monsoonal changes. Facies I shows a relatively high abundance of Globigerina bulloides, indicating that paleoproductivity is influenced by upwelling and southeast monsoon, followed by dry paleoecology. Facies II shows a relatively shallow thermocline reflected by the extinction of Globorotalia crassaformis and decreasing Globorotalia hirsuta. In this facies, paleoproductivity is influenced by run-off that increases terrigenous influx controlled by the northwest monsoon. Facies III shows decreasing Globigerinoides as an oligotrophic dweller, and this indicates that the water has become eutrophic caused by increasing run-off. The northwest monsoon influences this increasing run-off.
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Acknowledgements
We would like to thank the Ministry of Marine Affairs and Fisheries Republic of Indonesia, the First Institute of Oceanography Ministry of Natural Resources of the People’s Republic of China, the National Research and Innovation Agency of Indonesia, and the Ministry of Energy and Mineral Resources Republic of Indonesia for permitting us to use the core BS-05 for primary data of this study. We would also like to thank the R/V “Geomarin III” crew for their help with board sampling.
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All authors are the main contributors to the article. EYB and MH conceived and wrote the initial draft of the paper; MH, RS, RAT, RZ, and EY discussed the results and modified the manuscript.
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Budiarto, E.Y., Hendrizan, M., Setijadi, R., Troa, R.A., Zuraida, R., Triarso, E. (2023). Foraminiferal Paleoproductivity During Holocene in Sunda Strait. In: Basit, A., et al. Proceedings of the International Conference on Radioscience, Equatorial Atmospheric Science and Environment and Humanosphere Science. INCREASE 2022. Springer Proceedings in Physics, vol 290. Springer, Singapore. https://doi.org/10.1007/978-981-19-9768-6_69
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