Assessing the Reliability of Planktic Foraminifera Ba/Ca as a Proxy for Salinity off the Sunda Strait

Setiawan, Riza Yuliratno and Wirasatriya, Anindya and Shaari, Hasrizal Bin and Setyobudi, Eko and Rachman, Faizal (2017) Assessing the Reliability of Planktic Foraminifera Ba/Ca as a Proxy for Salinity off the Sunda Strait. International Journal of Marine Sciences (IJMS), 22 (4). pp. 201-212. ISSN 0853 - 7291

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The Ba/Ca ratio of planktic foraminifera carbonate serves as a new geochemical proxy for seawater Ba/Ca and thus providing information on modern and past salinity and freshwater discharge. In this study the applicabili ty of Ba/Ca ratio of core-top Globigerinoides sacculifer collected off the eastern tropical Indian Ocean (ETIO) for paleoceanographic reconstructions was investigated. In doing so, we conducted a series of cleaning experiments for Ba/Ca extraction by using different reductive solutions. Our new results suggest that the Ba/Ca ratio of G. sacculifer cannot be utilized as a tracer for modern and past salinity changes in the ETIO region off the Sunda Strait. We suggest that the existence of seasonal upwelling adds an addi tional signal to the seawater Ba/Ca in the ETIO, and thus complicates the interpretation of G. sacculifer Ba/Ca as a freshwater tracer. Moreover, our cleaning experiment results show that the cleaning protocol of Mg/Ca, DTPA, and hydroxylamine can be used to extract valuable Ba/Ca ratios from planktic foraminifera tests.

Item Type:Article
Uncontrolled Keywords:G. sacculifer Ba/Ca, foraminifera cleaning experiments, the Sunda Strait
Subjects:S Agriculture > SH Aquaculture. Fisheries. Angling
Divisions:Faculty of Fisheries and Marine Sciences > Department of Marine Science
ID Code:69079
Deposited On:29 Jan 2019 07:27
Last Modified:29 Jan 2019 07:27

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