Drought recorded by Ba∕Ca in coastal benthic foraminifera
Abstract Ba/Ca) of foraminiferal calcium carbonates accumulating in sediments. However, so far the use of Ba/Ca as a discharge indicator has been restricted to planktonic foraminifera, despite the high relative abundance of benthic species in coastal, shallow-water sites. Moreover, benthic foraminiferal Ba/Ca has mainly been used in open-ocean records as a proxy for paleo-productivity. Here we report on a new geochemical data set measured from living (CTG-labeled) benthic foraminiferal species to investigate the capability of benthic Ba/Ca to record changes in river runoff over a gradient of contrasting hydroclimatic conditions. Individual foraminifera (Bulimina marginata Ba/Ca correlates significantly to riverine runoff; however, the signals contain both spatial trends with distance to Ba source and species-specific influences such as micro-habitat preferences. We deduce that shallow-infaunal foraminifera are especially suitable as proxy for terrestrial Ba input and discuss the potential influence of water-column and pore-water Ba cycling. While distance to Ba source, water depth, pore-water geochemistry, and species-specific effects need to be considered in interpreting the data, our results demonstrate confidence in the use of Ba/Ca of benthic foraminifera from near-continent records as a proxy for past riverine discharge and to identify periods of drought.
- Standort
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Deutsche Nationalbibliothek Frankfurt am Main
- Umfang
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Online-Ressource
- Sprache
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Englisch
- Erschienen in
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Drought recorded by Ba∕Ca in coastal benthic foraminifera ; volume:19 ; number:9 ; year:2022 ; pages:2523-2535 ; extent:13
Biogeosciences ; 19, Heft 9 (2022), 2523-2535 (gesamt 13)
- Urheber
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Brinkmann, Inda
Barras, Christine
Jilbert, Tom
Næraa, Tomas
Paul, K. Mareike
Schweizer, Magali
Filipsson, Helena L.
- DOI
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10.5194/bg-19-2523-2022
- URN
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urn:nbn:de:101:1-2022051905340301250835
- Rechteinformation
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Letzte Aktualisierung
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15.08.2025, 07:29 MESZ
Datenpartner
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Beteiligte
- Brinkmann, Inda
- Barras, Christine
- Jilbert, Tom
- Næraa, Tomas
- Paul, K. Mareike
- Schweizer, Magali
- Filipsson, Helena L.
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