Bottom foraminiferal assemblages in the Deryugin Basin (Sea of Okhotsk) during the past 26000 years

Burmistrova, I. I.; Belyaeva, N. V.

doi:10.1134/s0001437006060087

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…Comparing the geochemical records to the benthic assemblages, we can observe similar patterns. Schmiedl et al, 2000;Mackensen, 2006, 2008), while G. orbicularis and G. soldanii are associated with welloxygenated and oligotrophic environments (Peterson, 1984;Burmistrova and Belyaeva, 2006;De and Gupta, 2010). Thus, assemblage 3 reflects mesotrophic environments and/or well-ventilated conditions during the last deglaciation.…”

Section: Comparison Between Geochemical Records and Benthic Foraminifmentioning

confidence: 99%

Changes in productivity and intermediate circulation in the northern Indian Ocean since the last deglaciation: new insights from benthic foraminiferal Cd / Ca records and benthic assemblage analyses

Ma¹,

Sépulcre²,

Licari³

et al. 2020

Preprint

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Abstract. We have measured Cd / Ca ratios of several benthic foraminiferal species and studied benthic foraminiferal assemblages on two cores from the northern Indian Ocean (Arabian Sea and northern Bay of Bengal, BoB), in order to reconstruct variations in intermediate water circulation and paleo-nutrient content since the last deglaciation. Intermediate water Cdw records estimated from the benthic Cd / Ca reflect past changes in surface productivity and/or intermediate-bottom water ventilation. The benthic foraminiferal assemblages are consistent with the geochemical data. These results suggest that during the last deglaciation, the Heinrich Stadial 1 and Younger Dryas (HS1 and YD, respectively) millennial-scale events were marked by a decrease in Cdw values, indicating an enhanced ventilation of intermediate-bottom water masses. Benthic foraminifer assemblages indicate that surface primary productivity was low during the early Holocene (from 10 to 6 cal kyr BP), resulting in low intermediate water Cdw at both sites. From ~ 5.2 to 2.4 cal kyr BP, the benthic foraminiferal assemblages indicate meso- to eutrophic intermediate water conditions, which correspond to high surface productivity. This is consistent with a significant increase in the intermediate water Cdw in the southeastern Arabian Sea and the northeastern BoB. The comparison of intermediate water Cdw records with previous reconstructions of past Indian monsoon evolution during the Holocene suggests a direct control of intermediate water Cdw by monsoon-induced changes in upper water stratification and surface primary productivity.

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Section: Comparison Between Geochemical Records and Benthic Foraminifmentioning

confidence: 99%

Changes in productivity and intermediate circulation in the northern Indian Ocean since the last deglaciation: new insights from benthic foraminiferal Cd / Ca records and benthic assemblage analyses

Ma¹,

Sépulcre²,

Licari³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…3 and S2). S. bulloides and B. mexicana are found in intermediate to high organic carbon flux rate regions (e.g., Schmiedl et al, 2000;Eberwein andMackensen, 2006, 2008), while G. orbicularis and G. soldanii are associated with well-oxygenated and oligotrophic environments (Peterson, 1984;Burmistrova and Belyaeva, 2006;De and Gupta, 2010). Thus, assemblage 3 reflects mesotrophic environments and/or well-ventilated conditions during the last deglaciation.…”

Section: Comparison Between Geochemical Records and Benthic Foraminif...mentioning

confidence: 99%

Changes in productivity and intermediate circulation in the northern Indian Ocean since the last deglaciation: new insights from benthic foraminiferal Cd ∕ Ca records and benthic assemblage analyses

Sépulcre

Licari

et al. 2022

Clim. Past

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Abstract. We have measured Cd/Ca ratios of several benthic foraminiferal species and studied benthic foraminiferal assemblages on two cores from the northern Indian Ocean (Arabian Sea and northern Bay of Bengal, BoB), in order to reconstruct variations in intermediate-water circulation and paleo-nutrient content since the last deglaciation. Intermediate water Cdw records estimated from the benthic Cd/Ca reflect past changes in surface productivity and/or intermediate–bottom-water ventilation. The benthic foraminiferal assemblages are consistent with the geochemical data. These results suggest that during the last deglaciation, Cdw variability was primarily driven by changes in intermediate-water properties, indicating an enhanced ventilation of intermediate–bottom water masses during both Heinrich Stadial 1 and the Younger Dryas (HS1 and YD, respectively). During the Holocene, however, surface primary productivity appears to have influenced Cdw more than intermediate water mass properties. This is evident during the early Holocene (from 10 to 6 cal ka) when benthic foraminiferal assemblages indicate that surface primary productivity was low, resulting in low intermediate-water Cdw at both sites. Then, from ∼ 5.2 to 2.4 cal ka, surface productivity increased markedly, causing a significant increase in the intermediate-water Cdw in the southeastern Arabian Sea and the northeastern BoB. The comparison of intermediate-water Cdw records with previous reconstructions of past Indian monsoon evolution during the Holocene suggests a direct control of intermediate-water Cdw by monsoon-induced changes in upper-water stratification and surface primary productivity.

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Untangling the effect of organic matter and dissolved oxygen on living benthic foraminifera in the southeastern Arabian Sea

Singh

Saraswat

Nigam

2021

Marine Pollution Bulletin

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Bottom foraminiferal assemblages in the Deryugin Basin (Sea of Okhotsk) during the past 26000 years

Cited by 4 publications

References 12 publications

Changes in productivity and intermediate circulation in the northern Indian Ocean since the last deglaciation: new insights from benthic foraminiferal Cd / Ca records and benthic assemblage analyses

Changes in productivity and intermediate circulation in the northern Indian Ocean since the last deglaciation: new insights from benthic foraminiferal Cd / Ca records and benthic assemblage analyses

Changes in productivity and intermediate circulation in the northern Indian Ocean since the last deglaciation: new insights from benthic foraminiferal Cd ∕ Ca records and benthic assemblage analyses

Untangling the effect of organic matter and dissolved oxygen on living benthic foraminifera in the southeastern Arabian Sea

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