Morphometric analysis in the shells of the planktonic foraminifera Orbulina universa: a source for paleoceanographic information?

Duque-Castaño, Mónica Liliana; Leonhardt, Adriana; Pivel, M A

doi:10.1590/s1679-87592019025206701

Cited by 6 publications

(3 citation statements)

References 56 publications

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“…According to paleoproductivity proxies measured in the core SIS188 (Figure 4), the paleoproductivity was high during MIS 1, especially during the Holocene (Gonçalves and Leonhardt, 2021a). Since the upwelling system seems to be weakened during this interval (Chiessi et al, 2015;Pereira et al, 2018;Duque-Castaño et al, 2019;Gonçalves and Leonhardt, (2021b)), this higher productivity could be the result of geochemical dynamics caused by marine regression during the LGM (Gonçalves and Leonhardt, (2021b)). Filippelli et al (2007) demonstrated that the redistribution of phosphorus from the continental margin to the deep ocean during marine regressions can show a lag of 10-20 kyr between the phosphorus-based export production records and the sea level change, causing the maximum increase in productivity to be noticed only during deglaciation.…”

Section: Mis 1 (14 -74 Cal Ka Bp; 59 -22 Cm)mentioning

confidence: 97%

“…As control points, four AMS 14 C ages were obtained (Table 1). The age model was constructed using the AnalySeries software (Paillard et al, 1996) and was presented by Duque-Castaño et al (2019) and Gonçalves and Leonhardt (2021a). Dating of 14 C was performed on the planktonic foraminifera Globigerinoides ruber (fraction > 150 μm; 10 mg per sample) using accelerated mass spectrometry (AMS) at the Laboratório de Radiocarbono of the Universidade Federal Fluminense (LAC-UFF).…”

Section: Age Modelmentioning

confidence: 99%

“…Radiocarbon ages used in the construction of the marine core SIS188 age model(Duque-Castaño et al (2019);Gonçalves and Leonhardt (2021a).…”

mentioning

confidence: 99%

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Continental influence on the fertilization of marine waters during the late quaternary in the south of the Brazilian continental margin

et al. 2022

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This study sought to understand the role of continental influence on ocean productivity along the late Quaternary based on the comparison between continental palynomorphs and paleoproductivity proxies from the marine sediment core SIS188. Retrieved from the slope of the Pelotas Basin at a depth of 1,514 m, the core documents the time interval between 47.8 and 7.4 cal ka BP, including the Marine Isotope Stages (MIS) 3, 2 and 1. The palynological content found in the core SIS188 indicates a typical flora of the southern Brazil highlands, which is at the same latitude as the core. Thus, continental input sources, such as wind-borne dust and discharges from the Mampituba and Araranguá rivers, would more likely account for the palynological content than the Brazilian Coastal Current (BCC). During the glacial intervals (MIS 3 and MIS 2), paleoproductivity (indicated by the proxies coccolith numbers, N Ratio, and TOC content) suggest the intensification of upwelling and transport of wind dust, the latter of which may have transported pollen grains to the core region. There is a concentration decrease of continental palynomorphs at the end of MIS 2, which is accentuated during MIS 1 when the sea level is higher. Paleoproductivity was high during MIS 1, especially from the Holocene onwards, although the concentration of continental-derived palynomorphs decreases sharply, showing that the rise in sea level interferes with the fertilization of marine waters far from the coast by continental input.

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