Marine sediments from southeastern Brazilian continental shelf: A 1200year record of upwelling productivity

Souto, D. D.; Lessa, Douglas Villela de Oliveira; Albuquerque, Ana Luíza Spadano; Sifeddine, Abdelfettah; Turcq, Bruno; Barbosa, Cátia F

doi:10.1016/j.palaeo.2010.10.032

Cited by 35 publications

(29 citation statements)

References 46 publications

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“…The relative abundance of the eutrophic planktonic foraminiferal species Globigerina bulloides and Globigerinita glutinata in faunal assemblages was used as a proxy for marine productivity. The preference for nutrient‐enriched and highly productive environments represents the most important aspect particularly determining the distribution of these nonsymbiont‐bearing species (Oda & Yamasaki, ; Schiebel & Hemleben, ; Souto et al, ). Being primarily herbivorous, they proliferate when nutrients are introduced in the euphotic zone (e.g., upwelling regions), favoring primary production (e.g., phytoplankton blooms) (Metcalfe et al, ; Ortiz et al, ; Schiebel & Hemleben, ).…”

Section: Methodsmentioning

confidence: 99%

“…Being primarily herbivorous, they proliferate when nutrients are introduced in the euphotic zone (e.g., upwelling regions), favoring primary production (e.g., phytoplankton blooms) (Metcalfe et al, ; Ortiz et al, ; Schiebel & Hemleben, ). For this reason, both species are considered indicative of upwelling systems (Naidu et al, ; Peeters et al, ; Souto et al, ) and have been widely applied as proxies of marine productivity in paleoceanographic reconstructions (Lessa et al, ; Ortiz et al, ; Portilho‐Ramos et al, ).…”

Section: Methodsmentioning

confidence: 99%

“…It is also one of the regions where those nutrient‐enriched waters originated in the Southern Ocean emerge to the surface (Anderson et al, ). Nevertheless, especially in South Atlantic western boundary upwelling regions, where higher primary productivity occurs, paleoproductivity reconstructions are so far scarce or limited in temporal resolution and coverage (Lessa et al, ; Portilho‐Ramos et al, ; Souto et al, ). Therefore, the AMOC impact on marine productivity in the western South Atlantic still remains elusive.…”

Section: Introductionmentioning

confidence: 99%

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Productivity Evolution in the South Brazilian Bight During the Last 40,000 Years

Pereira

Arz

Pätzold

et al. 2018

Paleoceanog and Paleoclimatol

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Marine productivity largely controls the oceanic uptake of atmospheric carbon dioxide and contributed to the global climate changes that led to the termination of the last glacial cycle. Past changes in marine productivity were presumably associated with disturbances in the Atlantic meridional overturning circulation (AMOC). In the South Atlantic, however, the evolution of marine productivity throughout the last glacial–interglacial cycle is still poorly constrained mainly due to the scarcity of records with high temporal resolution. Here we present high‐resolution records of paleoproductivity and upper‐water‐column properties from the western subtropical South Atlantic covering the last 40,000 years. Our records are based on faunal and stable oxygen isotopic analyses of planktonic foraminifera from a marine sediment core collected from an upwelling region off southeastern South America (27°S). We used the relative abundance of eutrophic planktonic foraminifera (i.e., Globigerinita glutinata and Globigerina bulloides) as proxies of primary productivity. Our findings reveal, for the first time, enhanced primary productivity during Heinrich Stadials along the last glacial, when the AMOC showed reduced strength. Additionally, our results reveal decreased primary productivity over the Last Glacial Maximum, a period of markedly lower sea level; and the Younger Dryas, when the AMOC showed only moderate reductions. The most outstanding productivity decline, however, is depicted at the onset of the Holocene, when the AMOC recovers its strength. We hypothesize that the observed changes were triggered by the dynamics of the Brazil Current primarily driven by disturbances in the AMOC.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Productivity Evolution in the South Brazilian Bight During the Last 40,000 Years

Pereira

Arz

Pätzold

et al. 2018

Paleoceanog and Paleoclimatol

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“…The highest rates of sedimentation are found near Cabo Frio, due to the local influence of coastal upwelling responsible for the increased primary productivity, and further north of the study area (Mahiques et al, 2004(Mahiques et al, , 2005Nagai et al, 2009;Souto et al, 2011).…”

Section: Discussionmentioning

confidence: 95%

“…For example, Mahiques et al (2005) dated box cores collected off Cabo Frio and recorded ages of 100 years between depths of 6e8 cm, and sedimentation rates of 0.26 mm/y. Souto et al (2011) registered 0.23 mm/yr from 10 cm to the top at 117 m. In addition, a high degree of correlation in the sedimentation indices was recorded off Cabo Frio (transect A) and in the sectors in which lithogenic sediments of the Campos Basin are deposited, i.e., transect E (Mahiques et al, 2004(Mahiques et al, , 2005Nagai et al, 2009). This procedure was also adopted by Bubenshchikova et al (2008) for the analysis of the foraminifera at depths of up to 8 cm in the sediments of the waters off Okhotsk in the western Pacific Ocean.…”

Section: Discussionmentioning

confidence: 99%

Biofaciological zonation of benthic foraminifera of the continental shelf of Campos Basin, SE Brazil

Vieira

Koutsoukos

Machado

et al. 2015

Quaternary International

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Calcium carbonate dissolution triggered by high productivity during the last glacial-interglacial interval at the deep western South Atlantic

Suárez-Ibarra

Frozza

Petró

et al. 2021

Preprint

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Studies reconstructing surface paleoproductivity and benthic environmental conditions allow us to measure the effectiveness of the biological pump, an important mechanism in the global climate system. In order to assess surface productivity changes and their effect on the seafloor, we studied the sediment core SAT-048A, spanning 43-5 ka, recovered from the continental slope (1,542 m water depth) of the southernmost Brazilian continental margin, deep western South Atlantic. We assessed the sea surface productivity, the organic matter flux to the seafloor, and calcite dissolution effects, based on micropaleontological (benthic and planktonic foraminifers, ostracods), geochemical (benthic δ 13 C isotopes), and sedimentological data (carbonate and bulk sand content). Superimposed on the induced changes related to the last glacial-interglacial transition, the reconstruction indicates a significant and positive correlation between the paleoproductivity proxies and the summer insolation. From the reconstructed data, it was possible to identify high (low) surface productivity, high (low) organic matter flux to the seafloor, and high (low) dissolution rates of planktonic Foraminifera tests during the glacial (postglacial). Furthermore, within the glacial, enhanced productivity was associated with higher insolation values, explained by increased northeasterly summer winds that promoted meandering and upwelling of the nutrient-rich South Atlantic Central Water. Statistical analyses support the idea that productivity is the main cause for seafloor calcium carbonate dissolution, as opposed to changes in the Atlantic Meridional Overturning Circulation (at least for the 25-4 ka period). Further efforts must be invested in the comprehension and quantification of the total organic matter and biogenic carbonate burial during time intervals with an enhanced biological pump, aiming to better understand their individual roles.

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Marine sediments from southeastern Brazilian continental shelf: A 1200year record of upwelling productivity

Cited by 35 publications

References 46 publications

Productivity Evolution in the South Brazilian Bight During the Last 40,000 Years

Productivity Evolution in the South Brazilian Bight During the Last 40,000 Years

Biofaciological zonation of benthic foraminifera of the continental shelf of Campos Basin, SE Brazil

Calcium carbonate dissolution triggered by high productivity during the last glacial-interglacial interval at the deep western South Atlantic

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