Seasonal associations of phytoplankton and planktic foraminifera in an upwelling region and their contribution to the seafloor

Sautter, L.; Sancetta, Constance

doi:10.1016/0377-8398(92)90043-j

Cited by 71 publications

(41 citation statements)

References 19 publications

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“…Only at the southwest margin of the latter are they <10%. These data, which are consistent with those collected from traps between [47][48][49][50][51][52][53][54] ∘ S near Tasmania [56], contrast with its 62% abundance in Trap 1 at Pukaki Rise (Figure 1). This is higher than its average in HB (49%).…”

Section: Taxa As Hydrographicsupporting

confidence: 87%

“…Kincaid et al [44] found that its abundance is correlated with phytoplankton blooms. Vertically stratified plankton tows in the Southern Ocean between [41][42][43][44][45][46][47][48][49][50][51][52][53] ∘ S [45] show its abundance covaries closely with fluorescence maxima, a biomass proxy, in near-surface water. Schiebel et al [46] found that its abundance is closely related to entrainment of nutrient-rich water.…”

Section: Taxa As Hydrographicmentioning

confidence: 99%

“…Pak and Kennett [50] showed that it calcifies near the thermocline. Reynolds and Thunell [51] and Sautter and Sancetta [52] noted that populations increased when near-surface water was weakly stratified. Its abundance at 1000 m at trap SCR in Bounty Trough [25] compares with those in nearby core-tops (∼20%-25%) but drops to 2% at 300 m. Unlike Globigerina bulloides, the taxon is most abundant about the STF where it may reflect fertility in the vicinity of the thermocline.…”

Section: Taxa As Hydrographicmentioning

confidence: 99%

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Planktonic Foraminifera as Oceanographic Proxies: Comparison of Biogeographic Classifications Using Some Southwest Pacific Core-Top Faunas

Scott

2013

ISRN Oceanography

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The distribution of planktonic foraminifera, as free-floating protists, is largely controlled by hydrography. Their death assemblages in surficial sediments provide proxy data on upper water mass properties for paleoceanography. Techniques for mapping faunal distributions for this purpose are compared in a study of 35 core-top samples that span the Subtropical Front in the Southwest Pacific. Faunas are analyzed by taxon composition, order of dominant taxa, and abundance. Taxon composition (presence-absence data) and dominant taxa (ordinal data) recognize groups of sites that approximate major water mass distributions (cool subtropical water, subantarctic water) and clearly define the location of the Subtropical Front. Quantitative data (relative abundances) more closely reflect the success of taxa in upper water mass niches. This information resolves groups of sites that reflect differences in intrawater mass hydrography. Comparisons suggest that abundance data should provide much better oceanographic resolution globally than the widely used ordinal biogeographic classification that identifies only Tropical, Subtropical Transitional, Subpolar and Polar provinces. As the data are strongly structured by variance in the abundance of Globigerina bulloides, Globorotalia inflata, Neogloboquadrina incompta, and Neogloboquadrina pachyderma, comparable classifications result from most clustering strategies. Principal coordinates analysis best represents the configuration of sites in two dimensions.

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Section: Taxa As Hydrographicsupporting

confidence: 87%

Section: Taxa As Hydrographicmentioning

confidence: 99%

Section: Taxa As Hydrographicmentioning

confidence: 99%

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Planktonic Foraminifera as Oceanographic Proxies: Comparison of Biogeographic Classifications Using Some Southwest Pacific Core-Top Faunas

Scott

2013

ISRN Oceanography

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“…Maximum production of Tr. quinqueloba, in particular, is associated with spring bloom conditions (Sautter and Sancetta, 1992). Proximity to the subarctic boundary is suggested by small but significant occurrences of cool subtropical taxa such as Globorotalia hirsuta, Globorotalia inflata, Globigerinoides ruber, and Globoturborotalita rubescens.…”

Section: Paleoenvironmentmentioning

confidence: 99%

“…The species has wide environmental tolerances, thrives in water masses from subtropical to subpolar regions, and reaches peaks of production during upwelling events (Sautter and Thunell, 1991;Sautter and Sancetta, 1992). The tests are also very susceptible to dissolution (Sautter and Thunell, 1989;1991), and their frequency may be sensitive to postdepositional processes.…”

Section: Paleoenvironmentmentioning

confidence: 99%

Planktonic Foraminiferal Biostratigraphy and Paleoceanography of Late Quaternary Turbidite Sequences at Holes 856A, 857A, and 857C, Leg 139

Brunner¹

1994

Proceedings of the Ocean Drilling Program, 139 Scientific Results

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Late Quaternary planktonic foraminiferal biostratigraphy and paleoceanography were examined at two sites from the east margin of Middle Valley of the northern Juan de Fuca Ridge. Calcareous microfossils are abundant and well preserved in the upper sequences where thermal and hydrothermal alteration is minimal and where deposition occurred after sites were tectonically raised above the turbidite plain of the axial valley. Approximately 200 samples were examined to determine depositional style and foraminiferal content including a census of planktonic foraminifers. Approximately 60% of the samples contain turbiditic material, so paleontologic interpretations must be made with caution.Ocean Drilling Program (ODP) Holes 856Aand 857 A contain abundant foraminifers above 52 and 85 mbsf, respectively. The fossiliferous sequences are divided into four informal coiling direction zones based on the species Neogloboquadrina pachyderma (Ehrenberg) and numbered from 1 to 4 from top to bottom of the sequences. Coiling direction zones 1 and 3 contain <90% sinistral forms and include the lower part of the present and penultimate interglacial periods and perhaps part of the glacial termination. Coiling direction zones 2 and 4 contain >90% sinistral forms and span most of the last two glacial periods. The bases of coiling direction zones 1 and 3 define two datum levels tentatively dated at 11,000 and 125,000 yr ago, respectively.Cluster analysis identified three assemblages: a subarctic assemblage, a transitional assemblage, and a subarctic dissolution assemblage. The subarctic dissolution assemblage occurs infrequently and sporadically throughout the unaltered glacial intervals in Holes 856A and 857A. In contrast, the dissolution assemblage dominates Hole 856A below 22 mbsf and is related to calcite precipitation driven by hydrothermal processes. The transitional assemblage appears in coiling direction zone 3 and records the close approach of the subpolar boundary to the ODP Leg 139 locale during the penultimate interglacial period. The subpolar boundary remained south of the study site at approximately 48°30'N latitude throughout the late Quaternary.

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Refined modeling and ¹⁴C plateau tuning reveal consistent patterns of glacial and deglacial ¹⁴C reservoir ages of surface waters in low‐latitude Atlantic

Balmer¹,

Sarnthein²,

Mudelsee

et al. 2016

Paleoceanography

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Modeling studies predict that changes in radiocarbon (14C) reservoir ages of surface waters during the last deglacial episode will reflect changes in both atmospheric 14C concentration and ocean circulation including the Atlantic Meridional Overturning Circulation. Tests of these models require the availability of accurate 14C reservoir ages in well‐dated late Quaternary time series. We here test two models using plateau‐tuned 14C time series in multiple well‐placed sediment core age‐depth sequences throughout the lower latitudes of the Atlantic Ocean. 14C age plateau tuning in glacial and deglacial sequences provides accurate calendar year ages that differ by as much as 500–2500 years from those based on assumed global reservoir ages around 400 years. This study demonstrates increases in local Atlantic surface reservoir ages of up to 1000 years during the Last Glacial Maximum, ages that reflect stronger trades off Benguela and summer winds off southern Brazil. By contrast, surface water reservoir ages remained close to zero in the Cariaco Basin in the southern Caribbean due to lagoon‐style isolation and persistently strong atmospheric CO2 exchange. Later, during the early deglacial (16 ka) reservoir ages decreased to a minimum of 170–420 14C years throughout the South Atlantic, likely in response to the rapid rise in atmospheric pCO2 and Antarctic temperatures occurring then. Changes in magnitude and geographic distribution of 14C reservoir ages of peak glacial and deglacial surface waters deviate from the results of Franke et al. (2008) but are generally consistent with those of the more advanced ocean circulation model of Butzin et al. (2012).

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Seasonal associations of phytoplankton and planktic foraminifera in an upwelling region and their contribution to the seafloor

Cited by 71 publications

References 19 publications

Planktonic Foraminifera as Oceanographic Proxies: Comparison of Biogeographic Classifications Using Some Southwest Pacific Core-Top Faunas

Planktonic Foraminifera as Oceanographic Proxies: Comparison of Biogeographic Classifications Using Some Southwest Pacific Core-Top Faunas

Planktonic Foraminiferal Biostratigraphy and Paleoceanography of Late Quaternary Turbidite Sequences at Holes 856A, 857A, and 857C, Leg 139

Refined modeling and ¹⁴C plateau tuning reveal consistent patterns of glacial and deglacial ¹⁴C reservoir ages of surface waters in low‐latitude Atlantic

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Seasonal associations of phytoplankton and planktic foraminifera in an upwelling region and their contribution to the seafloor

Cited by 71 publications

References 19 publications

Planktonic Foraminifera as Oceanographic Proxies: Comparison of Biogeographic Classifications Using Some Southwest Pacific Core-Top Faunas

Planktonic Foraminifera as Oceanographic Proxies: Comparison of Biogeographic Classifications Using Some Southwest Pacific Core-Top Faunas

Planktonic Foraminiferal Biostratigraphy and Paleoceanography of Late Quaternary Turbidite Sequences at Holes 856A, 857A, and 857C, Leg 139

Refined modeling and 14C plateau tuning reveal consistent patterns of glacial and deglacial 14C reservoir ages of surface waters in low‐latitude Atlantic

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Refined modeling and ¹⁴C plateau tuning reveal consistent patterns of glacial and deglacial ¹⁴C reservoir ages of surface waters in low‐latitude Atlantic