Downcore Distribution of Living Calcareous Foraminifera and Stable Isotopes in the Western Barents Sea

Иванова, Е. В.; Ovsepyan, E. A.; Risebrobakken, Bjørg; Vetrov, A. A.

doi:10.2113/gsjfr.38.4.337

Cited by 34 publications

(44 citation statements)

References 58 publications

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“…2), the δ 18 O c record shows only minor variability (0.3 ‰). The amplitude difference between the measured δ 18 O c and reconstructed BWT TF indicates that a benthic foraminiferal fauna is not only affected by temperature and salinity but also nutrient availability exerts an influence via marked changes in the so-called "food indicator species" (e.g., N. labradorica, Islandiella spp., M. barleeanus; Hald and Korsun, 1997;Polyak et al, 2002;Lloyd, 2006;Ivanova et al, 2008). Thus, the large temperature variations in the BWT TF are most likely an overestimation due to the training set, and we must conclude that the training set and transfer functions used in the present study are not able to capture the small temperature variations as suggested by our δ 18 O c values.…”

Section: Mid-holocene (9800-1500 Yr Bp)mentioning

confidence: 76%

“…4). Both of these species are associated with high-productivity environments (Hald and Steinsund, 1996;Polyak et al, 2002), and N. labradorica is controlled more by food supply than by water temperature (Hald and Korsun, 1997;Lloyd, 2006;Ivanova et al, 2008). Further, the δ 18 O c values during the cold interval only show an increase of 0.15 ‰ (Fig.…”

Section: Early Holocene (11 500-9800 Yr Bp)mentioning

confidence: 95%

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Reconstruction of Atlantic water variability during the Holocene in the western Barents Sea

2014

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Abstract. The gravity core JM09-KA11-GC from 345 m water depth on the western Barents Sea margin was investigated for down-core distribution patterns of benthic Foraminifera, stable isotopes, and sedimentological parameters in order to reconstruct the flow of Atlantic water during the Holocene. The core site is located below the Atlantic water masses flowing into the Arctic Ocean and close to the Arctic front. The results show continuous presence of Atlantic water at the margin throughout the Holocene. During the early Holocene, (11 500-9800 cal yr BP), bottom water temperatures as calculated by transfer functions rose by 1.5 • C, likely due to the increased inflow of Atlantic water, although sea ice was still present at this time. The transition to the mid-Holocene is characterized by a local shift in current regime, resulting in a ceased supply of fine-grained material to the core location. Throughout the mid-Holocene the δ 18 O values indicate a slight cooling, thereby following changes in insolation. In the last 1500 yr, inflow of Atlantic water increased but was interrupted by periods of increased influence of Arctic water causing periodically colder and more unstable conditions.

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Section: Mid-holocene (9800-1500 Yr Bp)mentioning

confidence: 76%

Section: Early Holocene (11 500-9800 Yr Bp)mentioning

confidence: 95%

Reconstruction of Atlantic water variability during the Holocene in the western Barents Sea

2014

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“…It is supported by relatively abundant "living" C. lobatulus in the subsurface sediments, which is regarded as epifaunal (Nyholm 1961;Korsun et al 1994) and oxyphylic (Gooday 2003), however, in this study it appears to be more an infaunal species. Ivanova et al (2008) suggested that C. lobatulus can penetrate deep in to the sediment if it is detached from the hard substrate and transported down−core by bioturbation.…”

Section: Discussionmentioning

confidence: 99%

“…This approach implies that the available in the literature vital effects for particular species vary a lot (e.g. Grossman 1987 andIvanova et al 2008).…”

Section: Introductionmentioning

confidence: 99%

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Benthic foraminifera in Hornsund, Svalbard: Implications for paleoenvironmental reconstructions

Zajączkowski¹,

Szczuciński²,

Plessen³

et al. 2010

Polish Polar Research

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Modern hydrology of a typical Arctic fjord (Hornsund, SW Spitsbergen, Sval− bard) was investigated and compared with commonly used in paleoceanography proxies: benthic foraminiferal assemblages and their stable isotope (d 18 O and d 13 C) composition. The benthic foraminifera from Hornsund comprised 45 species and 28 genera. Their spatial variations follow the zonation pattern, resulting from the influence of Atlantic water at the fjord mouth and glacial meltwaters at the fjord head. At the mouth of the fjord, the total number of species and the contribution of agglutinating species were the highest. In the in− ner part of fjord, the foraminiferal faunas were poor in species and individuals, and aggluti− nating species were absent. "Living" (stained) foraminifera were found to be common throughout the short sediment cores (~10 cm long) studied. The stable isotope values of d 18 O and d 13 C were measured on tests of four species: Elphidium excavatum forma clavata, Cassidulina reniforme, Nonionellina labradorica and Cibicides lobatulus. The results con− firmed the importance of species−specific vital effects, particularly in the case of C. loba− tulus. The variability in the isotopic composition measured on different individuals within a single sample are comparable to isotopic composition of the same species test between sam− pling stations. The temperatures and bottom water salinities calculated from d18 O values in different foraminifera tests mirrored those recorded for bottom waters in the central and outer fjords relatively well. However, in the case of the inner fjord, where winter−cooled bottom waters were present, the calculated values from d 18 O were systematically higher by about 2°C. The obtained results imply that particular caution must be taken in interpretation of fjord benthic foraminifera assemblages in high resolution studies and in selection of ma− terial for isotope analyses and their interpretation in cores from inner fjords or silled fjords, where winter−cooled waters may be present.Key wo r d s: Arctic, Spitsbergen, benthic foraminifera, oxygen and carbon stable isotopes, paleotemperature, fjords.

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The Global Thermohaline Paleocirculation

Иванова¹

2009

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Downcore Distribution of Living Calcareous Foraminifera and Stable Isotopes in the Western Barents Sea

Cited by 34 publications

References 58 publications

Reconstruction of Atlantic water variability during the Holocene in the western Barents Sea

Reconstruction of Atlantic water variability during the Holocene in the western Barents Sea

Benthic foraminifera in Hornsund, Svalbard: Implications for paleoenvironmental reconstructions

The Global Thermohaline Paleocirculation

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