18O modelling of freshwater inputs in Baffin Bay and Canadian Arctic coastal waters

Bédard, Pierre; Hillaire‐Marcel, Claude; Pagé, P.

doi:10.1038/293287a0

Cited by 56 publications

(25 citation statements)

References 10 publications

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“…During sea ice growth isotopically light brines are produced, that sub− sequently sink and mix with the more saline, subsurface water masses (e.g. Bédard et al 1981;Bauch et al 2004). Consequently, the winter−cooled bottom waters are usually not in phase with the regional d 18 O -salinity mixing lines.…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

Benthic foraminifera in Hornsund, Svalbard: Implications for paleoenvironmental reconstructions

Zajączkowski¹,

Szczuciński²,

Plessen³

et al. 2010

Polish Polar Research

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“…The distillation of sea-ice thus releases brines even slightly more depleted in heavy isotopes than the surface water mass itself due to the slight 18 O-enrichment of ice vs water which sink in the water column. When melting, sea-ice contributes to the low salinity of the surface water layer while enriching it with heavy isotopes [13,14]. These processes are illustrated in the figure below.…”

Section: Isotopic Imprint Of the Distillation Of Sea-water Through Sementioning

confidence: 99%

Foraminifera isotopic records… with special attention to high northern latitudes and the impact of sea-ice distillation processes

Hillaire‐Marcel¹

2011

IOP Conf. Ser.: Earth Environ. Sci.

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“…18 O values of 0% to -4% [39,49,50]. Also, the ice formation process fractionates isotopes only slightly, leaving the ice with +2% greater δ 18 O than the source seawater.…”

Section: O/ 16 O Isotope Ratiosmentioning

confidence: 98%

Mesoscale Distribution of Springtime Waters and Nutrients near the Continental Shelf Break, Beaufort Sea, Alaska~!2010-05-13~!2010-06-25~!2010-09-08~!

Christensen¹

2010

TOOCEAJ

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Forty two sites on the Alaskan Beaufort Sea shelf break were sampled by helicopter in April 2003 for hydrographic parameters and nutrients. Mesoscale maps delineated two eddies and the Beaufort shelf break current. Higher-salinity nutrient-rich waters upwelled onto the shelf, and the depth of the main pycnocline shoaled to <22 m. A plume of 31.40-31.80 salinity water at 10 m was flowing off the shelf, and maps of Brunt Vaisala frequencies and Richardson numbers showed that its presence weakened the pycnocline stability. The high shelf-break nutrient concentrations could support a spring-bloom productivity of 23 g-C m -2 y -1 , which, when added to previous summertime productivity measurements, demonstrated significant production along the Beaufort Sea shelf break.

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18O modelling of freshwater inputs in Baffin Bay and Canadian Arctic coastal waters

Cited by 56 publications

References 10 publications

Benthic foraminifera in Hornsund, Svalbard: Implications for paleoenvironmental reconstructions

Benthic foraminifera in Hornsund, Svalbard: Implications for paleoenvironmental reconstructions

Foraminifera isotopic records… with special attention to high northern latitudes and the impact of sea-ice distillation processes

Mesoscale Distribution of Springtime Waters and Nutrients near the Continental Shelf Break, Beaufort Sea, Alaska~!2010-05-13~!2010-06-25~!2010-09-08~!

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