Benthic foraminifera in the surface sediments of the Beaufort Shelf and slope, Beaufort Sea, Canada: Applications and implications for past sea-ice conditions

Scott, David B.; Schell, Trecia M.; Rochon, André; Blasco, Steve

doi:10.1016/j.jmarsys.2008.01.008

Cited by 37 publications

(38 citation statements)

References 30 publications

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“…Other characteristic calcareous species are Epistominella nipponica and Islandiella helenae with average abundances between 3 and 4 % (Appendix 1). The diversity indices are different from cluster 1 by a higher number of species (28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38). The diversity indices also increase to 13-24 for Fisher alpha and 2-3 for Table 2).…”

Section: Living Faunamentioning

confidence: 94%

“…A limited amount of studies of benthic foraminifera in surface sediments in the Arctic Ocean and adjoining seas have been carried out the last forty years: Lagoe [21], Schröder-Adams et al [37], Scott and Vilks [35], Bergsten [2], Hald and Steinsund [11], Ishman and Foley [15], Wollenburg and Mackensen [43], Osterman et al [25], Wollenburg and Kuhnt [44], Scott et al [36] and Saher et al [30,31]. Sediment samples investigated in these studies have been collected in different ways using grab samplers, gravity coring, box coring or multi coring.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally Wollenburg et al [45] and Cronin et al [5] used [63 lm size fraction. Staining of the living specimens has only been performed in some of the studies of modern benthic foraminifera: Schröder-Adams et al [37], Bergsten [2], Hald and Steinsund [11], Wollenburg and Mackensen [43], Wollenburg and Kuhnt [44], Scott et al [36] and Saher et al [30,31] Furthermore, only some of these studies have distinguished between stained (living) and not stained (dead) fauna assemblages counting at least 300 specimens from each group (e.g., Wollenburg and Mackensen [43], Wollenburg and Kuhnt [44]. The studies found that environmental parameters such as water depth, type of substrate and water mass characteristics are not the main factors ruling the distribution of modern benthic foraminifera.…”

Section: Introductionmentioning

confidence: 99%

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Recent benthic foraminifera in the Arctic Ocean and Kara Sea continental margin

Husum

Hald

Stein

et al. 2015

Arktos

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Section: Living Faunamentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recent benthic foraminifera in the Arctic Ocean and Kara Sea continental margin

Husum

Hald

Stein

et al. 2015

Arktos

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“…Highest sediment accumulation rates are found in the Mackenzie Trough and the nearby continental slope (Hill et al, 1991;Scott et al, 2008). The Mackenzie Shelf receives 249-333 km 3 of freshwater annually (Dittmar and Kattner, 2003), usually during the May-September period but reduced in winter near the coast, underneath the land fast ice .…”

Section: Study Areamentioning

confidence: 99%

Quantitative reconstruction of sea-surface conditions over the last 150 yr in the Beaufort Sea based on dinoflagellate cyst assemblages: the role of large-scale atmospheric circulation patterns

et al. 2012

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Abstract. Dinoflagellate cyst (dinocyst) assemblages have been widely used over the Arctic Ocean to reconstruct seasurface parameters on a quantitative basis. Such reconstructions provide insights into the role of anthropogenic vs natural forcings in the actual climatic trend. Here, we present the palynological analysis of a dated 36 cm-long core collected from the Mackenzie Trough in the Canadian Beaufort Sea. Dinocyst assemblages were used to quantitatively reconstruct the evolution of sea-surface conditions (temperature, salinity, sea ice) and freshwater palynomorphs fluxes were used as local paleo-river discharge indicators over the last ∼ 150 yr. Dinocyst assemblages are dominated by autotrophic taxa (68 to 96 %). Cyst of Pentapharsodinium dalei is the dominant species throughout most of the core, except at the top where the assemblages are dominated by Operculodinium centrocarpum. Quantitative reconstructions of sea-surface parameters display a series of relatively warm, lower sea ice and saline episodes in surface waters, alternately with relatively cool and low salinity episodes. Variations of dinocyst fluxes and reconstructed sea-surface conditions may be closely linked to large scale atmospheric circulation patterns such as the Pacific Decadal Oscillation (PDO) and to a lesser degree, the Arctic Oscillation (AO). Positive phases of the PDO correspond to increases of dinocyst fluxes, warmer and saltier surface waters, which we associate with upwelling events of warm and relatively saline water from Pacific origin. Freshwater palynomorph fluxes increased in three phases from AD 1857 until reaching maximum values in AD 1991, suggesting that the Mackenzie River discharge followed the same trend when its discharge peaked between AD 1989 and AD 1992. The PDO mode seems to dominate the climatic variations at multi-annual to decadal timescales in the western Canadian Arctic and Beaufort Sea areas.

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“…Iqbal [1973] explored the M'Clure Strait and found assemblages to be influenced by the proximity of the Arctic Ocean and occurred in numbers 10 times higher on the continental shelf than in M'Clure Strait proper. Calcareous foraminifera are abundant in deep‐sea, high‐salinity Arctic waters while agglutinated (noncalcareous species) are often dominant on the Arctic and subarctic shelf and shallow seas [ Lagoe , 1977; Vilks , 1989; Schröder‐Adams et al , 1990; Scott et al , 2006, 2008]. Scott and Vilks [1991] found a diverse assemblage of agglutinated species at depths of 800 to 1,000 m in surface samples near the Fram Strait which corresponded to a seasonally ice free area.…”

Section: Introductionmentioning

confidence: 99%

Paleo–sea ice conditions of the Amundsen Gulf, Canadian Arctic Archipelago: Implications from the foraminiferal record of the last 200 years

et al. 2008

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[1] Four boxcores were collected as part of the Canadian Arctic Exchange Shelf Study (CASES) in the Amundsen Gulf at water depths of 59 m to 600 m. Data from these cores help to develop a record of changes in the oceanographic history of the area over the last 200 years, with particular reference to the indication of paleo-sea ice formation, a key element of the Arctic ecosystem. The four sites cover a range of water depths and environments to provide a basis for comparison. The benthic foraminifera of sites CA-06 (253 m water depth) and CA-18 (600 m water depth) show an increase in Arctic Surface Water associated agglutinated foraminifera over the last $100 years (uppermost 8 to 16 cm). These are indicating a decrease in sea ice cover and in cold saline Arctic Bottom Water influence; these are similar to Canadian Arctic Archipelago postglacial faunas. This contrasts with abundant planktic foraminifera at the same stations, suggesting strong, oceanic Arctic surface influence (little freshwater) in the central Gulf. The foraminifera of sites 403B (59 m water depth) and 415B (56 m water depth), at the outermost edges of Amundsen Gulf, indicate that the present-day location of the winter flaw lead has been in place for at least the last 100 years, with foraminiferal faunas similar to those of the Beaufort Shelf. Additionally, station 415 is on an earlier Holocene shoreline that is covered with cobbles.

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Benthic foraminifera in the surface sediments of the Beaufort Shelf and slope, Beaufort Sea, Canada: Applications and implications for past sea-ice conditions

Cited by 37 publications

References 30 publications

Recent benthic foraminifera in the Arctic Ocean and Kara Sea continental margin

Recent benthic foraminifera in the Arctic Ocean and Kara Sea continental margin

Quantitative reconstruction of sea-surface conditions over the last 150 yr in the Beaufort Sea based on dinoflagellate cyst assemblages: the role of large-scale atmospheric circulation patterns

Paleo–sea ice conditions of the Amundsen Gulf, Canadian Arctic Archipelago: Implications from the foraminiferal record of the last 200 years

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