Modern Distribution of Benthic Foraminifera From Disko Bugt, West Greenland

Abstract

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

“…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.…”

“…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.…”

“…M. barleeanus is reported to feed on organic detritus, which can be delivered with fine sediments from shallow areas and then deposited in local depocenters (Polyak et al, 2002). Furthermore, the increase of N. labradorica from 11 500 to 10 600 yr BP also supports an increased inflow of Atlantic water since this species is linked to the higher nutrient content of Atlantic-derived waters and oceanic fronts (Hald and Korsun, 1997;Rytter et al, 2002;Jennings et al, 2004;Lloyd, 2006). The pulse of Islandiella spp.…”

Interaction between subsurface ocean waters and calving of the Jakobshavn Isbræ during the late Holocene

“…These groupings are based on the modern distribution of foraminifera in Disko Bugt (Lloyd, 2006a) and also other ecological studies from the Arctic (e.g. Vilks 1964Vilks , 1981Mudie et al 1984;Madsen & Knudsen 1994;Hald & Steinsund 1992;Jennings & Helgadottir 1994;Seidenkrantz, 1995;Hald & Korsun 1997;Korsun & Hald 1998 Disko Bugt has been shown to be linked to high levels of organic material, but this is also associated with strong influx of WGC waters (Lloyd, 2006a) hence their grouping in the Atlantic water group. The Polar Water group includes species commonly found in areas with no Atlantic water influence dominated by colder less saline waters and includes: Cuneata arctica, Spiroplectammina biformis (agglutinated taxa), Cassidulina reniforme and Elphidium excavatum f.…”

Century-scale relative sea-level changes in West Greenland — A plausibility study to assess contributions from the cryosphere and the ocean

“…However, this scatter is most likely an artefact of the decline of number of data points 398 with depth. Upper waters are generally warm (2-4 o C) due to solar heating, but the incursion of 399 Polar Water (Lloyd, 2006a)) at depths between 50m and 300m reduces the temperature between 400 these levels to between 0 and 2 o C. The warm, saline deep water body below 300-500m depth in 401 west Greenland is due to the northward movement of the West Greenland Current. 402…”