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Lochte, Annalena Antonia; Schneider, Ralph R (2022): Benthic foraminiferal assemblages from sediment core MSM45/19_2 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.945744

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Abstract:
The presented data originates from the 1306cm long gravity core MSM45-19-2 (58°45.68 N, 61°56.25 W, 202m water depth) taken during R/V Maria S. Merian cruise MSM45 in August 2015 at 202 m water depth on the northern Labrador Shelf, northeast Canada, northwest Atlantic. In order to fully understand the dynamics that contributed to the establishment of modern Labrador Sea circulation, detailed reconstructions of the major paleoceanographic changes through the Holocene are critical. Therefore, this study aims to provide new information on bottom (i.e. subsurface) water mass composition as well as on changes in primary productivity and sea-ice conditions in the LC during the Holocene. Reconstructions are based on benthic foraminiferal assemblages.
Foraminiferal assemblages were counted in 15–20 and 50-cm intervals between 0–200 and 200–1300 cm core depth, respectively. Sample resolution in the upper core section was increased because of lower sedimentation rates. Each sample contained about 20 mL of wet sediment that was extracted using two syringes of 1.5 cm diameter. Samples were wet sieved through mesh sizes of 1000, 100, and 63 μm and dried. When necessary because of large sample size, the dried samples were subsequently split using a splitter. Foraminifera of the 100–1000 μm fraction were analyzed on a picking tray (following Seidenkrantz et al., 2007). At least 300 specimens were counted in each sample to obtain statistically sound numbers. Species abundances are expressed as percentages of the entire fauna. Foraminiferal concentrations, which is the number of specimens found in 1 mL of wet sediment, were calculated for all samples except for eight samples in the upper core section that were added later to increase the sample resolution. Since the wet volume of the additional samples could not be sufficiently quantified, we could not calculate foraminiferal concentrations for these samples.
Only benthic foraminifera are present throughout the core. A total of 33 species were identified comprising 13 agglutinated and 20 calcareous taxa (Figure 3; Appendix 1). The main taxa are E. clavatum, I. helenae, C. reniforme, B. frigida, and N. labradorica, and the most common accessory species are E. albiumbilicatum, E. takayanagii, S. feylingi, and C. lobatulus.
We differentiated four distinct climatic periods in the western Labrador Sea. From 8.9 to 8.6 ka BP, the Labrador Shelf was dominated by polar water outflow from Baffin Bay and covered by perennial sea ice. Between 8.6 and 7.4 ka BP, a strong subsurface inflow of warmer Atlantic water masses is ascribed to an intensification and redirection of the West Greenland Current. At 7.4 ka BP, the decreased influence of Atlantic water masses on the Labrador Shelf marks the establishment of winter convection leading to the formation of Labrador Sea Water in the central basin. Concurrently, an intensified polar water outflow through the Canadian Gateways strengthened the inner Labrador Current, and higher primary productivity suggests longer spring blooms because of a shorter sea-ice season during the Holocene Thermal Maximum. In the late Holocene after 3 ka BP, periodic fluctuations of primary productivity may tentatively be correlated with stronger and weaker northwesterly winds
Keyword(s):
Benthic foraminifera assemblages; Holocene; Labrador Sea
Related to:
Further details:
Seidenkrantz, Marit-Solveig; Aagaard-Sørensen, Steffen; Sulsbrück, H; Kuijpers, Antoon; Jensen, Sven; Kunzendorf, Helmar (2007): Hydrography and climate of the last 4400 years in a SW Greenland fjord: implications for Labrador Sea palaeoceanography. The Holocene, 17(3), 387-401, https://doi.org/10.1177/0959683607075840
Funding:
GEOMAR - Helmholtz Centre for Ocean Research Kiel (GEOMAR), grant/award no. VH-KO-601: Helmholtz Research School on Ocean System Science and Technology
Coverage:
Latitude: 58.761330 * Longitude: -61.937500
Date/Time Start: 2015-08-10T18:20:00 * Date/Time End: 2015-08-10T18:20:00
Minimum DEPTH, sediment/rock: 0.03 m * Maximum DEPTH, sediment/rock: 13.03 m
Event(s):
MSM45_418-2 (MSM45-19-2) * Latitude: 58.761330 * Longitude: -61.937500 * Date/Time: 2015-08-10T18:20:00 * Elevation: -201.8 m * Location: Labrador Sea * Campaign: MSM45 * Basis: Maria S. Merian * Method/Device: Gravity corer (GC)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
DEPTH, sediment/rockDepth sedmLochte, Annalena AntoniaGeocode
AGEAgeka BPLochte, Annalena AntoniaGeocode
Sample volumeSamp volmlLochte, Annalena Antoniawet
Number of speciesSpec No#Lochte, Annalena AntoniaCounting 100-1000 µm fraction
Foraminifera, benthicForam benth#/gLochte, Annalena AntoniaCounting 100-1000 µm fraction
Adercotryma glomeratumA. glomeratum%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
Ammodiscus sp.Ammodiscus sp.%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
Ammotium cassisA. cassis%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
Astrononion gallowayiA. gallowayi%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
10 Buccella frigidaB. frigida%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
11 Buccella tenerrimaB. tenerrima%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
12 Cassidulina laevigataC. laevigata%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
13 Cassidulina reniformeC. reniforme%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
14 Cibicides lobatulusC. lobatulus%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
15 Cribrostomoides crassimargoC. crassimargo%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
16 Cribrostomoides subglobosumC. subglobosum%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
17 Elphidium albiumbilicatumE. albiumbilicatum%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
18 Elphidium clavatumE. clavatum%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
19 Epistominella takayanagiiE. takayanagii%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
20 Epistominella vitreaE. vitrea%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
21 Fissurina sp.Fissurina sp.%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
22 Haynesina orbicularisH. orbicularis%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
23 Islandiella helenaeI. helenae%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
24 Islandiella norcrossiI. norcrossi%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
25 Nonionella digitataN. digitata%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
26 Nonionellina labradoricaN. labradorica%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
27 Procerolagena gracillimaP. gracillima%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
28 Quinqueloculina seminulumQ. seminulum%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
29 Recurvoides turbinatusR. turbinatus%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
30 Reophax fusiformisR. fusiformis%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
31 Reophax subfusiformisR. subfusiformis%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
32 Reophax turboR. turbo%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
33 Silicosigmoilina groenlandicaS. groenlandica%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
34 Spiroplectammina biformisS. biformis%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
35 Stainforthia feylingiS. feylingi%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
36 Textularia agglutinansT. agglutinans%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
37 Trifarina angulosaT. angulosa%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
38 Turritellella sp.Turritellella sp.%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
39 Verneuilina arcticaV. arctica%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
40 Foraminifera, benthic indeterminataForam benth indet%Lochte, Annalena AntoniaCounting 100-1000 µm fraction
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1328 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Depth sed [m]

Age [ka BP]

Samp vol [ml]

Spec No [#]

Foram benth [#/g]

A. glomeratum [%]

Ammodiscus sp. [%]

A. cassis [%]

A. gallowayi [%]
10 
B. frigida [%]
11 
B. tenerrima [%]
12 
C. laevigata [%]
13 
C. reniforme [%]
14 
C. lobatulus [%]
15 
C. crassimargo [%]
16 
C. subglobosum [%]
17 
E. albiumbilicatum [%]
18 
E. clavatum [%]
19 
E. takayanagii [%]
20 
E. vitrea [%]
21 
Fissurina sp. [%]
22 
H. orbicularis [%]
23 
I. helenae [%]
24 
I. norcrossi [%]
25 
N. digitata [%]
26 
N. labradorica [%]
27 
P. gracillima [%]
28 
Q. seminulum [%]
29 
R. turbinatus [%]
30 
R. fusiformis [%]
31 
R. subfusiformis [%]
32 
R. turbo [%]
33 
S. groenlandica [%]
34 
S. biformis [%]
35 
S. feylingi [%]
36 
T. agglutinans [%]
37 
T. angulosa [%]
38 
Turritellella sp. [%]
39 
V. arctica [%]
40 
Foram benth indet [%]
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4.536.88950000020.5795.610.000.00.000.0014.690.000.007.760.000.000.00.0048.980.000.000.001.6314.290.000.008.160.000.000.000.000.000.000.000.002.450.00.000.000.002.04
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9.037.92600000021.01071.050.000.00.000.005.360.000.0037.272.140.000.04.0227.080.270.000.540.0018.500.000.001.610.000.000.000.000.000.000.000.002.410.00.000.000.000.80
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10.538.54281818221.57153.670.000.00.000.000.000.000.0040.440.000.000.00.0044.550.240.000.480.0010.900.000.000.480.000.000.000.000.000.000.000.000.480.00.000.000.002.42
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