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Hansen, Katrine Elnegaard; Giraudeau, Jacques; Wacker, Lukas; Pearce, Christof; Seidenkrantz, Marit-Solveig (2020): Benthic foraminiferal abundances from eastern Baffin Bay, sediment core AMD14-204C [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.920240

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Abstract:
Baffin Bay is a semi-enclosed basin connecting the Arctic Ocean and the western North Atlantic, thus making out a significant pathway for heat exchange. Here we reconstruct the alternating advection of relatively warmer and saline Atlantic waters versus the incursion of colder Arctic water masses entering Baffin Bay through the multiple gateways in the Canadian Arctic Archipelago and the Nares Strait during the Holocene. We carried out benthic foraminiferal assemblage analyses, X-ray fluorescence scanning, and radiocarbon dating of a 738 cm long marine sediment core retrieved from eastern Baffin Bay near Upernavik, Greenland (Core AMD14-204C; 987m water depth). Results reveal that eastern Baffin Bay was subjected to several oceanographic changes during the last 9.2 kyrCE1. Waning deglacial conditions with enhanced meltwater influxes and an extensive sea-ice cover prevailed in eastern Baffin Bay from 9.2 to 7.9 ka. A transition towards bottom water amelioration is recorded at 7.9 ka by increased advection of Atlantic water masses, encompassing the Holocene Thermal Maximum. A cold period with growing sea-ice cover at 6.7 ka interrupts the overall warm subsurface water conditions, promoted by a weaker northward flow of Atlantic waters. The onset of the neoglaciation at ca. 2.9 ka is marked by an abrupt transition towards a benthic fauna dominated by agglutinated species, likely in part explained by a reduction of the influx of Atlantic Water, allowing an increased influx of the cold, corrosive Baffin Bay Deep Water originating from the Arctic Ocean to enter Baffin Bay through the Nares Strait. These cold subsurface water conditions persisted throughout the Late Holocene, only interrupted by short-lived warmings superimposed on this cooling trend.
Keyword(s):
AMD14-204C; Baffin Bay; Benthic foraminifera; Holocene
Supplement to:
Hansen, Katrine Elnegaard; Giraudeau, Jacques; Wacker, Lukas; Pearce, Christof; Seidenkrantz, Marit-Solveig (2020): Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay. Climate of the Past, 16(3), 1075-1095, https://doi.org/10.5194/cp-16-1075-2020
Coverage:
Latitude: 73.261050 * Longitude: -57.899780
Date/Time Start: 2014-07-28T00:00:00 * Date/Time End: 2014-07-28T00:00:00
Minimum DEPTH, sediment/rock: 0.045 m * Maximum DEPTH, sediment/rock: 7.375 m
Event(s):
AMD14-204_CASQ * Latitude: 73.261050 * Longitude: -57.899780 * Date/Time: 2014-07-28T00:00:00 * Elevation: -987.0 m * Recovery: 7.34 m * Campaign: AMD14_1b (ArcticNet) * Basis: CCGS Amundsen * Method/Device: Calypso square corer (CASQ)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepth sedmHansen, Katrine ElnegaardGeocode – midpoint
2AGEAgeka BPHansen, Katrine ElnegaardGeocode
3Cassidulina neoteretisC. neoteretis%Hansen, Katrine Elnegaard
4Islandiella norcrossiI. norcrossi%Hansen, Katrine Elnegaard
5Cassidulina reniformeC. reniforme%Hansen, Katrine Elnegaard
6Bolivina pseudopunctataB. pseudopunctata%Hansen, Katrine Elnegaard
7Stainforthia feylingiS. feylingi%Hansen, Katrine Elnegaard
8Astrononion gallowayiA. gallowayi%Hansen, Katrine Elnegaard
9Buliminella elegantissimaB. elegantissima%Hansen, Katrine Elnegaard
10Elphidium clavatumE. clavatum%Hansen, Katrine Elnegaard
11Epistominella arcticaE. arctica%Hansen, Katrine Elnegaard
12Epistominella vitreaE. vitrea%Hansen, Katrine Elnegaard
13Nonionellina labradoricaN. labradorica%Hansen, Katrine Elnegaard
14RatioRatioHansen, Katrine Elnegaardagglutinated/calcareous
15Foraminifera, benthicForam benth#/gHansen, Katrine Elnegaard
16Foraminifera, plankticForam plankt#/gHansen, Katrine Elnegaard
17Portatrochammina bipolarisP. bipolaris%Hansen, Katrine Elnegaard
18Psammosphaera fuscaP. fusca%Hansen, Katrine Elnegaard
19Recurvoides trochamminiformisR. trochamminiformis%Hansen, Katrine Elnegaard
20Reophax subfusiformisR. subfusiformis%Hansen, Katrine Elnegaard
21Textularia kattegatensisT. kattegatensis%Hansen, Katrine ElnegaardTextularia kattegatensis
22Textularia torquataT. torquata%Hansen, Katrine Elnegaard
23Textularia earlandiT. earlandi%Hansen, Katrine Elnegaard
24Foraminifera, benthic calcareousForam benth calc#/gHansen, Katrine Elnegaard
25Foraminifera, benthic agglutinatedForam benth agg#/gHansen, Katrine Elnegaard
26Foraminifera, benthic atlantic speciesForam benth atlan%Hansen, Katrine Elnegaardwith aggl.
27Foraminifera, benthic atlantic speciesForam benth atlan%Hansen, Katrine Elnegaardwithout aggl.
28Foraminifera, sea ice speciesForam sea ice%Hansen, Katrine Elnegaardwith aggl.
29Foraminifera, sea ice speciesForam sea ice%Hansen, Katrine Elnegaardwithout aggl.
Size:
2106 data points

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