Citation:

2017PA003289

Name: Dinocyst assemblages in sediment core MSM05/3_343310 from Disko Bugt, West Greenland
Published: 2019-03-01
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Arctic climate change; Arctic sea ice reconstructions; Dinocyst database; Late Holocene; West Greenland

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Abstract:

Palynological analyses of sediment core MSM343310 from Disko Bugt (68°38.861' N, 53°49.493' W) document decadal‐ to centennial‐scale variability of sea surface conditions during the last ~3,600 years. Dinocyst fluxes (>10⁴ cysts/cm² yr⁻¹) indicate a very high productivity. Dinocyst assemblages dominated by Islandinium minutum, Brigantedinium spp., Islandinium? cezare, and the cyst of Pentapharsodinium dalei suggest low surface salinity and marked shifts in summer sea surface temperature. The application of the modern analog technique to dinocyst assemblages, using an updated reference data set with new sites from the West Greenland margin, led to reconstruct decadal‐centennial‐scale variations in sea surface salinity and temperature, in phase with the δ18O variations in the Camp Century ice core. At ~1.5 ka BP, the seasonal sea ice cover records an important regime change, from winter‐only sea ice to more unstable conditions marked by successive cooling pulses with sea ice cover of up to 8 months/yr. The data suggest a close relationship between hydrographic conditions and regional climate over Greenland. Our record shows variations with a mean 200 years periodicity until ~2 ka BP, which supports the hypothesis of climate variations driven by solar variability. After 1.5 ka BP, our data show a variability characterized by a 60-70 year periodicity, which suggests linkages with the Atlantic Multidecadal Oscillation and southwestward migration of the atmospheric polar front. The most recent part of the record, from ~1900 CE to 2007 CE, is characterized by assemblages reflecting warmer surface conditions and reduced sea ice cover.

Keyword(s):

Arctic climate change; Arctic sea ice reconstructions; Dinocyst database; Late Holocene; West Greenland

Related to:

Allan, Estelle; de Vernal, Anne; Knudsen, Mads Faurschou; Hillaire-Marcel, Claude; Moros, Matthias; Ribeiro, Sofia; Ouellet‐Bernier, Marie‐Michèle; Seidenkrantz, Marit-Solveig (2019): Dinocyst percentages in sediment core MSM05/3_343310 from Disko Bugt, West Greenland. PANGAEA, https://doi.org/10.1594/PANGAEA.898915

Allan, Estelle; de Vernal, Anne; Knudsen, Mads Faurschou; Hillaire-Marcel, Claude; Moros, Matthias; Ribeiro, Sofia; Ouellet‐Bernier, Marie‐Michèle; Seidenkrantz, Marit-Solveig (2019): Reconstructions of sea-surface parameters from sediment core MSM05/3_343310 from Disko Bugt, West Greenland. PANGAEA, https://doi.org/10.1594/PANGAEA.898918

Coverage:

Median Latitude: 68.647750 * Median Longitude: -53.824825 * South-bound Latitude: 68.647680 * West-bound Longitude: -53.824880 * North-bound Latitude: 68.647820 * East-bound Longitude: -53.824770

Minimum Elevation: -856.0 m * Maximum Elevation: -852.0 m

Event(s):

MSM05/3_343310-2-2 * Latitude: 68.647820 * Longitude: -53.824770 * Elevation: -852.0 m * Location: Baffin Bay * Campaign: * Basis: * Method/Device: MultiCorer (MUC)

MSM05/3_343310-5-1 * Latitude: 68.647680 * Longitude: -53.824880 * Elevation: -856.0 m * Location: Baffin Bay * Campaign: * Basis: * Method/Device: Gravity corer (GC)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Allan, Estelle
2	Age	Age	a AD/CE	Allan, Estelle
3	AGE	Age	ka BP	Allan, Estelle		Geocode
4	Achomosphaera spp.	Achomosphaera spp.	#	Allan, Estelle	Counting, palynology
5	Bitectatodinium tepikiense	B. tepikiense	#	Allan, Estelle	Counting, palynology
6	Impagidinium aculeatum	I. aculeatum	#	Allan, Estelle	Counting, palynology
7	Impagidinium pallidum	I. pallidum	#	Allan, Estelle	Counting, palynology
8	Nematosphaeropsis labyrinthus	N. labyrinthus	#	Allan, Estelle	Counting, palynology
9	Operculodinium centrocarpum	O. centrocarpum	#	Allan, Estelle	Counting, palynology
10	Spiniferites elongatus	S. elongatus	#	Allan, Estelle	Counting, palynology
11	Spiniferites ramosus	S. ramosus	#	Allan, Estelle	Counting, palynology
12	Spiniferites belerius	S. belerius	#	Allan, Estelle	Counting, palynology
13	Spiniferites bentori	S. bentori	#	Allan, Estelle	Counting, palynology
14	Spiniferites spp.	Spiniferites spp.	#	Allan, Estelle	Counting, palynology
15	Pentapharsodinium dalei cyst	P. dalei cyst	#	Allan, Estelle	Counting, palynology
16	Islandinium minutum	I. minutum	#	Allan, Estelle	Counting, palynology	*
17	Islandinium? cezare	I.? cezare	#	Allan, Estelle	Counting, palynology	*
18	Islandinium brevispinosum	I. brevispinosum	#	Allan, Estelle	Counting, palynology	*
19	Brigantedinium spp.	Brigantedinium spp.	#	Allan, Estelle	Counting, palynology	*
20	Dubridinium spp.	Dubridinium spp.	#	Allan, Estelle	Counting, palynology	*
21	Lejeunecysta spp.	Lejeunecysta spp.	#	Allan, Estelle	Counting, palynology	*
22	Selenopemphix quanta	S. quanta	#	Allan, Estelle	Counting, palynology	*
23	Protoperidinium nudum cyst	P. nudum cyst	#	Allan, Estelle	Counting, palynology	*
24	Votadinium calvum	V. calvum	#	Allan, Estelle	Counting, palynology	*
25	Protoperidinium americanum	P. americanum	#	Allan, Estelle	Counting, palynology	*
26	Echinidinium spp.	Echinidinium spp.	#	Allan, Estelle	Counting, palynology	*

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

5064 data points

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