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de Vernal, Anne; Hillaire-Marcel, Claude; Turon, Jean-Louis; Matthiessen, Jens (2000): Dinocyst assemblages of site HM52-43. PANGAEA, https://doi.org/10.1594/PANGAEA.79362, Supplement to: de Vernal, A et al. (2000): Reconstruction of sea-surface temperature, salinity, and sea-ice cover in the northern North Atlantic during the last glacial maximum based on dinocyst assemblages. Canadian Journal of Earth Sciences, 37(5), 725-750, https://doi.org/10.1139/cjes-37-5-725

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Abstract:
Past sea-surface conditions over the northern North Atlantic during the last glacial maximum were examined from the study of 61 deep-sea cores. The last glacial maximum time slice studied here corresponds to an interval between Heinrich layers H2 and H1, and spanning about 20-16 ka on a 14C time scale. Transfer functions based on dinocyst assemblages were used to reconstruct sea-surface temperature, salinity, and sea-ice cover. The results illustrate extensive sea-ice cover along the eastern Canadian margins and sea-ice spreading, only during winter, over most of the northern North Atlantic. On the whole, much colder winter prevailed, despite relatively mild conditions in August (10-15°C at most offshore sites), thus suggesting a larger seasonal contrast of temperatures than today. Lower salinity than at present is reconstructed, especially along the eastern Canadian and Scandinavian margins, likely because of meltwater supply from the surrounding ice sheets. These reconstructions contrast with those established by CLIMAP on the basis of planktonic foraminifera. These differences are discussed with reference to the stratigraphical frame of the last glacial maximum, which was not the coldest phase of the last glacial stage. The respective significance of dinocyst and foraminifer records is also examined in terms of the thermohaline characteristics of surface waters and the vertical structure of upper water masses, which was apparently much more stratified than at present in the northern North Atlantic, thus preventing deep-water formation.
Coverage:
Latitude: 64.250000 * Longitude: 0.733333
Minimum DEPTH, sediment/rock: 0.68 m * Maximum DEPTH, sediment/rock: 0.82 m
Event(s):
HM52-43 (52-43) * Latitude: 64.250000 * Longitude: 0.733333 * Elevation: -2781.0 m * Location: northern North Atlantic * Method/Device: Gravity corer (GC)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmGeocode
2Nematosphaeropsis labyrinthusN. labyrinthus%de Vernal, AnneCounting, dinoflagellate cysts
3Peridinium faeroenseP. faeroense%de Vernal, AnneCounting, dinoflagellate cysts
4Trinovantedinium capitatumT. capitatum%de Vernal, AnneCounting, dinoflagellate cysts
5Algidasphaeridium minutumA. minutum%de Vernal, AnneCounting, dinoflagellate cysts
6Brigantedinium spp.Brigantedinium spp.%de Vernal, AnneCounting, dinoflagellate cysts
7Peridinoid typePerid-T%de Vernal, AnneCounting, dinoflagellate cysts
8Polykrikos schwarziiP. schwarzii%de Vernal, AnneCounting, dinoflagellate cysts
9Multispinula quantaM. quanta%de Vernal, AnneCounting, dinoflagellate cysts
10Alexandrium excavatumA. excavatum%de Vernal, AnneCounting, dinoflagellate cysts
11Bitectatodinium tepikienseB. tepikiense%de Vernal, AnneCounting, dinoflagellate cysts
12Impagidinium aculeatumI. aculeatum%de Vernal, AnneCounting, dinoflagellate cysts
13Impagidinium patulumI. patulum%de Vernal, AnneCounting, dinoflagellate cysts
14Impagidinium paradoxumI. paradoxum%de Vernal, AnneCounting, dinoflagellate cysts
15Impagidinium sphaericumI. sphaericum%de Vernal, AnneCounting, dinoflagellate cysts
16Operculodinium centrocarpumO. centrocarpum%de Vernal, AnneCounting, dinoflagellate cysts
17Operculodinium centrocarpumO. centrocarpum%de Vernal, AnneCounting, dinoflagellate cystssensu Wall & Dale 1966
18Spiniferites spp.Spiniferites spp.%de Vernal, AnneCounting, dinoflagellate cysts
19Spiniferites bentoriiS. bentorii%de Vernal, AnneCounting, dinoflagellate cysts
20Spiniferites ramosusS. ramosus%de Vernal, AnneCounting, dinoflagellate cysts
21Spiniferites elongatusS. elongatus%de Vernal, AnneCounting, dinoflagellate cysts
22Spiniferites membranaceusS. membranaceus%de Vernal, AnneCounting, dinoflagellate cysts
23Spiniferites mirabilisS. mirabilis%de Vernal, AnneCounting, dinoflagellate cysts
24Lingulodinium machaerophorumL. machaerophorum%de Vernal, AnneCounting, dinoflagellate cysts
25Pyxidinopsis reticulataP. reticulata%de Vernal, AnneCounting, dinoflagellate cysts
26Ataxiodinium choaneA. choane%de Vernal, AnneCounting, dinoflagellate cysts
27Impagidinium pallidumI. pallidum%de Vernal, AnneCounting, dinoflagellate cysts
28Algidasphaeridium minutum var. cesareA. minutum var. cesare%de Vernal, AnneCounting, dinoflagellate cysts
Size:
216 data points

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