de Vernal, Anne; Hillaire-Marcel, Claude; Turon, Jean-Louis; Matthiessen, Jens (2000): Dinocyst assemblages of site HM52-43 [dataset]. 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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Published: 2000 (exact date unknown) • DOI registered: 2005-03-18
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.
Project(s):
Coverage:
Latitude: 64.250000 * Longitude: 0.733333
Minimum DEPTH, sediment/rock: 0.68 m * Maximum DEPTH, sediment/rock: 0.82 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Nematosphaeropsis labyrinthus | N. labyrinthus | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 3 | Peridinium faeroense | P. faeroense | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 4 | Trinovantedinium capitatum | T. capitatum | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 5 | Algidasphaeridium minutum | A. minutum | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 6 | Brigantedinium spp. | Brigantedinium spp. | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 7 | Peridinoid type | Perid-T | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 8 | Polykrikos schwarzii | P. schwarzii | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 9 | Multispinula quanta | M. quanta | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 10 | Alexandrium excavatum | A. excavatum | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 11 | Bitectatodinium tepikiense | B. tepikiense | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 12 | Impagidinium aculeatum | I. aculeatum | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 13 | Impagidinium patulum | I. patulum | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 14 | Impagidinium paradoxum | I. paradoxum | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 15 | Impagidinium sphaericum | I. sphaericum | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 16 | Operculodinium centrocarpum | O. centrocarpum | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 17 | Operculodinium centrocarpum | O. centrocarpum | % | de Vernal, Anne | Counting, dinoflagellate cysts | sensu Wall & Dale 1966 |
| 18 | Spiniferites spp. | Spiniferites spp. | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 19 | Spiniferites bentori | S. bentori | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 20 | Spiniferites ramosus | S. ramosus | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 21 | Spiniferites elongatus | S. elongatus | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 22 | Spiniferites membranaceus | S. membranaceus | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 23 | Spiniferites mirabilis | S. mirabilis | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 24 | Lingulodinium machaerophorum | L. machaerophorum | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 25 | Pyxidinopsis reticulata | P. reticulata | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 26 | Ataxiodinium choane | A. choane | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 27 | Impagidinium pallidum | I. pallidum | % | de Vernal, Anne | Counting, dinoflagellate cysts | |
| 28 | Algidasphaeridium minutum var. cesare | A. minutum var. cesare | % | de Vernal, Anne | Counting, dinoflagellate cysts |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
216 data points