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| Titel |
Centennial scale variations of surface ocean in the Disko Bugt, west
Greenland |
| VerfasserIn |
Estelle Allan, Anne de Vernal, Maryse Henry, Mads Faurschou Knudsen, Matthias Moros, Marie-Michèle Ouellet-Bernier, Sofia Ribeiro |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250137783
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| Publikation (Nr.) |
 EGU/EGU2017-606.pdf |
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| Zusammenfassung |
| Palynological analyses of the sediment core MSM343310 from Disko Bugt document
decadal-centennial variations of surface waters during the last 3600 years. The dinocyst
assemblages dominated by Islandinium minutum, Brigantedinium spp., Islandinium?
cezare and the cyst of Pentapharsodinium dalei indicate large seasonal gradients of
temperature due to stratified surface waters. The high dinocysts concentrations (>105
cysts/cm3) and fluxes (>104 cysts/cm2year1) correspond to an extremely high
productivity. The application of the modern analogue technique to dinocyst assemblages
indicates centennial scale variation of sea-surface salinity in phase with fluctuation
of the ∂18O in the Camp Century ice core, thus highlighting the importance of
ocean/atmosphere exchanges on regional proxy-climate records. The seasonal sea ice cover
also records large amplitude variations, with a main change of regime at about 500
AD, from winter only sea ice of about 2 months/year to more unstable conditions
marked by successive cooling pulses with up to 8 months/year of ice coverage. |
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