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Eemian and Holocene sea-surface conditions in the southern Black Sea: Organic-walled dinoflagellate cyst record from core 22-GC3

Urheber*innen

Shumilovskikh,  L. S.
External Organizations;

Marret,  F.
External Organizations;

Fleitmann,  D.
External Organizations;

Arz,  H. W.
External Organizations;

/persons/resource/nowa

Nowaczyk,  Norbert
5.2 Climate Dynamics and Landscape Evolution, 5.0 Earth Surface Processes, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Behling,  H.
External Organizations;

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Zitation

Shumilovskikh, L. S., Marret, F., Fleitmann, D., Arz, H. W., Nowaczyk, N., Behling, H. (2013): Eemian and Holocene sea-surface conditions in the southern Black Sea: Organic-walled dinoflagellate cyst record from core 22-GC3. - Marine Micropaleontology, 101, 146-160.
https://doi.org/10.1016/j.marmicro.2013.02.001


https://gfzpublic.gfz-potsdam.de/pubman/item/item_246553
Zusammenfassung
In order to compare the sea-surface conditions in the Black Sea during the Holocene and Eemian, sapropelic parts of marine core 22-GC3 (42°13.53'N/36°29.55'E, 838 m water depth) were studied for organic-walled dinoflagellate cyst content. The record shows a change from freshwater/brackish assemblages (Pyxidinopsis psilata, Spiniferites cruciformis, Caspidinium rugosum) to more marine assemblages (Lingulodinium machaerophorum, Spiniferites ramosus complex) during each interglacial, due to the inflow of saline Mediterranean water. The lacustrine – marine transitions in 22-GC3 occurred at ~ 8.3 cal kyrs BP during the early Holocene and ~ 128 kyrs BP during the early Eemian, slightly later compared to the onset of interglacial conditions on the adjacent land. Dinoflagellate cyst assemblages reveal higher sea-surface salinity (~ 28-30) (e.g. Spiniferites pachydermus, Bitectatodinium tepikiense, Spiniferites mirabilis) around ~ 126.5-121 kyrs BP in comparison to the Holocene (~ 15-20) as well as relatively high sea-surface temperature (e.g. Tuberculodinium vancampoae, Spiniferites pachydermus, Spiniferites mirabilis) especially at ~ 127.6-125.3 kyrs BP. Establishment of high sea-surface salinity during the Eemian correlates very well with reconstructed relatively high global sea-level and is explained as a combined effect of increased Mediterranean supply and high temperatures at the beginning of the last interglacial. The observed changes in the dinocyst record highlight the importance of nutrients for the composition of the Eemian and Holocene dinocyst assemblages.