ausblenden:
Schlagwörter:
Black Sea; paleoclimate; paleohydrology; late glacial; Holocene; Caspian Sea
DDC:
550 - Earth sciences
Zusammenfassung:
Gravity cores from the continental slope in the northwestern Black Sea were studied using high-resolution stable isotope, grain size and XRF-scanning data. The measurements provide a 30000 years AMS 14C-dated record of variations in the hydrological regime of the Black Sea and give insight into changing paleoenvironments in the surrounding areas. Stable climatic conditions during the Last Glacial Maximum were followed by a series of meltwater pulses most likely originating from the Scandinavian ice sheet between 18000 and 15500 yr BP.1 This meltwater input rose the level of the Caspian Sea to a point that Caspian water could spill into the Black Sea via the Manych-depression north of the Caucasian mountains. Highfrequency oscillations in the XRF-data during this period suggest a probable link to the arctic climate regime. Later, during the Bblling/Allerbd and the early Holocene, prevailing high temperatures led to authigenic calcite precipitation through increased phytoplankton activity, interrupted by the Younger Dryas and the b8200 yr BP cold eventQ with dominant clastic sedimentation.
