1,721,347 research outputs found
Total organic carbon on sediment core M72/5_628-1 (25-GC-1), Black Sea
No full textThe Marine Isotope Stage (MIS) 3 stands out due to its abrupt changes from cold and dry stadials to warm and humid interstadials, the so-called Dansgaard-Oeschger cycles that also affected temperature and rainfall in the Black Sea region. This study is based on a gravity core from the southeastern (SE) Black Sea that covers the last glacial lake stage from 64 to 20 ka BP. By using the composition of major and trace elements in the sediments, terrestrial plant-derived n-alkane flux, and Sr/Ca from benthic ostracods, we reconstruct the variability of riverine and aeolian input, salinity, and productivity in the SE Black Sea region in response to the Northern Hemisphere climate oscillations. During colder and drier stadials, the aeolian input increased relative to the riverine discharge, potentially due to southward shifted and/or stronger westerly winds and due to changes in the vegetation cover. An evaporation exceeding freshwater supply by rainfall and rivers possibly caused higher salinity and a lower lake level. The environmental status during MIS 4 and 2 is very much comparable with the stadial conditions during MIS 3. During warmer and more humid interstadials, lower salinity and presumably positive lake level changes most likely resulted from increased precipitation and river discharge. This likely increased primary productivity through an augmented nutrient supply. Lowest average salinities are suggested for the middle part of MIS 3 in response to enhanced meltwater from the disintegrating Fennoscandian Ice Sheet and/or by generally more humid conditions
Magnetization intensities of redeposited Black Sea sediment from the last glacial
No full textThis data publication provides data on redeposition experiments with mud collected during paleomagnetic sampling of various cores from the Arkhangelsky Ridge, SE Black Sea, recovered during marine expedition M72/5 of German research vessel RV METEOR in 2007 and expedition MSM33 of German research vessel RV Maria S. Merian in 2013. The collected silici-clastic mud mostly originates from glacial sediments deposited during marine isotope stages (MIS) 2 to 4, and 6. The material (bulk/mixed sample) originates from 208m to 847m water depth, 41° 28.66'N to 42° 13.57'N in latitude, and 36° 29.53'E to 37° 11.68'E in longitude. Experiments were performed in order to check the (non-) linearity of the detrital remanent magnetization (DRM) of Black Sea sediments acquired in different magnetic fields
Rockmagnetic parameters of sediment core PS1532-6
No full textRockmagnetic parameters of sediment core PS1532-
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