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dc.contributor.authorBahr, Andre  Concept link
dc.contributor.authorLamy, Frank  Concept link
dc.contributor.authorArz, Helge W.  Concept link
dc.contributor.authorMajor, Candace O.  Concept link
dc.contributor.authorKwiecien, Olga  Concept link
dc.contributor.authorWefer, Gerold  Concept link
dc.date.accessioned2010-04-20T15:00:41Z
dc.date.available2010-04-20T15:00:41Z
dc.date.issued2008-01-12
dc.identifier.citationGeochemistry Geophysics Geosystems 9 (2008): Q01004en_US
dc.identifier.urihttps://hdl.handle.net/1912/3265
dc.descriptionAuthor Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 9 (2008): Q01004, doi:10.1029/2007GC001683.en_US
dc.description.abstractNew Mg/Ca, Sr/Ca, and published stable oxygen isotope and 87Sr/86Sr data obtained on ostracods from gravity cores located on the northwestern Black Sea slope were used to infer changes in the Black Sea hydrology and water chemistry for the period between 30 to 8 ka B.P. (calibrated radiocarbon years). The period prior to 16.5 ka B.P. was characterized by stable conditions in all records until a distinct drop in δ 18O values combined with a sharp increase in 87Sr/86Sr occurred between 16.5 and 14.8 ka B.P. This event is attributed to an increased runoff from the northern drainage area of the Black Sea between Heinrich Event 1 and the onset of the Bølling warm period. While the Mg/Ca and Sr/Ca records remained rather unaffected by this inflow; they show an abrupt rise with the onset of the Bølling/Allerød warm period. This rise was caused by calcite precipitation in the surface water, which led to a sudden increase of the Sr/Ca and Mg/Ca ratios of the Black Sea water. The stable oxygen isotopes also start to increase around 15 ka B.P., although in a more gradual manner, due to isotopically enriched meteoric precipitation. While Sr/Ca remains constant during the following interval of the Younger Dryas cold period, a decrease in the Mg/Ca ratio implies that the intermediate water masses of the Black Sea temporarily cooled by 1–2°C during the Younger Dryas. The 87Sr/86Sr values drop after the cessation of the water inflow at 15 ka B.P. to a lower level until the Younger Dryas, where they reach values similar to those observed during the Last Glacial Maximum. This might point to a potential outflow to the Mediterranean Sea via the Sea of Marmara during this period. The inflow of Mediterranean water started around 9.3 ka B.P., which is clearly detectable in the abruptly increasing Mg/Ca, Sr/Ca, and 87Sr/86Sr values. The accompanying increase in the δ 18O record is less pronounced and would fit to an inflow lasting ∼100 a.en_US
dc.description.sponsorshipThis research was funded by the DFG grants LA 1273/2-1, LA 1273/2, and WE 992/47-3. RCOM 0517.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2007GC001683
dc.subjectBlack Seaen_US
dc.subjectOstracodsen_US
dc.subjectTrace elementsen_US
dc.titleAbrupt changes of temperature and water chemistry in the late Pleistocene and early Holocene Black Seaen_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2007GC001683


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