Different nutrient sources forcing increased productivity during eastern Mediterranean S1 sapropel formation as reflected by calcareous dinoflagellate cysts
نویسندگان
چکیده
منابع مشابه
Late glacial initiation of Holocene eastern Mediterranean sapropel formation.
Recurrent deposition of organic-rich sediment layers (sapropels) in the eastern Mediterranean Sea is caused by complex interactions between climatic and biogeochemical processes. Disentangling these influences is therefore important for Mediterranean palaeo-studies in particular, and for understanding ocean feedback processes in general. Crucially, sapropels are diagnostic of anoxic deep-water ...
متن کاملOligotrophy and nitrogen fixation during eastern mediterranean sapropel events
Nitrogen isotopic measurements in fossil chlorophyll from late Pleistocene organic-rich sediments (sapropels) in the eastern Mediterranean Sea provide geochemical evidence for stratified, nutrient-depleted surface water and extensive nitrogen fixation. This evidence is reconciled with previous indications of high productivity by invoking a model of sapropel formation in which increased river di...
متن کامل14. Oxygen Isotope and Sapropel Stratigraphy in the Eastern Mediterranean
Stable oxygen isotope data from four holes drilled at the Ocean Drilling Program Site 967, which is located on the lower northern slope of the Eratosthenes Seamount, provide a continuous record of Eastern Mediterranean surface-water conditions during the last 3.2 Ma. A high-resolution stratigraphy for the Pliocene–Pleistocene sequence was established by using a combination of astronomical calib...
متن کاملBenthic foraminiferal record of ecosystem variability in the eastern Mediterranean Sea during times of sapropel S5 and S6 deposition
High-resolution benthic foraminiferal and geochemical investigations were carried out across sapropels S5 and S6 from two sediment cores in the Levantine Sea to evaluate the impact of climatic and environmental changes on benthic ecosystems during times of sapropel formation. The faunal successions indicate that eutrophication and/or oxygen reduction started several thousand years prior to the ...
متن کاملLong-term atmospheric nutrient inputs to the Eastern Mediterranean
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ژورنال
عنوان ژورنال: Paleoceanography
سال: 2004
ISSN: 0883-8305
DOI: 10.1029/2003pa000895