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Extreme change in sulfide concentrations in the Black Sea during the Little Ice Age reconstructed using molybdenum isotopes


, : Extreme change in sulfide concentrations in the Black Sea during the Little Ice Age reconstructed using molybdenum isotopes. Geology 40(7): 595-598

The Black Sea is the largest and most studied anoxic basin in the modern world. Much of this research has focused on the redox structure of the water column, specifically on the driving forces behind variations in the position, stability, and structure of the oxic-anoxic interface (chemocline). However, none of these studies has been able to quantify the historical sulfide concentrations associated with the changes in chemocline depth. Using the isotopic composition of molybdenum in sediments as a proxy, we show for the first time that varying concentrations of dissolved sulfide can be fingerprinted in historical systems. Our molybdenum isotope data indicate that in the region of the Bosporus inlet, the chemocline rose more than 65 m, reaching concentrations over 1 μM sulfide in the bottom water ca. 3 yr B.P. This historical shoaling of the chemocline and extreme change in bottom-water sulfide concentration exceeds the modern changes that have been observed directly and attributed to anthropogenic influences on the Black Sea chemistry/hydrology. The first cold interval of the Little Ice Age, when temperature and circulation changes occurred in the Black Sea basins, may have provided the natural trigger for this extreme rise in bottom-water sulfide concentrations.

US$19.90

DOI: 10.1130/G32932.1


Other references

Sisk, T.D.; Imhoff, M.L.; Milne, A., 1995: Remotely sensed indicators of habitat heterogeneity and effect on biological diversity. Bulletin of the Ecological Society of America 76(3 SUPPL ): 389

Trimble Stanley W., 1983: Sediment in Tennessee streams as analyzed from reservoir surveys. Reservoir survey data, primarily from the Tennessee Valley Authority, were used to estimate sediment yields and concentrations in Tennessee streams and reservoirs. The Churchill routing method was used with sediment "cascaded" through th...

Payne, K.; Kozma, C.M.; Lawrence, B.J., 1996: Comparing dihydroergotamine mesylate and sumatriptan in the management of acute migraine. A retrospective cost-efficacy analysis. The annual cost of managing migraine totals billions of US dollars. This retrospective economic analysis of a clinical trial comparing subcutaneous dihydroergotamine mesylate (DHE) with subcutaneous sumatriptan in the treatment of acute migraine i...

Buchholtz, K.P., 1963: How to beat the quack-grass problem. Brief recommendations are given for the use of atrazine and dalapon to control Agropyron repens in maize-growing areas. Maize sown at approximately 200, 000 plants/ac in plots with adequate soil moisture and fertility, treated pre-sowing in autumn...

Seigfried, B.D.; Marcon, P.C.R.G.; Witkowski, J.F.; Wright, R.J.; Warren, G.W., 1995: Susceptibility of field populations of the European corn borer, Ostrinia nubilalis , to Bacillus thuringiensis. Susceptibility to the CryIA(b) protein from Bacillus thuringiensis (Berliner) was determined for five field-collected populations and one laboratory colony of the European corn borer, Ostrinia nubilalis (Hubner). Field-collected larvae were reared...

Takyar, S.; Zhang, Y.; Haslip, M.; Jin, L.; Shan, P.; Zhang, X.; Lee, P.J., 2016: An endothelial TLR4-VEGFR2 pathway mediates lung protection against oxidant-induced injury. TLR4 deficiency causes hypersusceptibility to oxidant-induced injury. We investigated the role of TLR4 in lung protection, using used bone marrow chimeras; cell-specific transgenic modeling; and lentiviral delivery in vivo to knock down or express...

Culioli, J.B.n, J.; Maubois, J., 1974: Study of the viscosity of retents and pre-cheeses obtained after treatment of milk by membrane ultrafiltration. Lait 54 (538) 481-500

Kastornykh, M.S.; Demidova, I.B.; Kuz' mina, V.A.; Diveeva, V.V., 1984: Dairy cocktail. Several formulae are given for the preparation of a dairy cocktail based on buttermilk or its mixture with whey, plus dairy ice cream, herb extracts and fruit syrup. According to 1 example, the cocktail comprises 60 parts buttermilk, 15 parts whey...

Anonymous, 1989: Abstracts of contributory papers. There are 168 abstracts on animal breeding (dairy cattle, buffaloes, sheep, goats, pigs, horses, rabbits and poultry), progeny testing, cytogenetics, marker genes and biotechnology (evaluation of spermatozoa, the potential for ova transfer in catt...

Kent K.M.; Cooper T., 1972: Metabolic and mechanical responses of intact hearts to hypoxia. Federation Proceedings 31(2): 316