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- W138869894 abstract "Analysis of the chemical and hydrographic data from the R/V Knorr Black Sea Expedition (spring-summer 1988) suggests some significant changes in the distribution of chemicals in the Black Sea. One change is shoaling of the oxic/anoxic interface that may be a continuation of a process that began more than 100 years ago. The ensemble of our data and historical data suggests shoaling of the interface. We frequently detected sulfide within the upper 100m. This shoaling appears to be associated with weakening of the halocline resulting from overall climatic change and is perhaps exacerbated by recent engineering projects that have reduced runoff into the Black Sea. The reduction of the halocline appears to have increased vertical mixing allowing the H[sub 2]S = 0 surface to shoal and results in a weaker sulfide gradient near the oxic/anoxic interface. Our data and 1984 data by Russian investigators suggest a doubling of maximum nitrate concentrations in recent years. This may be due to enhanced vertical mixing resulting from the weakened halocline whereby wintertime mixing deepens to levels were ammonium concentrations are high. We are intrigued that this increase occurred after major engineering projects which decreased runoff and increased the riverine combined nitrogen input. Inmore » contrast to most previous investigators, we did not find a zone where sulfide and dissolved oxygen overlapped. We believe that this reflects differences in methodology, and is therefore an imaginary' change. It is also possible that the shoaling of the oxic/anoxic interface makes conditions more favorable for photosynthetic bacteria that can convert sulfide to free sulfur.« less" @default.
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- W138869894 date "1990-01-09" @default.
- W138869894 modified "2023-09-27" @default.
- W138869894 title "Real on imaginary changes in the chemical hydrography of the Black Sea" @default.
- W138869894 hasPublicationYear "1990" @default.
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