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Long-term evolution of the nutrient concentrations on the north-western shelf of the Black Sea
Cociasu, A.; Popa, L.; Buga, L. (1998). Long-term evolution of the nutrient concentrations on the north-western shelf of the Black Sea. Cercet. Mar./Rech. Mar. 1998: 13-29
In: Cercetari Marine = Recherches Marines. Institutul Naţional de Cercetare-Dezvoltare Marină Grigore Antipa: Constanta. ISSN 0250-3069, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Cociasu, A.
  • Popa, L.
  • Buga, L.

Abstract
    Long-term trends in the nutrient loads of the Danube to the Black Sea and the nutrient concentrations evolution on the Romanian shelf are analyzed using daily data collected from the Danube for the period 1980-1997, from Constanta onshore station daily since 1959 and from Constanta offshore station (20 Nm) monthly, between 1963-1995. The principal cause of the long-term ecological changes in the Romanian coastal waters are the shifts in the nutrient content of the Danube, actually dissolved inorganic nitrogen concentrations being 4-5 times and phosphorus about 2 times higher, while silicon concentrations are more than two times less then in 1959. On the Romanian shelf, the highest concentrations have been reached in 1970's; they were considerable decreasing during 1980's and slightly during 1990's.

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