کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4549241 | 1627360 | 2006 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nitrogenous discharges to the eastern Gulf of Finland, the Baltic Sea: Elemental flows, stable isotope signatures, and their estuarine modification
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
اقیانوس شناسی
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چکیده انگلیسی
River Neva nitrate signatures of 15N and 18O indicated major agricultural fertilizer origin of nitrogen, and the isotopic composition was clearly lighter (δ15N-NO3â mean of 2.4â° air) than previously measured from more southern rivers discharging into the Baltic Sea. Because of the light composition of the River Neva N source, close to the 15N signatures of the open Gulf, as well as of the efficient depletion of the inorganic load already in the innermost estuary, straightforward end-member tracer analysis of the transport of N in the basin is problematic. St. Petersburg wastewater ammonium showed, however, high δ15N values (ca. 13â°), which gives a first estimate of 5.8â° for δ15N of the easternmost estuarine total inorganic N source. The available sediment data from the basin (δ15N 6 to 8â°) somewhat exceeds the average source signature. This emphasizes the significance of biological transformation processes, most importantly assimilation of inorganic nitrogen, food web interactions and denitrification, which all involve isotopic fractionation, for the mass balance models describing the dynamics of the sources and sinks of the N cycle of the basin.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Marine Systems - Volume 63, Issues 3â4, December 2006, Pages 191-208
Journal: Journal of Marine Systems - Volume 63, Issues 3â4, December 2006, Pages 191-208
نویسندگان
Pirjo Kuuppo, Timo Tamminen, Maren Voss, Ulrike Schulte,