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Turkish Journal of Fisheries and Aquatic Sciences 2014, Vol 14, Num, 5     (Pages: 981-992)

The Black Sea Nitrogen Budget Revision in Accordance with Recent Atmospheric Deposition Study

Sergiy Medinets 1-2-3

1 Odessa National I. I. Mechnikov University (ONU), 7 Mayakovskogo lane, 65082, Odessa, Ukraine
2 Institute for Meteorology and Climate Research, Karlsruhe Institute of Technology (KIT), Kreuzeckbahnstr. 19, D-82467 Garmisch-Partenkirchen, Germany
3 Albert-Ludwigs-Universität Freiburg, Tennenbacherstr. 4, D-79106 Freiburg, Germany
DOI : 10.4194/1303-2712-v14_4_18 Viewed : 4579 - Downloaded : 4165 To date, most of published nitrogen (N) budget assessments for marine ecosystems (particularly, the Black Sea) are, unfortunately, rather general and incomprehensive due to regular atmospheric load underestimation and frequent neglecting of some relevant N cycling constituents (e.g., N2 fixation rate, dumping, shipping, gaseous emission, chemo denitrification). In this study it has been argued that atmospheric input was systematically underestimated in most of previous assessments of, since organic N constituents were not included. It has been experimentally found that organic part in atmospheric deposition was dominant (~66% or 1777 ± 678 kg N km-2) N pollutant constituent, while DIN was ~34% (907 ± 361 kg N km-2) only during 2011–2012 campaign. Besides, contributions of water soluble (24.3%) and particulate (28.3%) organic N were distributed approximately equally in atmospheric deposition. Overall, an important role of atmospheric N organic pollutants in deposition, which was neglected before, has been proved. As a results, an average annual atmospheric bulk deposition rate of total N (TN) has been calculated as 2684±316 kg N km-2 based on long-term experimental dataset, thus atmospheric TN load for the whole Black Sea area has been estimated as 1159 ± 136 Gg N.

During this study N budget for the Black Sea has been revised and its constituents have been amended. According to presented estimation of N balance the Black Sea is under strong pressure of anthropogenic N load (approximately 798-1692 Gg N y-1), mainly from atmosphere and the north-western rivers. Weak understudied points and uncertainties, to which the Black Sea countries’ research community should pay attention and focus its efforts immediately, have been highlighted. Keywords : Black Sea, atmospheric deposition, N budget, TN, TON, DIN, WSON