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Publikationstyp
Wissenschaftlicher Artikel
Erscheinungsjahr
2018
Eutrophication assessment in the transit area German Bight (North Sea) 2006-2014 - Stagnation and limitations
Eutrophication assessment in the transit area German Bight (North Sea) 2006-2014 - Stagnation and limitations
Autor:innen
Herausgeber
Quelle
Marine Pollution Bulletin
136 (2018), 1 Onlineressource (Pages 68-78)
136 (2018), 1 Onlineressource (Pages 68-78)
Schlagwörter
Eutrophierung, Sauerstoffbedarf, Deutsche Bucht
Forschungskennzahl (FKZ)
Verbundene Publikation
Zitation
BROCKMANN, Uwe, Dilek H. TOPCU, Wera LEUJAK und M. SCHÜTT, 2018. Eutrophication assessment in the transit area German Bight (North Sea) 2006-2014 - Stagnation and limitations. Marine Pollution Bulletin [online]. 2018. Bd. 136 (2018), 1 Onlineressource (Pages 68-78). DOI 10.60810/openumwelt-1941. Verfügbar unter: https://openumwelt.de/handle/123456789/5512
Zusammenfassung englisch
The eutrophication status of the German Bight (North Sea) has been assessed the third time since 1998 according to the OSPAR-Comprehensive Procedure between 2006 and 2014. Since the 1980s nutrient discharges and atmospheric nitrogen deposition had declined significantly but chlorophyll a and nutrient concentrations remained above assessment levels inshore and in inner coastal waters, reflecting continuing eutrophication. Recently local river discharges stagnated or increased again and total nitrogen remained above a reduction target of 200 myM. Most nutrients and conversion products were imported by a coastal current, passing the German Bight. Organic matter was trapped in offshore bottom waters in the ancient Elbe valley, causing repeated annual oxygen minima (<6 mg/L) and a classification as Problem Area. Effects of national reduction measures are limited in the transit area German Bight because improvements in open coastal waters require international efforts, based on comprehensive analyses. © 2018 Elsevier Ltd. All rights reserved.