Natural background concentrations of nutrients in the German Bight area (North Sea)

被引:21
作者
Topcu, Dilek [1 ]
Behrendt, Horst [2 ]
Brockmann, U. [1 ]
Claussen, U. [3 ]
机构
[1] Univ Hamburg, Ctr Marine & Climate Res, Inst Biogeochem & Marine Chem, D-20146 Hamburg, Germany
[2] Inst Freshwater Ecol & Inland Fisheries, D-12561 Berlin, Germany
[3] German Environm Agcy, D-06844 Dessau, Germany
关键词
Nutrients; Natural background concentrations; Eutrophication assessments; Rivers; Coastal water; North Sea; N-AND-P; RIVER RHINE; BALTIC SEA; NITROGEN; COASTAL; MODEL; EUTROPHICATION; PHOSPHORUS; ESTUARINE; FLUXES;
D O I
10.1007/s10661-010-1463-y
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Natural background concentrations of nutrients are needed for the assessments of eutrophication processes and their status. Natural background concentrations of total nitrogen (TN) and total phosphorus (TP) were modelled for the rivers discharging into the German Bight and the Rhine considering individual catchment sizes, freshwater flows and soil types. These data were validated by comparison with data from unpolluted rivers. The consistency of modelled and some compiled nutrient concentrations was confirmed by their area-specific load dependency on freshwater discharges. Pristine inorganic nutrient concentrations were deduced from modelled relations to TN and TP in unpolluted rivers. Pristine nutrient gradients between rivers and offshore waters were estimated by linear mixing until a salinity of 32, continued by hyperbolic fits towards recent mean offshore values (salinity 34.5-35). Based on these gradients and recent mean salinities, maps of pristine surface gradients were plotted for the whole German Bight. Variability was transferred from recent conditions as percentage of standard deviation. Reported historical nutrient data and concentrations from unpolluted rivers, coastal and offshore North Sea waters are discussed concerning their relations to natural background conditions.
引用
收藏
页码:361 / 388
页数:28
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