Description: Das Projekt "key coastal processes in the mesotrophic Skagerrak and the oligotrophic northern Aegean : a comparative study" wird vom Umweltbundesamt gefördert und von ISW Wassermesstechnik Dr. Hartmut Prandke durchgeführt. General Information: This project focuses on investigation and modelling of key processes that affect flow and cycling of carbon and nutrients. In particular, we aim to study how processes change over scales from microns to tens of metres, and to compare processes under two contrasting situations, stratified and mixed water masses. By comparing the Skagerrak with the NE Aegean, we will be able to study differences in functioning between a mesotrophic and an oligotrophic system. There are important differences in sedimentological and geochemistry setting such as higher content of calcareous material in the N. Aegean which are expected to lead to different rates and processes of nutrient recycling, and erosion, transport, deposition, and accumulation of particulate matter. Nutrient regimes are very different and the Skagerrak is relatively turbid with high light attenuation whereas the N. Aegean has clearer water with extremely low attenuation. It is thus likely that not only will primary production processes be different but behavioural differences in zooplankton e.g. predator avoidance, vertical migration, grazing etc. Biological coagulation (packaging) processes are likely to be very different between the two areas and this is expected to have a major influence on flux rates. The benthic systems differ in that biomass and abundances are higher in the Skagerrak but species diversity is higher in the N. Aegean. Thus the processes and rates of mineralisation and material burial will vary. The project is formed around a set of hypotheses defined for each of the key processes identified. The work will be aimed not at establishing mass balances by direct measurement, but will instead focus on the characterisation and modelling of the key processes occurring. Novel aspects include use of high frequency samplers to make in situ measurements of the microstructure, which can considerably improve our understanding of the vertical turbulent transport and of the velocity fluctuations across frontal areas to gain better insight into local biological and physical processes. A state of the art benthic lander will be used to measure respiration and recycling rates of carbon and nutrient elements in sediments in-situ. Large temporal and spatial variability in the near-surface turbulence is expected, which will be investigated on the basis of measurements and l-D modelling. Processes in the organic part of the benthic nitrogen cycle are of major interest as these processes, their regulation and quantitative importance, to a large degree determines the nitrogen sources that eventually will escape to the overlying water. Thus, knowledge on factors regulating processes of organic nitrogen turnover is necessary in the understanding of mechanisms regulating the internal loading. Further, this knowledge is indispensable in the construction of predictive models. ... Prime Contractor: University of Oslo, Department of Biology, Division of Zoology; Oslo; Norway.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Nährstoffrückgewinnung ? Oslo ? Biopharmazeutikum ? Verhaltensmuster ? Norwegen ? Geochemie ? Kohlenstoff ? Meeressediment ? Meerwasser ? Nährstoff ? Rohwasser ? Organische Stickstoffverbindung ? Zoologie ? Zooplankton ? Blei ? Erosion ? Benthos ? Chemie ? Flockung ? Meeresorganismen ? Messprogramm ? Marines Ökosystem ? Ökotoxikologische Bewertung ? Oligotrophie ? Recyclingquote ? Sedimentanalyse ? Zeitreihenanalyse ? Prädator ? Geologischer Prozess ? Modellierung ? Artenvielfalt ? Nährstoffkreislauf ? Niedrigwasser ? Fallstudie ? Atmung ? In-Situ-Messung ? Prognosemodell ? Geologie ? Gewässergrund ? Hydrobiologie ? Stand der Technik ? Stickstoffkreislauf ? Stoffbilanz ? Studie ? Trophiegrad ? Vergleichsanalyse ? Wasserqualität ? Wasserinhaltsstoff ? Koagulation ? Kohlenstoffkreislauf ? Deposition ? Sediment ? Beweidung ? Meeresgewässer ? Küstenregion ? Wasser ? Verkaufsverpackung ? Bioakkumulation ? Meeresströmung ? Mineralisation ? Informationsgewinnung ? Probenahme ? Verfahrensvorschrift ? Lichtstreuung ? Partikel ? Stofftransport ? in situ ? Sedimentation ? Bestattung ? Trübung ? Physikalischer Vorgang ? Biodiversität ? Biomasse ? Migration ? Turbulenz ? Biomasseproduktion ? Skagerrak ? Ägäis ? Kalkgehalt ?
Region: Mecklenburg-Western Pomerania
Bounding box: 12.5° .. 12.5° x 53.83333° .. 53.83333°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1998-05-01 - 2001-04-30
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