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Processes of vertical exchange in shelf seas

Obiettivo



PROVESS is an interdisciplinary study of the vertical fluxes of properties through the water column and the surface and bottom boundaries. Its objectives are to:
A) Improve understanding and quantification of vertical exchange processes in the water column, particularly in the surface and benthic boundary layers and across the pycnocline;
B) Explore mechanisms of physical-biological coupling in which vertical exchanges and turbulence significantly affect the environmental conditions experienced by biota;
C) Apply innovative technologies to the measurement of physical microstructure features and phenomena, in particular turbulence properties in the water column;
D) Provide a new, comprehensive and synoptic data set for validation of vertical fluxes of energy and matter calculated by physical and biological models;
E) Develop l-D physical models for the computation of statistical moments of microstructure phenomena and integrated biological-physical models of the water column, including fluxes from the surface and the sediment;
F) Test and validate the models against measurements of mean and fluctuating properties in the water column;
G) Provide modules for vertical exchanges which can be implemented instate-of-the-art 3-D water quality and ecological models. The project is founded on the integration of experimental, theoretical and modelling studies of vertical exchanges in shelf seas, including the joint analysis and interpretation of measurements and model calculations. Innovative measurements of turbulence properties in continental shelf seas (dissipationrate throughout the water column and intensity over a wide frequency range) are the heart of the proposal. These, together with biological measurements concentrating on fluxes near the sea bed, will be made at two contrasting sites in the North Sea one shallow, high energy, the other deeper, low energy. Since turbulence directly affects the environment perceived by particles, including living biota, detritus and suspended sediment, studies will be made of aggregation, flocculation and sedimentation, and of trophic interactions. New hypotheses about turbulence effects on zooplankton grazing rates, diet selectivity, vertical distribution and patchiness will be tested against process oriented field and laboratory measurements. Water column numerical models describing turbulent physics and integrated biology/physics willing corporate the understanding gained from the process studies and be rigorously tested against these fundamental measurements, to establish the robustness of parameterisations and the domain of validity of the models. The improved understanding will be applied to the exchange of nutrients across the thermocline and to nutrient recycling in the benthic boundary layer. This fundamental research will contribute towards the long-term goal of developing robust water column plankton models applicable in the full range of turbulence environments encountered in shelf seas. The partnership is well-balanced, with internationally recognized expertise in obtaining and interpreting measurements and in numerical modelling, and can realistically expect to attain the project's innovative goals. 02

Campo scientifico (EuroSciVoc)

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Coordinatore

NATURAL ENVIRONMENT RESEARCH COUNCIL
Contributo UE
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Indirizzo
Birkenhead
PA34 4AD OBAN ARGYLL
Regno Unito

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Partecipanti (15)

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