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Design and assessment of global, european and regional scale UV irradiance maps based on satellite data and ground measurments.

Objectif



The main objective of MAUVE is to establish maps of surface W radiation, derived from satellite data, as a recognised source of information for a variety of applications including trend studies, documentation of potential environmental changes and risks assessment for human health. Only satellite derived W maps can provide the needed global and synoptic information. Indeed, although the ground network of instruments will always retain its reference role in terms of accuracy, its density is and will remain limited, even in Europe but evidently in less favoured areas of the world. However, the use of satellite derived maps of surface W radiation is presently impaired by their poorly assessed accuracy. Therefore, key tasks in MAWE are to improve the existing products, customise them to the users needs and validate them against reference ground measurements.
The MAUVE products will be based on methodologies developed in the framework of several national ongoing activities. The Institutes conducting these projects are Partners in MAWE and aim at integrating their approaches into two validated products: global and high spatial resolution. Five of the MAUVE Partners are also future users of the surface UV radiation maps and other end users are associated to the project.
A goal in terms of accuracy is not easy to define because the achievable result will depend on the meteorological conditions (clouds, aerosols) and other environmental factors such as e.g. the presence of snow. The accuracy will also be very different for instantaneous observations or, for instance, monthly averages. Therefore, instead of trying to define the products on an abstract basis and risking to issue requirements which will rapidly prove to be impossible to fulfil, the project starts by building and assessing a demonstration data set. The requirements are then defined using this initial information.
Apart from the accuracy, other characteristics of the products have to be defined such as the geographical and temporal coverage, the map content (spectra, dose rates, extrapolated doses, temporal averages), etc. . The first phase of the project will result in the definition of a "pilot data set" to be produced and assessed.
The necessary improvements are the object of the second main work package. Although the precise goals for these improvements will be defined in the first phase, we already know that the main issues will be a better assimilation of data on clouds, aerosols and surface albedo. Tasks have been planned on these topics. The final phase of the project will consist in a thorough assessment/validation of the achieved results and in the definition of requirements to possible operational services for providing satellite derived surface UV radiation maps.
A WEB page (linked to the CEO ES/EWSE) will include a comprehensive description of the project, news about the project, links to download the electronic versions of the reports and examples of the produced UV maps. One main function of this page will be to extend the user base for the information produced by MAUVE. Interested new potential users will be invited to provide their requirements and to participate in the MAUVE workshops. The results of MAUVE will also be published on CD-ROM.

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Coordinateur

BELGIAN INSTITUTE FOR SPACE AERONOMY
Contribution de l’UE
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Adresse
3,Ringlaan 3
1180 BRUXELLES
Belgique

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