CORDIS bietet Links zu öffentlichen Ergebnissen und Veröffentlichungen von HORIZONT-Projekten.
Links zu Ergebnissen und Veröffentlichungen von RP7-Projekten sowie Links zu einigen Typen spezifischer Ergebnisse wie Datensätzen und Software werden dynamisch von OpenAIRE abgerufen.
Verwertbare Ergebnisse
The basic products are maps of monthly and yearly UV doses received at the ground over the European continent. The maps are obtained using satellite data on ozone (from TOMS and GOME) and cloud effects, derived from TOMS-reflection measurements and/or satellite derived cloud information from ISCCP. The maps can represent the UV radiation intensity weighted with various action spectra (UVB, UVA, erythemal, SCUP-H, DNA, PLANT, etc.). The comparison with ground measurements has demonstrated the validity of the results for monthly and Yearly UV-doses, except over snow-covered areas. Three satellite based approaches for the evaluation of cloud effects on the UV-radiation levels have been compared with a ground based analysis of cloud effects, showing best agreement for monthly averages for the method using daily overpass reflection data.
The product is intended to document the intensity of the UV radiation over Europe for a variety of applications. It complements to the ground measurements performed by means of spectroradiometers, which are available at a limited number of sites and a limited time-period and methods using more detailed satellite data sets with limitations regarding the data-period covered and high requirements for data-manipulation and/or calculations.
The methods have been used to identity, changes and year to year variability of the UV-radiation levels over Europe for the past decades in relation to ozone changes and the results are used in various Environmental Assessment Studies (European and Dutch national). The methods can be directly applied to analyze monthly, and yearly UV radiation doses for Europe for the period 1979-1999 (excluding the years 1995 and 1996), and are linked with a skin cancer risks model to obtain the consequences of changes in terms of possible changes in skin cancer risks. Evaluation of other effects could be implemented.
The basic product is the surface UV irradiance and associated dose rate (CIE, UVA, UVB, Plant... derived from satellite observations from the GOME instrument. Worldwide coverage is provided subjected to the GOME constrains. The satellite (ERS-2) orbital characteristics do allow for a full coverage every 3 days at the equator (less for higher altitude). The methodology makes use of GOME cloud fraction estimation and backscattered radiance to extrapolate the total cloud optical thickness of the scanned pixel. In addition, if the pixel is found to be free of clouds (which is a very rare situation given GOME pixel size), a total aerosol optical thickness is estimated.
This method only relies on one single instrument and can be easily transposed to alternative instruments. The global coverage combined with appropriate statistical interpolation scheme is well suited to climatology studies and long term monitoring using correlative data sources (TOMS, GOME, SCIAMACHY, GOME-2...). Furthermore it allows assessing the potential global changes related to stratospheric ozone depletion.
The basic products are maps of instantaneous surface UV dose rates. These are obtained by interpolation in a table, pre-computed with a radiative transfer model, giving, the surface UV radiation intensity as a function of total solar zenith angle, column ozone, cloud thickness, aerosol load, surface UV albedo and surface altitude. The values for these influencing parameters are estimated from the various input data (satellite and non satellite). The maps can represent the UV radiation intensity weighted with-various action spectra (UVB, UVA, erythemal, SCUP-H, DNA, PLANT, etc.). The dose rate maps can in principle be generated every half-hour (corresponding to the METEOSAT image acquisition). The dose rate maps can then be used to reconstruct daily, monthly or yearly dose maps. The comparison with ground measurement has demonstrated the validity of the results, except over snow-covered areas.
The product is intended to document the intensity of the UV radiation over Europe for a variety of applications. It complements the ground measurements performed by means of spectro-radiometers. The ground measurements will remain the reference but because of their restricted number (a few tens in Europe) they do not provide a good synoptic view. The potential applications include:
- monitoring changes and trends in surface UV, in particular those linked with stratospheric ozone depletion
- impact studies of the UV radiation on human health (skin cancer, cataract ... ) and the environment (marine life, phytoplankton, plants, biological activity in general)
Suche nach OpenAIRE-Daten ...
Bei der Suche nach OpenAIRE-Daten ist ein Fehler aufgetreten
Es liegen keine Ergebnisse vor