Session 4 : UV Observations and Modelling

This session invites papers on measurement studies as well as modelling studies of UV radiation in the troposphere and at the Earth's surface. Reductions in stratospheric ozone are expected to lead to increases in UV radiation at the surface. However, the UV radiation is dependent on many other factors as well, in particular cloud and aerosols. We are particularly interested in receiving contributions that relate to changes in UV to changes in ozone, cloud, and aerosols. The recent ozone assessment (WMO, 1998) highlighted the need for continued improved measurements of UV radiation if future trends in UV (both upward and downward) are to be detected and monitored accurately. Improvements in co-ordination of ground-based measurements will become increasingly important as we attempt to validate the estimations of UV derived from satellites. Eventually it may be expected that the global distribution of trends in UV may be derivable from satellite in the same way as is currently being done for ozone measurements. However, much work is still required to verify the extent to which these satellite methods relate to measurements at the surface. Contributions from both the UV measurement and modelling communities addressing these issues are invited.

 

ORAL PRESENTATIONS

R. McKenzie: Satellite-retrievals of UV compared with ground-based measurements (O/4.1)

C.S. Long: Using the UV index forecasts to independently validate and intercompare surface ultraviolet radiation observations in the United States (O/4.4)

G. Bernhard: Changes in Antarctic UV levels in relation to ozone hole characteristics (O/4.8)

 

FOCUSED DISCUSSIONS

 

N. Chubarova: The influence of cloud and total ozone on biologically active UV interannual variability during the 20th century in different geographical regions (P/4.3)

E. Echer: UV-B and ozone anticorrelations at low and high latitudes (P/4.4)

R. Piacentini: Solar ultraviolet irradiance incident on the Atacama desert region (P/4.5)

C. Rafanelli: UV Green model and SUV 100 & BREWER spectra: an intercomparison in Ushuaia (P/4.12)

J.P. Veefkind: The ozone monitoring instrument (OMI) (P/4.13)

N. J. Muthama: Modeling ultraviolet radiation using DOBSON spectrophotometer (P/4.14)

J. Sabburg: Corrected UV irradiances from the U.S. EPA/NUVMC network of BREWER spectroradiometers and comparisons of DUV values with satellite data (P/4.17)

P.M. Udelhofen: Comparison of measurements of surface UVR and TOMS satellite data over Australia: Health implications (P/4.18)

E. Echer: A comparison of direct and global UV-B X ozone anticorrelations (P/4.26)

A.A. da Silva: BREWER spectrophotometer UV-B measurements for aerosol optical thickness determinations during biomass burning (P/4.27)

G.R. Casale: An investigation of high and low frequency ozone and UV variations (P/4.31)

G. Palancar: Ultraviolet radiation studies in Cordoba, Argentina (P/4.32)

R. Piacentini: Ozone profiles and its influence on solar UVB irradiance incident over Buenos Aires, Argentina (P/4.35)

 


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Session 1 : Stratospheric Processes and their Role in Climate Session 2 : Stratospheric Indicators of Climate Change
Session 3 : Modelling and Diagnosis of Stratospheric Effects on Climate Session 4 : UV Observations and Modelling
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