Global increases in UVB irradiance from changes in ozone and cloud-aerosol amounts 1979 to 2008

Jay R. Herman

doi:10.1117/12.828296

24 August 2009 Global increases in UVB irradiance from changes in ozone and cloud-aerosol amounts 1979 to 2008

Jay R. Herman

Proceedings Volume 7462, Ultraviolet and Visible Ground- and Space-based Measurements, Trace Gases, Aerosols and Effects VI; 746206 (2009) https://doi.org/10.1117/12.828296
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

Ultraviolet irradiance (UV from 290 nm to 325 nm) reaching the earth's surface has significantly increased at all latitudes except the equatorial zone since 1979. The annual average increase was caused by a corresponding decrease in ozone amount from1979 to 1998. After 1998, mid-latitude annual average ozone amounts and UV irradiance levels have been approximately constant. Cloud plus aerosol changes over the period from 1979 to 2008 have caused significant moderation of the clear-sky UVB trends based on a preliminary analysis of UV (340 nm) scene reflectivity data from multiple satellites.

Citation Download Citation

Jay R. Herman "Global increases in UVB irradiance from changes in ozone and cloud-aerosol amounts 1979 to 2008", Proc. SPIE 7462, Ultraviolet and Visible Ground- and Space-based Measurements, Trace Gases, Aerosols and Effects VI, 746206 (24 August 2009); https://doi.org/10.1117/12.828296

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