Use of satellite erythemal UV products in analysing the global UV changes 1Earth Observation, Finnish Meteorological Institute, Helsinki, Finland
16 Sep 2011
2Kuopio Unit, Finnish Meteorological Institute, Kuopio, Finland
Received: 11 Apr 2011 – Published in Atmos. Chem. Phys. Discuss.: 06 Jun 2011 Abstract. Long term changes in solar UV radiation affect global bio-geochemistry and
climate. The satellite-based dataset of TOMS (Total Ozone Monitoring System)
and OMI (Ozone Monitoring Instrument) of erythemal UV product was applied for
the first time to estimate the long-term ultraviolet (UV) changes at the
global scale. The analysis of the uncertainty related to the different input
information is presented. OMI and GOME-2 (Global Ozone Monitoring
Experiment-2) products were compared in order to analyse the differences in
the global UV distribution and their effect on the linear trend estimation.
Revised: 12 Sep 2011 – Accepted: 14 Sep 2011 – Published: 16 Sep 2011
The results showed that the differences
in the inputs (mainly surface albedo and aerosol information) used in the retrieval,
affect significantly the UV change calculation, pointing out the importance of
using a consistent dataset when calculating long term UV changes. The areas
where these differences played a major role were identified using global maps of monthly
UV changes. Despite the uncertainties, significant positive UV changes (ranging from 0 to about
5 %/decade) were observed, with higher values in the Southern Hemisphere at mid-latitudes
during spring-summer, where the largest ozone decrease was observed.
Citation: Ialongo, I., Arola, A., Kujanpää, J., and Tamminen, J.: Use of satellite erythemal UV products in analysing the global UV changes, Atmos. Chem. Phys., 11, 9649-9658, doi:10.5194/acp-11-9649-2011, 2011.