Several validation studies of surface UV irradiance based on the Ozone Monitoring Instrument (OMI) satellite data have shown a high correlation with ground-based measurements but a positive bias in many locations. The main part of the bias can be attributed to the boundary layer aerosol absorption that is not accounted for in the current satellite UV algorithms. To correct for this shortfall, a post-correction procedure was applied, based on global climatological fields of aerosol absorption optical depth. These fields were obtained by using global aerosol optical depth and aerosol single scattering albedo data assembled by combining global aerosol model data and ground-based aerosol measurements from AERONET. The resulting improvements in the satellite-based surface UV irradiance were evaluated by comparing satellite and ground-based spectral irradiances at various European UV monitoring sites. The results generally showed a significantly reduced bias by 5-20%, a lower variability, and an unchanged, high correlation coefficient. Citation: Arola, A., et al. (2009), A new approach to correct for absorbing aerosols in OMI UV, Geophys. Res. Lett., 36, L22805, doi:10.1029/2009GL041137.
A new approach to correct for absorbing aerosols in OMI UV / A., Arola; S., Kazadzis; A., Lindfors; N., Krotkov; J., Kujanpaa; J., Tamminen; A., Bais; A. D., Sarra; J. M., Villaplana; C., Brogniez; Siani, Anna Maria; M., Janouch; P., Weihs; A., Webb; T., Koskela; N., Kouremeti; D., Meloni; V., Buchard; F., Auriol; I., Ialongo; M., Staneck; S., Simic; A., Smedley; S., Kinne. - In: GEOPHYSICAL RESEARCH LETTERS. - ISSN 0094-8276. - 36:22(2009), p. L22805. [10.1029/2009gl041137]
A new approach to correct for absorbing aerosols in OMI UV
SIANI, Anna Maria;
2009
Abstract
Several validation studies of surface UV irradiance based on the Ozone Monitoring Instrument (OMI) satellite data have shown a high correlation with ground-based measurements but a positive bias in many locations. The main part of the bias can be attributed to the boundary layer aerosol absorption that is not accounted for in the current satellite UV algorithms. To correct for this shortfall, a post-correction procedure was applied, based on global climatological fields of aerosol absorption optical depth. These fields were obtained by using global aerosol optical depth and aerosol single scattering albedo data assembled by combining global aerosol model data and ground-based aerosol measurements from AERONET. The resulting improvements in the satellite-based surface UV irradiance were evaluated by comparing satellite and ground-based spectral irradiances at various European UV monitoring sites. The results generally showed a significantly reduced bias by 5-20%, a lower variability, and an unchanged, high correlation coefficient. Citation: Arola, A., et al. (2009), A new approach to correct for absorbing aerosols in OMI UV, Geophys. Res. Lett., 36, L22805, doi:10.1029/2009GL041137.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
