A new approach to correct for absorbing aerosols in OMI UV

doi:doi:10.1029/2009GL041137

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 36, L22805, 5 PP., 2009
doi:10.1029/2009GL041137

A new approach to correct for absorbing aerosols in OMI UV

A. Arola

Kuopio Unit, Finnish Meteorological Institute, Kuopio, Finland

S. Kazadzis

Climate Change Research Unit, Finnish Meteorological Institute, Helsinki, Finland

A. Lindfors

Climate Change Research Unit, Finnish Meteorological Institute, Helsinki, Finland

N. Krotkov

Goddard Earth Sciences and Technology Center, University of Maryland Baltimore County, Baltimore, Maryland, USA

J. Kujanpää

Earth Observation Unit, Finnish Meteorological Institute, Helsinki, Finland

J. Tamminen

Earth Observation Unit, Finnish Meteorological Institute, Helsinki, Finland

A. Bais

Laboratory of Atmospheric Physics, Aristotle University, Thessaloniki, Greece

A. di Sarra

ENEA, Climate Laboratory, Rome, Italy

J. M. Villaplana

Earth Observation, Remote Sensing and Atmosphere Department, Instituto Nacional de Tecnica Aeroespacial, Mazagon, Spain

C. Brogniez

Laboratoire d'Optique Atmospherique, Universite des Sciences et Technologies de Lille Villeneuve d'Ascq, Villeneuve d'Ascq, France

A. M. Siani

Physics Department, Sapienza University of Rome, Rome, Italy

M. Janouch

Czech Hydrometeorological Institute, Hradec Kralove, Czech Republic

P. Weihs

Institute of Meteorology, Universitat für Bodenkultur, Vienna, Austria

A. Webb

Centre for Atmospheric Sciences, University of Manchester, Manchester, UK

T. Koskela

Climate Change Research Unit, Finnish Meteorological Institute, Helsinki, Finland

N. Kouremeti

Laboratory of Atmospheric Physics, Aristotle University, Thessaloniki, Greece

D. Meloni

ENEA, Climate Laboratory, Rome, Italy

V. Buchard

Laboratoire d'Optique Atmospherique, Universite des Sciences et Technologies de Lille Villeneuve d'Ascq, Villeneuve d'Ascq, France

F. Auriol

Laboratoire d'Optique Atmospherique, Universite des Sciences et Technologies de Lille Villeneuve d'Ascq, Villeneuve d'Ascq, France

I. Ialongo

Physics Department, Sapienza University of Rome, Rome, Italy

M. Staneck

Czech Hydrometeorological Institute, Hradec Kralove, Czech Republic

S. Simic

Institute of Meteorology, Universitat für Bodenkultur, Vienna, Austria

A. Smedley

Centre for Atmospheric Sciences, University of Manchester, Manchester, UK

S. Kinne

MPI for Meteorology, Hamburg, Germany

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.

Received 25 September 2009; accepted 16 October 2009; published 21 November 2009.

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.

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