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Tropospheric NO2 Column and Aerosol Optical Properties from SCIAMACHY in the Northern Italy

Andrea Petritoli(1), Elisa Palazzi(2), Giorgio Giovanelli(1), Walter Di Nicolantonio(3), Stefano Scarpanti(4), Alessandra Cacciari(5), Enrico Morisi(4), Simonetta Pagnutti(6) and Rodolfo Guzzi(7)

(1) CNR, via P. Gobetti 101, I-40129, Bologna, Italy
(2) CNR, via P. Gobetti 101, I-40129, Italy
(3) CGS, via P .Gobetti 101, I-40129, Bologna, Italy
(4) CGS, via P. Gobetti 101, I-40129, Bologna, Italy
(5) CGS, via P. Gobetti 101, I-40129 Bologna, Italy
(6) ENEA, Via don Fiammelli, 2, I-40128, Bologna, Italy
(7) ASI, Viale Liegi, 26, I-00198, Roma, Italy

Abstract

Air Mass Factor (AMF) is a key parameter for definition of the accuracy of NO2 Tropospheric Vertical Column Density (TVCD) measurements obtained from space. Even when considering only clear sky conditions many factors have relevant influence on the AMF calculation and, over large polluted area, the aerosol loading is a leading factor that should be taken into account to improve the accuracy of the TVCD of NO2. For this purpose corresponding and simultaneous retrieval of the tropospheric aerosol optical properties related to the same column is advisable. In this work we use TVCD of NO2 from SCIAMACHY processed at ISAC with the Satellite DOAS Retrieval Processor (SDRP1.0) and simultaneous retrieved Aerosol Optical Properties (AOP) processed at ISAC/CGS by using Aerosol retrieval from SCIAMACHY data Processor (ASP2.2). We will focus the analysis on the Northern Italy geographical region where also satellite observations have demonstrated the presence of high level of tropospheric NO2 and aerosol. For selected case studies in the year 2004 the AOP observations will be assimilated in the PROMSAR radiative transfer model to calculate an ad hoc AMF related to each of the SCIAMACHY pixel in the area of interest. The effect on the NO2 TVCD retrieval is discussed also as a function of the season.

 

Full paper

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry