@Article{HoelzemannLoFoRoElFrPi:2009:ReReAE,
               author = "Hoelzemann, Judith J. and Longo, Karla Maria and Fonseca, Rafael 
                         Mello and Ros{\'a}rio, Nilton M. E. do and Elbern, Hendrik and 
                         Freitas, Saulo Ribeiro de and Pires, Carlos",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Universidade de S{\~a}o Paulo 
                         (USP)} and {University of Cologne} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)}",
                title = "Regional representativity of AERONET observation sites during the 
                         biomass burning season in South America determined by correlation 
                         studies with MODIS Aerosol Optical Depth",
              journal = "Journal of Geophysical Research",
                 year = "2009",
               volume = "114",
               number = "D13301",
                month = "jul.",
             keywords = "air pollution, satellite aerosol products, biomass burning.",
             abstract = "This paper presents an analysis of ground-based Aerosol Optical 
                         Depth (AOD) observations by the Aerosol Robotic Network (AERONET) 
                         in South America from 2001 to 2007 in comparison with the 
                         satellite AOD product of Moderate Resolution Imaging 
                         Spectroradiometer (MODIS), aboard TERRA and AQUA satellites. Data 
                         of 12 observation sites were used with primary interest in AERONET 
                         sites located in or downwind of areas with high biomass burning 
                         activity and with measurements available for the full time range. 
                         Fires cause the predominant carbonaceous aerosol emission signal 
                         during the dry season in South America and are therefore a special 
                         focus of this study. Interannual and seasonal behavior of the 
                         observed AOD at different sites were investigated, showing clear 
                         differences between purely fire and urban influenced sites. An 
                         intercomparison of AERONET and MODIS AOD annual correlations 
                         revealed that neither an interannual long-term trend may be 
                         observed nor that correlations differ significantly owing to 
                         different overpass times of TERRA and AQUA. Individual anisotropic 
                         representativity areas for each AERONET site were derived by 
                         correlating daily AOD of each site for all years with available 
                         individual MODIS AOD pixels gridded to 1° × 1°. Results showed 
                         that for many sites a good AOD correlation (R2 > 0.5) persists for 
                         large, often strongly anisotropic, areas. The climatological areas 
                         of common regional aerosol regimes often extend over several 
                         hundreds of kilometers, sometimes far across national boundaries. 
                         As a practical application, these strongly inhomogeneous and 
                         anisotropic areas of influence are being implemented in the 
                         tropospheric aerosol data assimilation system of the Coupled 
                         Chemistry-Aerosol-Tracer Transport Model coupled to the Brazilian 
                         Regional Atmospheric Modeling System (CCATT-BRAMS) at the 
                         Brazilian National Institute for Space Research (INPE). This new 
                         information promises an improved exploitation of local site 
                         sampling and, thus, chemical weather forecast.",
           copyholder = "SID/SCD",
                  doi = "10.1029/2008JD010369",
                  url = "http://dx.doi.org/10.1029/2008JD010369",
                 issn = "0148-0227",
             language = "en",
           targetfile = "hoelzemann_regional.pdf",
        urlaccessdate = "05 maio 2024"
}