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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Regional representativity of AERONET observation sites during the biomass burning season in South America determined by correlation studies with MODIS Aerosol Optical Depth

Texto completo
Hoelzemann, Judith J. [1] ; Longo, Karla M. [1] ; Fonseca, Rafael M. [1] ; do Rosario, Nilton M. E. [2] ; Elbern, Hendrik [3, 4] ; Freitas, Saulo R. [1] ; Pires, Carlos [5]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Brazilian Natl Inst Space Res, Ctr Weather Forecast & Climate Studies, BR-12630000 Cachoeira Paulista, SP - Brazil
[2] Univ Sao Paulo, Inst Astron Geophys & Atmospher Sci, BR-05508090 Sao Paulo - Brazil
[3] Univ Cologne, Rhenish Inst Environm Res, D-50931 Cologne - Germany
[4] Res Ctr Juelich, Inst Chem & Dynam Geosphere 2, Julich - Germany
[5] Brazilian Natl Inst Space Res, Satellites & Environm Syst Div, BR-12630000 Cachoeira Paulista, SP - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Citações Web of Science: 20

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 degrees x 1 degrees. Results showed that for many sites a good AOD correlation (R(2) > 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. (AU)

Processo FAPESP: 08/06822-4 - Assimilação de aerossóis e gases traço para o modelo ambiental CCATT-BRAMS
Beneficiário:Judith Johanna Hoelzemann
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 05/60890-3 - Assimilação de aerossóis atmosféricos por satélite no modelo de transporte químico Catt - BRAMS
Beneficiário:Judith Johanna Hoelzemann
Linha de fomento: Bolsas no Brasil - Pós-Doutorado