% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Hoelzemann:4708,
      author       = {Hoelzemann, J.J. and Longo, K.M. and Fonseca, R.M. and do
                      Rosario, N.M.E. and Elbern, H. and Feitas, S.R. and Pires,
                      C.},
      title        = {{R}egional representativity of {AERONET} observation sites
                      during the biomass burning season in {S}outh {A}merica
                      determined by correlation studies with {MODIS} {A}erosol
                      {O}ptical {D}epth},
      journal      = {Journal of Geophysical Research},
      volume       = {114},
      issn         = {0148-0227},
      address      = {Washington, DC},
      publisher    = {Union},
      reportid     = {PreJuSER-4708},
      pages        = {D13301},
      year         = {2009},
      note         = {Judith Hoelzemann is funded by the Brazilian "Fundacao de
                      Amparo a Pesquisa do Estado de Sao Paulo'' (FAPESP) under
                      grant 05/60890-3. This work was carried out with support by
                      FAPESP project (2008/06822-4) and the InterAmerican
                      Institute for Global Change Research (IAI) CRN II 2017,
                      supported by the U.S. National Science Foundation ( grant
                      GEO-0452325). We thank the AERONET principal investigators
                      Brent Holben, Paulo Artaxo, and Enio B. Pereira and their
                      staff for establishing and maintaining the South American
                      sites used in this investigation, the NASA/MODAPS team for
                      providing the whole suite of MODIS collection 5 data, the
                      NASA/MOVAS/ Giovanni team at GES DISC for provision of
                      gridded MODIS data, and two anonymous reviewers who provided
                      very helpful comments that contributed substantially to
                      improve this paper.},
      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 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.},
      keywords     = {J (WoSType)},
      cin          = {ICG-2},
      ddc          = {550},
      cid          = {I:(DE-Juel1)VDB791},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK406},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000267643000001},
      doi          = {10.1029/2008JD010369},
      url          = {https://juser.fz-juelich.de/record/4708},
}