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@ARTICLE{Martynenko:12237,
      author       = {Martynenko, D. and Holzer-Popp, T. and Elbern, H. and
                      Schroedter-Homscheidt, M.},
      title        = {{U}nderstanding the aerosol information content in
                      multi-spectral reflectance measurements using a synergetic
                      retrieval algorithm},
      journal      = {Atmospheric measurement techniques},
      volume       = {3},
      issn         = {1867-1381},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {PreJuSER-12237},
      pages        = {1589 - 1598},
      year         = {2010},
      note         = {This work was supported by German Aerospace Center. Thanks
                      are especially given to Thomas Holzer-Popp.},
      abstract     = {An information content analysis for multi-wavelength
                      SYNergetic AErosol Retrieval algorithm SYNAER was performed
                      to quantify the number of independent pieces of information
                      that can be retrieved. In particular, the capability of
                      SYNAER to discern various aerosol types is assessed. This
                      information content depends on the aerosol optical depth,
                      the surface albedo spectrum and the observation geometry.
                      The theoretical analysis is performed for a large number of
                      scenarios with various geometries and surface albedo spectra
                      for ocean, soil and vegetation. When the surface albedo
                      spectrum and its accuracy is known under cloud-free
                      conditions, reflectance measurements used in SYNAER is able
                      to provide for 2-4 degrees of freedom that can be attributed
                      to retrieval parameters: aerosol optical depth, aerosol type
                      and surface albedo.The focus of this work is placed on an
                      information content analysis with emphasis to the aerosol
                      type classification. This analysis is applied to synthetic
                      reflectance measurements for 40 predefined aerosol mixtures
                      of different basic components, given by sea salt, mineral
                      dust, biomass burning and diesel aerosols, water soluble and
                      water insoluble aerosols. The range of aerosol parameters
                      considered through the 40 mixtures covers the natural
                      variability of tropospheric aerosols. After the information
                      content analysis performed in Holzer-Popp et al. (2008)
                      there was a necessity to compare derived degrees of freedom
                      with retrieved aerosol optical depth for different aerosol
                      types, which is the main focus of this paper.The principle
                      component analysis was used to determine the correspondence
                      between degrees of freedom for signal in the retrieval and
                      derived aerosol types. The main results of the analysis
                      indicate correspondence between the major groups of the
                      aerosol types, which are: water soluble aerosol, soot,
                      mineral dust and sea salt and degrees of freedom in the
                      algorithm and show the ability of the SYNAER to discern
                      between this aerosol types.The results of the work will be
                      further used for the development of the promising
                      methodology of the construction error covariance matrices in
                      the assimilation system.},
      keywords     = {J (WoSType)},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK406},
      shelfmark    = {Meteorology $\&$ Atmospheric Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000285573200008},
      doi          = {10.5194/amt-3-1589-2010},
      url          = {https://juser.fz-juelich.de/record/12237},
}