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@ARTICLE{Han:21360,
      author       = {Han, X. and Li, X. and Hendricks-Franssen, H.J. and
                      Vereecken, H. and Montzka, C.},
      title        = {{S}patial horizontal correlation characteristics in the
                      land data assimilation of soil moisture},
      journal      = {Hydrology and earth system sciences},
      volume       = {16},
      issn         = {1027-5606},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {PreJuSER-21360},
      pages        = {1349 - 1363},
      year         = {2012},
      note         = {This work was supported by the National High-tech Program
                      (863) of China (grant number: 2009AA122104), the Knowledge
                      Innovation Program of the Chinese Academy of Sciences (grant
                      number: KZCX2-EW-312) and the NSFC (National Science
                      Foundation of China) project (grant number: 40901160,
                      40925004). Carsten Montzka received financial support from
                      the DFG (German Science foundation) by means of the project
                      TR-32 "Patterns in Soil-Vegetation-Atmosphere systems:
                      Monitoring, modeling and data assimilation", which is
                      gratefully acknowledged. The data used in this study were
                      acquired as part of the mission of NASA's Earth Science
                      Division and archived and distributed by the Goddard Earth
                      Sciences (GES) Data and Information Services Center (DISC).},
      abstract     = {Remote sensing images deliver important information about
                      soil moisture, but often cover only part of an area, for
                      example due to the presence of clouds or vegetation. This
                      paper examines the potential of incorporating the spatial
                      horizontal correlation characteristics of surface soil
                      moisture observations in land data assimilation in order to
                      obtain improved estimates of soil moisture at uncovered grid
                      cells (i.e. grid cells without observations). Observing
                      system simulation experiments were carried out to assimilate
                      the synthetic surface soil moisture observations into the
                      Community Land Model for the Babaohe River Basin in
                      northwestern China. The estimation of soil moisture at the
                      uncovered grid cells was improved when information about
                      surrounding observations and their spatial correlation
                      structure was included. Including an increasing number of
                      observations for covered and uncovered grid cells in the
                      assimilation procedure led to a better prediction of soil
                      moisture with an upper limit of five observations. A further
                      increase of the number of observations did not further
                      improve the results for this specific case. High
                      observational coverage resulted in a better assimilation
                      performance, depending also on the spatial distribution of
                      observation data. In summary, the spatial horizontal
                      correlation structure of soil moisture was found to be
                      helpful for improving the surface soil moisture data
                      characterization, especially for uncovered grid cells.},
      keywords     = {J (WoSType)},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Geosciences, Multidisciplinary / Water Resources},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000304049700007},
      doi          = {10.5194/hess-16-1349-2012},
      url          = {https://juser.fz-juelich.de/record/21360},
}