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@ARTICLE{Schrder:865885,
      author       = {Schröder, Stefan and Springer, Anne and Kusche, Jürgen
                      and Uebbing, Bernd and Fenoglio-Marc, Luciana and
                      Diekkrüger, Bernd and Poméon, Thomas},
      title        = {{N}iger discharge from radar altimetry: bridging gaps
                      between gauge and altimetry time series},
      journal      = {Hydrology and earth system sciences},
      volume       = {23},
      number       = {10},
      issn         = {1607-7938},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2019-05164},
      pages        = {4113 - 4128},
      year         = {2019},
      abstract     = {The Niger River represents a challenging target for
                      deriving discharge from spaceborne radar altimeter
                      measurements, particularly since most terrestrial gauges
                      ceased to provide data during the 2000s. Here, we propose
                      deriving altimetric rating curves by “bridging” gaps
                      between time series from gauge and altimeter measurements
                      using hydrological model simulations. We show that classical
                      pulse-limited altimetry (Jason-1 and Jason-2, Envisat, and
                      SARAL/Altika) subsequently reproduces discharge well and
                      enables continuing the gauge time series, albeit at a lower
                      temporal resolution. Also, synthetic aperture radar (SAR)
                      altimetry picks up the signal measured by earlier altimeters
                      quite well and allows the building of extended time series
                      of higher quality. However, radar retracking is necessary
                      for pulse-limited altimetry and needs to be further
                      investigated for SAR. Moreover, forcing data for calibrating
                      and running the hydrological models must be chosen
                      carefully. Furthermore, stage–discharge relations must be
                      fitted empirically and may need to allow for break points.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000488980200002},
      doi          = {10.5194/hess-23-4113-2019},
      url          = {https://juser.fz-juelich.de/record/865885},
}