Satellite-based hydrological dynamics of the world's largest continuous wetland
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Data
2015-12
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Resumo
We investigate the potential for closing thewater balance purely from remote sensing (RS) sources and quantify
the hydrological dynamic of the Pantanal (Brazil), the world's largest continuous wetland.We use 10-year time
series of totalwater storage changes (ΔS) derived fromGRACE and the balance between precipitation (P) derived
fromTRMMand evapotranspiration (ET) derived fromMOD16, aswell as the overall vegetation response (EVI2)
to water availability. The GRACE-estimates of total water storage were consistent with in situ measurements
from the Ladário gauge station. Despite the coarse spatial resolution of GRACE, its estimates were able not only
to represent the hydrological regime of the entire basin but also its internal variability. The total water storage
change estimates correlated well with precipitation (r = 0.87), evapotranspiration (r = 0.83), and vegetation
greenness (r = 0.85), particularly when a two to three month time lag was considered. Likewise, the MODISderived
vegetation greenness was consistent with variations in precipitation (r=0.77) and evapotranspiration
(r = 0.79). Nevertheless, we found that the water balance could not be closed with these data. Inferred runoff
was greatly overestimated due mainly to an underestimation of ET. The uncertainty in the inputs and scarce validation
data were limiting factors.
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Palavras-chave
Pantanal wetlands, Satellite-based water balance, Upper Paraguay, River basin
Citação
PENATTI, Natasha Costa et al. Satellite-based hydrological dynamics of the world's largest continuous wetland. Remote Sensing of Environment, Amsterdam, v. 170, p. 1-13, Dec. 2015.