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Evaluation of GRACE data for water resource management in Iberia: a case study of groundwater storage monitoring in the Algarve region
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Orientador(es)
Resumo(s)
Study region: Iberia, Algarve basin, South Portugal.
Study focus: This study evaluates the performance of several GRACE products in Iberia using the
closure of the water budget. Then, it focusses on the Algarve region and explores the potential of
GRACE as a tool of quantitative groundwater monitoring capable of bridging gaps in the existing
ground-based network. Monthly data from GRACE, ancillary datasets from E-OBS, GLEAM, GRUN
and ERA5, and groundwater level measurements from 12 karst-porous aquifers in the Algarve
basin (5000 km2) are analyzed from 2004 to 2014.
New Hydrological Insights for the Region: When considering the closure of the water budget at the
Iberian scale, GRACE Mascon solutions perform remarkably well and better than the products
based on spherical harmonics. When considering only the Algarve region, the results are similar
to the ones obtained for Iberia, but the GRACE solution that performs the best is the average of the
CSR and JPL Mascon products. In spite of the Algarve’s extremely small area when compared to
the GRACE footprint, the satellite is capable of capturing the regionally averaged seasonal and deseasonalized
variations in observed groundwater storage (correlation between GRACE-derived
and regionally averaged ground-based measurements is 0.82). For the first time ever at the
regional Algarve scale, bounds are placed on the aquifer’s storage properties which vary from
3.65 × 10 3 to 4.92 × 10 2.
Descrição
Palavras-chave
Iberia Algarve GRACE Groundwater Storativity
Contexto Educativo
Citação
Editora
Elsevier