| Titre | Spatiotemporal downscaling of GRACE total water storage using land surface model outputs |
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| Auteur | Zhong, D ; Wang,
S; Li, J |
| Source | Remote Sensing vol. 13, issue 5, 900, 2021 p. 1-19, https://doi.org/10.3390/rs13050900  Accès ouvert |
| Image |  |
| Année | 2021 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20200787 |
| Éditeur | MDPI |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.3390/rs13050900 |
| Media | papier; en ligne; numérique |
| Formats | pdf; html |
| Province | Alberta |
| SNRC | 72E; 72L; 72M; 73D; 73E; 73L; 73M; 74D; 74E; 74L; 82G; 82H; 82I; 82J; 82O; 82P; 83; 84A; 84B; 84C; 84D; 84E; 84F; 84G; 84H; 84I; 84J; 84K; 84L |
| Lat/Long OENS | -120.0000 -110.0000 58.5000 49.0000 |
| Sujets | eaux de surface; eau souterraine; humidité du sol; neige; glace; télédétection; imagerie par satellite; modèles; puits d'observation; Méthodologie; géophysique; hydrogéologie; Nature et environnement;
Sciences et technologie |
| Illustrations | cartes de localisation; cartes géolscientiques généralisées; graphiques; séries chronologiques; modèles |
| Programme | Centre canadien de télédétection Centre canadien de télédétection, programmed d'eau |
| Diffusé | 2021 02 27 |
| Résumé | (disponible en anglais seulement)
High spatiotemporal resolution of terrestrial total water storage plays a key role in assessing trends and availability of water resources. This study presents
a two-step method for downscaling GRACE-derived total water storage anomaly (GRACE TWSA) from its original coarse spatiotemporal resolution (monthly, 3-degree spherical cap/~300 km) to a high resolution (daily, 5 km) through combining land surface
model (LSM) simulated high spatiotemporal resolution terrestrial water storage anomaly (LSM TWSA). In the first step, an iterative adjustment method based on the self-calibration variance-component model (SCVCM) is used to spatially downscale the
monthly GRACE TWSA to the high spatial resolution of the LSM TWSA. In the second step, the spatially downscaled monthly GRACE TWSA is further downscaled to the daily temporal resolution. By applying the method to downscale the coarse resolution GRACE
TWSA from the Jet Propulsion Laboratory (JPL) mascon solution with the daily high spatial resolution (5 km) LSM TWSA from the Ecological Assimilation of Land and Climate Observations (EALCO) model, we evaluated the benefit and effectiveness of the
proposed method. The results show that the proposed method is capable to downscale GRACE TWSA spatiotemporally with reduced uncertainty. The downscaled GRACE TWSA are also evaluated through in-situ groundwater monitoring well observations and the
results show a certain level agreement between the estimated and observed trends. |
| GEOSCAN ID | 328175 |
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