Similarities and differences in the Earth’s water variations signal provided by GRACE and AMSR-E observations using maximum covariance analysis at various land cover data backgrounds

• Autorzy: Szabó Viktor , Osińska-Skotak Katarzyna

Identyfikatory

DOI

10.2478/arsa-2023-0006

• Języki publikacji: EN

Abstrakty

EN

The study presents a compatibility analysis of gravimetric observations with passive microwave observations. Monitoring the variability of soil water content is one of the essential issues in climate-related research. Total water storage changes (∆TWS) observed by Gravity Recovery and Climate Experiment (GRACE), enables the creation of many applications in hydrological monitoring. Soil moisture (SM) is a critical variable in hydrological studies. Advanced Microwave Scanning Radiometer (AMSR-E) satellite products provided unique observations on this variable in near-daily time resolutions. The study used maximum covariance analysis (MCA) to extract principal components for ∆TWS and SM signals. The analysis was carried out for the global area, dividing the discussion into individual continents. The amplitudes of gravimetric and microwave signals were computed via the complex empirical orthogonal function (EOF) and the complex conjugate EOF* to determine the regions for detailed comparison. Similarities and differences in signal convergence results were compared with land cover data describing soil conditions, vegetation cover, urbanization status, and cultivated land. Convergence was determined using Pearson correlation coefficients and cross-correlation. In order to compare ∆TWS and SM in individual seasons, ∆TWS observations were normalized. Results show that naturally forested areas and large open spaces used for agriculture support the compatibility between GRACE and AMSRE observations and are characterized by a good Pearson correlation coefficient >0.8. Subpolar regions with permafrost present constraints for AMSR-E observations and have little convergence with GRACE observations.

Słowa kluczowe

EN

GRACE; AMSR-E; total water storage anomalies; soil moisture; remote sensors

• Wydawca: Centrum Badań Kosmicznych PAN ; De Gruyter
• Czasopismo: Artificial Satellites : Journal of Planetary Geodesy
• Rocznik: 2023
• Tom: Vol. 58, No. 2
• Strony: 63--87
• Opis fizyczny: Bibliogr. 113 poz., rys.

Twórcy

autor

Szabó Viktor

• Warsaw University of Technology, Faculty of Geodesy and Cartography, Warsaw, Poland

autor

Osińska-Skotak Katarzyna

• Warsaw University of Technology, Faculty of Geodesy and Cartography, Warsaw, Poland

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).