Daily Regional Gravity Field Estimation Using GRACE Follow‐On Line‐of‐Sight Gravity Differences DOI
Hao‐si Li, Shuang Yi, Shin‐Chan Han

et al.

Journal of Geophysical Research Solid Earth, Journal Year: 2025, Volume and Issue: 130(5)

Published: May 1, 2025

Abstract As a complement to the conventional monthly global solutions by Gravity Recovery and Climate Experiment series of gravimetric satellites, this study proposes an alternative method for estimating daily regional gravity field utilizing orbital Line‐of‐Sight Difference. The is based on Slepian B‐spline basis functions spatial temporal parameterizations, respectively. Such parameterization can be used estimate total water storage change in way compatible with surface mass estimation previously designed framework determination. formal uncertainty changes recovery ∼5 Gt, equivalent ∼3 cm height over 400 2 km . In evaluation part, applied 2020 Bangladesh flood 2021 Australian flood. Our approach demonstrates strong agreement previous mascon‐based studies, yielding Nash‐Sutcliffe Efficiency values exceeding 0.81, capturing onset recession flooding events. Additionally, we investigate impact data gaps, occasionally occur space‐borne missions employing intersatellite laser ranging system. findings indicate that effectively determines even missing rates up 20% or gap lengths no longer than days, highlighting its reliability continuous monitoring challenging observational scenarios. By providing new methodological daily‐scale from satellite gravimetry, work advances our understanding rapid evolution climate extremes, which will ultimately facilitate future disaster adaption efforts.

Language: Английский

Daily Regional Gravity Field Estimation Using GRACE Follow‐On Line‐of‐Sight Gravity Differences DOI
Hao‐si Li, Shuang Yi, Shin‐Chan Han

et al.

Journal of Geophysical Research Solid Earth, Journal Year: 2025, Volume and Issue: 130(5)

Published: May 1, 2025

Abstract As a complement to the conventional monthly global solutions by Gravity Recovery and Climate Experiment series of gravimetric satellites, this study proposes an alternative method for estimating daily regional gravity field utilizing orbital Line‐of‐Sight Difference. The is based on Slepian B‐spline basis functions spatial temporal parameterizations, respectively. Such parameterization can be used estimate total water storage change in way compatible with surface mass estimation previously designed framework determination. formal uncertainty changes recovery ∼5 Gt, equivalent ∼3 cm height over 400 2 km . In evaluation part, applied 2020 Bangladesh flood 2021 Australian flood. Our approach demonstrates strong agreement previous mascon‐based studies, yielding Nash‐Sutcliffe Efficiency values exceeding 0.81, capturing onset recession flooding events. Additionally, we investigate impact data gaps, occasionally occur space‐borne missions employing intersatellite laser ranging system. findings indicate that effectively determines even missing rates up 20% or gap lengths no longer than days, highlighting its reliability continuous monitoring challenging observational scenarios. By providing new methodological daily‐scale from satellite gravimetry, work advances our understanding rapid evolution climate extremes, which will ultimately facilitate future disaster adaption efforts.

Language: Английский

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