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Acceleration signal in GRACE time-variable gravity in relation to interannual hydrological changes

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Title: Acceleration signal in GRACE time-variable gravity in relation to interannual hydrological changes
Authors: Ogawa, Ryoko Browse this author
Chao, Benjamin F. Browse this author
Heki, Kosuke Browse this author →KAKEN DB
Keywords: Satellite geodesy
Time variable gravity
Global change from geodesy
Issue Date: Feb-2011
Publisher: the Royal Astronomical Society and Blackwell Publishing
Journal Title: Geophysical Journal International
Volume: 184
Issue: 2
Start Page: 673
End Page: 679
Publisher DOI: 10.1111/j.1365-246X.2010.04843.x
Abstract: We use 6 yr of data of the GRACE (Gravity Recovery and Climate Experiment) satellite mission, which yield estimation for interannual signals in gravity changes. We solve for such signals in the form of not only linear trend but also quadratic term (acceleration/deceleration) of mass variations globally at a spatial resolution of 500 km. On continents they signify hydrological mass transport, where any linear trend in precipitation minus evepotranspiration is the input to and hence responsible for, the quadratic change in continental water storage and hence in gravity. Comparison studies of geographical patterns of the quadratic (representing acceleration/ deceleration) terms show interesting agreement of the hydrological model GLDAS with GRACE data in many major areas, providing independent assessment as to the quality and validity of the hydrological models for interannual applications.
Rights: The definitive version is available at
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 日置 幸介

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