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

NCUIR > College of Earth Sciences > Department of Earth Sciences > journal & Dissertation > Item 987654321/50556

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50556

Title:	Acceleration signal in GRACE time-variable gravity in relation to interannual hydrological changes
Authors:	Ogawa,R;Chao,BF;Heki,K
Contributors:	地球科學系
Keywords:	ICE MASS-LOSS;SATELLITE GRAVIMETRY;SYSTEM;VARIABILITY;FIELD
Date:	2011
Issue Date:	2012-03-27 17:36:43 (UTC+8)
Publisher:	國立中央大學
Abstract:	P>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.
Relation:	GEOPHYSICAL JOURNAL INTERNATIONAL
Appears in Collections:	[Department of Earth Sciences ] journal & Dissertation

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