open access

https://hdl.handle.net/2115/44791

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

英語

Hydrology

2011-02

the Royal Astronomical Society and Blackwell Publishing

Geophysical Journal International

184(2)

673-679

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.

学術雑誌論文

Version of Record

The definitive version is available at www.blackwell-synergy.com

0956-540X

1365-246X

AA10717798