Articles | Volume 21, issue 4
Research article
18 Apr 2017
Research article |  | 18 Apr 2017

Improving estimates of water resources in a semi-arid region by assimilating GRACE data into the PCR-GLOBWB hydrological model

Natthachet Tangdamrongsub, Susan C. Steele-Dunne, Brian C. Gunter, Pavel G. Ditmar, Edwin H. Sutanudjaja, Yu Sun, Ting Xia, and Zhongjing Wang


Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision
ED: Publish subject to minor revisions (further review by Editor) (15 Feb 2017) by Stefan Uhlenbrook
AR by Natthachet Tangdamrongsub on behalf of the Authors (24 Feb 2017)  Author's response    Manuscript
ED: Publish as is (16 Mar 2017) by Stefan Uhlenbrook
Short summary
This paper investigates the assimilation of terrestrial water storage variation estimates derived from GRACE data using an EnKF 3D approach. The spatially correlated errors in GRACE data derived from its full error variance–covariance matrices were taken into account. The experiments showed that GRACE DA improved the accuracy of groundwater storage estimates by as much as 25 % over the Hexi Corridor. The inclusion of error correlations provided an equal or greater improvement in the estimates.