Articles | Volume 24, issue 1
Hydrol. Earth Syst. Sci., 24, 227–248, 2020
https://doi.org/10.5194/hess-24-227-2020
Hydrol. Earth Syst. Sci., 24, 227–248, 2020
https://doi.org/10.5194/hess-24-227-2020

Research article 16 Jan 2020

Research article | 16 Jan 2020

A framework for deriving drought indicators from the Gravity Recovery and Climate Experiment (GRACE)

Helena Gerdener et al.

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AR: Author's response | RR: Referee report | ED: Editor decision
ED: Reconsider after major revisions (further review by editor and referees) (09 Oct 2019) by Bettina Schaefli
AR by Helena Gerdener on behalf of the Authors (16 Oct 2019)  Author's response    Manuscript
ED: Referee Nomination & Report Request started (23 Oct 2019) by Bettina Schaefli
RR by Anonymous Referee #1 (26 Nov 2019)
ED: Publish as is (10 Dec 2019) by Bettina Schaefli
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Short summary
GRACE-derived drought indicators enable us to detect hydrological droughts based on changes observed in all storages. By performing synthetic experiments, we find that droughts identified by existing and modified indicators are biased by trends and GRACE-based spatial noise. A modified version of the Zhao et al. (2017) indicator is found to be particularly robust against spatial noise and is therefore applied to real GRACE data over South Africa.