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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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HESS | Articles | Volume 24, issue 9
Hydrol. Earth Syst. Sci., 24, 4541–4565, 2020
https://doi.org/10.5194/hess-24-4541-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Hydrol. Earth Syst. Sci., 24, 4541–4565, 2020
https://doi.org/10.5194/hess-24-4541-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 21 Sep 2020

Research article | 21 Sep 2020

A universal Standardized Precipitation Index candidate distribution function for observations and simulations

Patrick Pieper et al.

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Status: closed
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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) (14 Jun 2020) by Marie-Claire ten Veldhuis
AR by Patrick Pieper on behalf of the Authors (15 Jun 2020)  Author's response    Manuscript
ED: Publish subject to minor revisions (review by editor) (27 Jun 2020) by Marie-Claire ten Veldhuis
AR by Patrick Pieper on behalf of the Authors (06 Jul 2020)  Author's response    Manuscript
ED: Publish as is (31 Jul 2020) by Marie-Claire ten Veldhuis
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Short summary
The Standardized Precipitation Index (SPI) is a widely accepted drought index. SPI normalizes the precipitation distribution via a probability density function (PDF). However, which PDF properly normalizes SPI is still disputed. We suggest using a previously mostly overlooked PDF, namely the exponentiated Weibull distribution. The proposed PDF ensures the normality of the index. We demonstrate this – for the first time – for all common accumulation periods in both observations and simulations.
The Standardized Precipitation Index (SPI) is a widely accepted drought index. SPI normalizes...
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