Articles | Volume 24, issue 9
Hydrol. Earth Syst. Sci., 24, 4541–4565, 2020
https://doi.org/10.5194/hess-24-4541-2020
Hydrol. Earth Syst. Sci., 24, 4541–4565, 2020
https://doi.org/10.5194/hess-24-4541-2020

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.

Download

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

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
Download
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.