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    On the use of satellite, gauge, and reanalysis precipitation products for drought studies


    Golian, Saeed and Javadian, Mostafa and Behrangi, Ali (2019) On the use of satellite, gauge, and reanalysis precipitation products for drought studies. Environmental Research Letters, 14 (075005). ISSN 1748-9326

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    Abstract

    Precipitation is a critical variable to monitor and predict meteorological drought. TheWMO recommended standardized precipitation index (SPI) is calculated from gauge (i.e. GPCC), satellitegauge (GPCP, CHIRPS), reanalysis (i.e. ERA-Interim, and MERRA-2), and satellite-gauge-reanalysis ( i.e.MSWEP) over the global domain. Measured differences among the precipitation datasets include metrics such as percent area under drought, number of drought events, spread and correlation in the number of drought events, and critical success index in capturing moderate and severe-exceptional droughts. As precipitation products are available at different lengths and spatial resolutions, sensitivity of drought metrics to record-length and spatial resolution were explored. The results suggest that precipitation-based drought metrics can vary significantly with the choice of precipitation product, its record-lengths, and spatial resolution. These relationships also vary with the severity of drought events with more severe drought events being more sensitive to the differences in resolution and record length. The quantified variation among the products has to be recognized in the interpretation of drought events when a single or a subset of products used.

    Item Type: Article
    Additional Information: Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Cite as: Saeed Golian et al 2019 Environ. Res. Lett. 14 075005
    Keywords: precipitation; drought; sensitivity analysis; record length; spatial resolution; satellite; reanalysis;
    Academic Unit: Faculty of Social Sciences > Research Institutes > Irish Climate Analysis and Research Units, ICARUS
    Item ID: 13663
    Identification Number: https://doi.org/10.1088/1748-9326/ab2203
    Depositing User: Saeed Golian
    Date Deposited: 25 Nov 2020 16:15
    Journal or Publication Title: Environmental Research Letters
    Publisher: IOP Publishing
    Refereed: Yes
    URI:

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