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A monthly global dataset of a multiscalar drought index is presented and compared in terms of spatial and temporal variability with the existing continental and global drought datasets based on the Palmer\ud drought severity index (PDSI). The presented dataset is based on the standardized precipitation\udevapotranspiration index (SPEI). The index was obtained using the CRU TS3.0 dataset at a spatial resolution\udof 0.5°. The advantages of the new dataset are that; i) it improves the spatial resolution of the unique global\uddrought dataset at a global scale; ii) it is spatially and temporally comparable to other datasets, given the\udprobabilistic nature of the SPEI, and, in particular; iii) it enables identification of various drought types,\udgiven the multiscalar character of the SPEI. The dataset is freely available on the web page of the Spanish\udNational Research Council (CSIC) in three different formats (NetCDF, binary raster, and plain text).This work has been supported by the research projects CGL2008-01189/BTE and CGL2006-11619/HID\udfinanced by the Spanish Commission of Science and Technology and FEDER, EUROGEOSS (FP7-ENV-\ud 2008-1-226487) and ACQWA (FP7-ENV-2007-1- 212250) financed by the VII Framework Programme of\udthe European Commission, “Las sequías climáticas en la cuenca del Ebro y su respuesta hidrológica” and “La nieve en el Pirineo aragonés: Distribución espacial y su respuesta a las condiciones climática” Financed by\ud“Obra Social La Caixa” and the Aragón GovernmentPeer reviewe

journal of hydrometeorology

A New Global 0.5° Gridded Dataset (1901–2006) of a Multiscalar Drought Index: Comparison with Current Drought Index Datasets Based on the Palmer Drought Severity Index