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SPEIbase v.2.2 [Dataset]

AuthorsBeguería, Santiago ; Vicente Serrano, Sergio M.
Drought Index
Standardized Precipitation-Evapotranspiration Index
Global Warming
Climate change
Climate data
Global data
Issue Date15-Mar-2013
CitationBeguería, Santiago ; Vicente Serrano, Sergio M.; 2013; SPEIbase v.2.2 [Dataset], DIGITAL.CSIC.; http://dx.doi.org/10.20350/digitalCSIC/6540
AbstractGlobal gridded dataset of the Standardized Precipitation-Evapotranspiration Index (SPEI) at time scales between 1 and 48 months. Spatial resolution of 0.5º lat/lon. Temporal coverage between January 1901 and December 2011. This is an update of a previous version of SPEIbase v2 (http://hdl.handle.net/10261/48169). What’s new in version 2.2: 1) Data has been extended to the period 1901-2011 (it was 1901-2009 in v 2.0). 2) The FAO grass reference evapotranspiration from the CRU TS3.2 dataset has been used as PET input for the SPEI (http://badc.nerc.ac.uk/browse/badc/cru/data/cru_ts_3.20). Precipitation is also obtained from the same CRU TS3.2 dataset. 3) Unbiased probability weighted moments (ub-pwm) method has been used for fitting the log-Logistic distribution, instead of the sub-optimal plotting-position pwm method used in version 1.0. For more details on the SPEI visit http://sac.csic.es/spei.
DescriptionThe Global 0.5° gridded SPEI dataset is made available under the Open Database License. Any rights in individual contents of the database are licensed under the Database Contents License. Users of the dataset are free to share, create and adapt under the conditions of attribution and share-alike.
Use of the newest version is recommended. Older versions are still available to allow replicability.
The Global SPEI database, SPEIbase, offers long-time, robust information on the drought conditions at the global scale, with a 0.5 degrees spatial resolution and a monthly time resolution. It has a multi-scale character, providing SPEI time-scales between 1 and 48 months. The Standardized Precipitatin-Evapotranspiration Index (SPEI) expresses, as a standardized variate (mean zero and unit variance), the deviations of the current climatic balance (precipitation minus evapotranspiration potential) with respect to the long-term balance. The reference period for the calculation, in the SPEIbase, corresponds to the whole study period. Being a standardized variate means that the SPEI condition can be compared across space and time. Calculation of the evapotranspiration potential in SPEIbase is based on the FAO-56 Penman-Monteith method. Data type: float; units: z-values (standard deviations). No land pixels are assigned a value of 1.0x10^30. In some rare cases it was not possible to achieve a good fit to the log-logistic distribution, resulting in a NAN (not a number) value in the database. Dimensions of the dataset: lon = 720; lat = 360; time = 1356. Resolution of the dataset: lon = 0.5º; lat = 0.5º; time = 1 month. Created in R using the SPEI package (http://cran.r-project.org/web/packages/SPEI).
Publisher version (URL)http://sac.csic.es/spei/
ReferencesVicente-Serrano S.M., Beguería S., López-Moreno J.I. A Multi-scalar drought index sensitive to global warming: The Standardized Precipitation Evapotranspiration Index. http://dx.doi.org/10.1175/2009JCLI2909.1.-- http://digital.csic.es/handle/10261/22405.
Vicente-Serrano S.M., Beguería S., López-Moreno J.I., Angulo M., El Kenawy A. A global 0.5° gridded dataset (1901-2006) of a multiscalar drought index considering the joint effects of precipitation and temperature. http://dx.doi.org/10.1175/2010JHM1224.1. http://digital.csic.es/handle/10261/23906.
Beguería S., Vicente-Serrano S.M., Angulo M. A multi-scalar global drought data set: the SPEIbase. http://dx.doi.org/10.1175/2010BAMS2988.1. http://digital.csic.es/handle/10261/29993.
Appears in Collections:(EEAD) Conjuntos de datos
(IPE) Conjuntos de datos
Files in This Item:
File Description SizeFormat 
SPEI_01.ncGlobal 01-month 1901-2011 SPEI311,82 MBNetCDF fileView/Open
SPEI_02.ncGlobal 02-month 1901-2011 SPEI311,32 MBNetCDF fileView/Open
SPEI_03.ncGlobal 03-month 1901-2011 SPEI311,06 MBNetCDF fileView/Open
SPEI_04.ncGlobal 04-month 1901-2011 SPEI310,82 MBNetCDF fileView/Open
SPEI_05.ncGlobal 05-month 1901-2011 SPEI310,12 MBNetCDF fileView/Open
SPEI_06.ncGlobal 06-month 1901-2011 SPEI309,56 MBNetCDF fileView/Open
SPEI_07.ncGlobal 07-month 1901-2011 SPEI309,38 MBNetCDF fileView/Open
SPEI_08.ncGlobal 08-month 1901-2011 SPEI309,06 MBNetCDF fileView/Open
SPEI_09.ncGlobal 09-month 1901-2011 SPEI308,72 MBNetCDF fileView/Open
SPEI_10.ncGlobal 10-month 1901-2011 SPEI308,72 MBNetCDF fileView/Open
SPEI_11.ncGlobal 11-month 1901-2011 SPEI308,36 MBNetCDF fileView/Open
SPEI_12.ncGlobal 12-month 1901-2011 SPEI307,6 MBNetCDF fileView/Open
SPEI_13.ncGlobal 13-month 1901-2011 SPEI307,72 MBNetCDF fileView/Open
SPEI_14.ncGlobal 14-month 1901-2011 SPEI307,05 MBNetCDF fileView/Open
SPEI_15.ncGlobal 15-month 1901-2011 SPEI306,73 MBNetCDF fileView/Open
SPEI_16.ncGlobal 16-month 1901-2011 SPEI306,83 MBNetCDF fileView/Open
SPEI_17.ncGlobal 17-month 1901-2011 SPEI306,34 MBNetCDF fileView/Open
SPEI_18.ncGlobal 18-month 1901-2011 SPEI306,29 MBNetCDF fileView/Open
SPEI_19.ncGlobal 19-month 1901-2011 SPEI305,97 MBNetCDF fileView/Open
SPEI_20.ncGlobal 20-month 1901-2011 SPEI306,07 MBNetCDF fileView/Open
SPEI_21.ncGlobal 21-month 1901-2011 SPEI305,69 MBNetCDF fileView/Open
SPEI_22.ncGlobal 22-month 1901-2011 SPEI305,21 MBNetCDF fileView/Open
SPEI_23.ncGlobal 23-month 1901-2011 SPEI304,71 MBNetCDF fileView/Open
SPEI_24.ncGlobal 24-month 1901-2011 SPEI304,43 MBNetCDF fileView/Open
SPEI_25.ncGlobal 25-month 1901-2011 SPEI304,48 MBNetCDF fileView/Open
SPEI_26.ncGlobal 26-month 1901-2011 SPEI303,99 MBNetCDF fileView/Open
SPEI_27.ncGlobal 27-month 1901-2011 SPEI303,83 MBNetCDF fileView/Open
SPEI_28.ncGlobal 28-month 1901-2011 SPEI303,49 MBNetCDF fileView/Open
SPEI_29.ncGlobal 29-month 1901-2011 SPEI303,46 MBNetCDF fileView/Open
SPEI_30.ncGlobal 30-month 1901-2011 SPEI303,5 MBNetCDF fileView/Open
SPEI_31.ncGlobal 31-month 1901-2011 SPEI303,07 MBNetCDF fileView/Open
SPEI_32.ncGlobal 32-month 1901-2011 SPEI302,82 MBNetCDF fileView/Open
SPEI_33.ncGlobal 33-month 1901-2011 SPEI302,27 MBNetCDF fileView/Open
SPEI_34.ncGlobal 34-month 1901-2011 SPEI302,49 MBNetCDF fileView/Open
SPEI_35.ncGlobal 35-month 1901-2011 SPEI302 MBNetCDF fileView/Open
SPEI_36.ncGlobal 36-month 1901-2011 SPEI301,62 MBNetCDF fileView/Open
SPEI_37.ncGlobal 37-month 1901-2011 SPEI301,51 MBNetCDF fileView/Open
SPEI_38.ncGlobal 38-month 1901-2011 SPEI301,27 MBNetCDF fileView/Open
SPEI_39.ncGlobal 39-month 1901-2011 SPEI300,98 MBNetCDF fileView/Open
SPEI_40.ncGlobal 40-month 1901-2011 SPEI301,15 MBNetCDF fileView/Open
SPEI_41.ncGlobal 41-month 1901-2011 SPEI300,45 MBNetCDF fileView/Open
SPEI_42.ncGlobal 42-month 1901-2011 SPEI300,45 MBNetCDF fileView/Open
SPEI_43.ncGlobal 43-month 1901-2011 SPEI300,11 MBNetCDF fileView/Open
SPEI_44.ncGlobal 44-month 1901-2011 SPEI299,59 MBNetCDF fileView/Open
SPEI_45.ncGlobal 45-month 1901-2011 SPEI299,7 MBNetCDF fileView/Open
SPEI_46.ncGlobal 46-month 1901-2011 SPEI299,27 MBNetCDF fileView/Open
SPEI_47.ncGlobal 47-month 1901-2011 SPEI299,08 MBNetCDF fileView/Open
SPEI_48.ncGlobal 48-month 1901-2011 SPEI298,71 MBNetCDF fileView/Open
readme.txtNotes2,22 kBTextView/Open
file_list.txtList of all files comprising the SPEIbase2,94 kBTextView/Open
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