9b550cc5-4cba-45fb-ab92-8408454fa1d4 English ISO/IEC 8859-1 (also known as Latin 1) dataset dataset NERC EDS Environmental Information Data Centre Lancaster Environment Centre, Library Avenue, Bailrigg Lancaster LA1 4AP UK info@eidc.ac.uk https://eidc.ac.uk/ EIDC website The Environmental Information Data Centre (EIDC) is the UK's national data centre for terrestrial and freshwater sciences. information pointOfContact 2026-02-06T12:47:42 UK GEMINI 2.3 OSGB 1936 / British National Grid Standardised Precipitation Evapotranspiration Index time series for Integrated Hydrological Units Groups (1961-2012) 2015-09-30 publication 2015-09-30 creation https://catalogue.ceh.ac.uk/id/9b550cc5-4cba-45fb-ab92-8408454fa1d4 10.5285/9b550cc5-4cba-45fb-ab92-8408454fa1d4 doi: Tanguy, M., Kral, F., Fry, M., Svensson, C., Hannaford, J. (2015). Standardised Precipitation Evapotranspiration Index time series for Integrated Hydrological Units Groups (1961-2012). NERC Environmental Information Data Centre 10.5285/9b550cc5-4cba-45fb-ab92-8408454fa1d4 Standardised Precipitation Evapotranspiration Index (SPEI) data for Integrated Hydrological Units (IHU) groups (Kral et al. [1]). SPEI is a drought index based on the probability of occurrence of the Climatic Water Balance (CWB) - which is equivalent to the amount of precipitation minus the amount of evapotranspiration - for a given accumulation period as defined by Vicente-Serrano et al. [2]. SPEI is calculated for different accumulation periods: 1, 3, 6, 12, 18, 24 months. Each of these is in turn calculated for each of the twelve calendar months. Note that values in monthly (and for longer accumulation periods also annual) time series of the data therefore are likely to be autocorrelated. The standard period which was used to fit the general logistic distribution is 1961-2010. The dataset covers the period from 1961 to 2012. [1] Kral, F., Fry, M., Dixon, H. (2015). Integrated Hydrological Units of the United Kingdom: Groups. NERC-Environmental Information Data Centre https://doi.org/10.5285/f1cd5e33-2633-4304-bbc2-b8d34711d902 [2] Vicente-Serrano, S. M., Beguería, S., López-Moreno, J. I. (2010) A Multiscalar Drought Index Sensitive to Global Warming: The Standardized Precipitation Evapotranspiration Index. J. Climate, 23, 1696 to 1718. https://doi.org/10.1175/2009JCLI2909.1 Full details about this dataset can be found at https://doi.org/10.5285/9b550cc5-4cba-45fb-ab92-8408454fa1d4 Tanguy, M. UK Centre for Ecology & Hydrology enquiries@ceh.ac.uk pointOfContact Tanguy, M. Centre for Ecology & Hydrology enquiries@ceh.ac.uk originator Tanguy, M. Centre for Ecology & Hydrology enquiries@ceh.ac.uk author Kral, F. Centre for Ecology & Hydrology enquiries@ceh.ac.uk author Fry, M. Centre for Ecology & Hydrology enquiries@ceh.ac.uk author Svensson, C. Centre for Ecology & Hydrology enquiries@ceh.ac.uk author Hannaford, J. Centre for Ecology & Hydrology enquiries@ceh.ac.uk author NERC Environmental Information Data Centre info@eidc.ac.uk publisher NERC EDS Environmental Information Data Centre info@eidc.ac.uk custodian notPlanned Meteorological geographical features theme GEMET - INSPIRE themes, version 1.0 2008-06-01 publication drought GEMET - Concepts, version 4.1.3 2019-01-28 creation Hydrology SPEI indicator accumulation period Integrated Hydrological Units IHU rainfall extremes climatic water balance otherRestrictions Registration is required to access this data otherRestrictions Licence terms and conditions apply otherRestrictions If you reuse this data, you should cite: Tanguy, M., Kral, F., Fry, M., Svensson, C., Hannaford, J. (2015). Standardised Precipitation Evapotranspiration Index time series for Integrated Hydrological Units Groups (1961-2012). NERC Environmental Information Data Centre https://doi.org/10.5285/9b550cc5-4cba-45fb-ab92-8408454fa1d4 textTable English utf8 climatologyMeteorologyAtmosphere 1961-01-01 2012-12-31 -7.557 3.554 49.766 61.026 Comma-separated values (CSV) NERC EDS Environmental Information Data Centre info@eidc.ac.uk distributor https://data-package.ceh.ac.uk/data/9b550cc5-4cba-45fb-ab92-8408454fa1d4 Download the data Download a copy of this data download https://data-package.ceh.ac.uk/sd/9b550cc5-4cba-45fb-ab92-8408454fa1d4.zip Supporting information Supporting information available to assist in re-use of this dataset information dataset dataset Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 SPEI is calculated as originally defined in Vicente-Serrano et al. [1]. SPEI is based on the cumulative probability of a given Climatic Water Balance (CWB) - which is equivalent to the amount of precipitation minus the amount of evapotranspiration - occurring at a location. The historic CWB data of the station is fitted to a statistical distribution. For this dataset, the statistical distribution used is the generalised logistic distribution. The maximum likelihood method was used to estimate the generalised logistic distribution parameters. To calculate SPEI, the R package SCI was used (Gudmundsson & Stagge [2]). The input data used is the monthly rainfall grids from CEH-Gridded Estimates of Areal Rainfall [CEH-GEAR] (Tanguy et al. [3], Keller et al. [4]) and CHESS potential evapotranspiration dataset (Robinson et al. [5], [6]) which have been area-averaged over each of the Integrated Hydrological Units (IHU) groups(Kral et al. [7]). [1] Vicente-Serrano, S. M., Beguería, S., López-Moreno, J. I. (2010) A Multiscalar Drought Index Sensitive to Global Warming: The Standardized Precipitation Evapotranspiration Index. J. Climate, 23, 1696-1718. https://doi.org/10.1175/2009JCLI2909.1 [2] Gudmundsson, L. & Stagge, J. H. (2014). Package 'SCI': Standardized Climate Indices such as SPI, SRI or SPEI. Repository CRAN, http://cran.r-project.org/web/packages/SCI/SCI.pdf [3] Tanguy, M., Dixon, H., Prosdocimi, I., Morris, D. G., Keller, V. D. J. (2014). Gridded estimates of daily and monthly areal rainfall for the United Kingdom (1890-2012) [CEH-GEAR]. NERC-Environmental Information Data Centre https://doi.org/10.5285/5dc179dc-f692-49ba-9326-a6893a503f6e [4] Keller, V. D. J., Tanguy, M. , Prosdocimi, I. , Terry, J. A. , Hitt, O., Cole, S. J. , Fry, M., Morris, D. G., Dixon, H. (2015) CEH-GEAR: 1km resolution daily and monthly areal rainfall estimates for the UK for hydrological use. Earth Syst. Sci. Data Discuss., 8, 83-112 https://doi.org/10.5194/essdd-8-83-2015 [5] Robinson, E. L., Blyth, E., Clark, D. B., Finch, J., Rudd, A. C. (in preparation), Trends in evaporative demand in Great Britain using high-resolution meteorological data [6] Robinson, E. L., Blyth, E., Clark, D. B., Finch, J., Rudd, A. C. (2015). Climate hydrology and ecology research support system potential evapotranspiration dataset for Great Britain (1961-2012) [CHESS-PE]. NERC-Environmental Information Data Centre [7] Kral, F., Fry, M., Dixon, H. (2015). Integrated Hydrological Units of the United Kingdom: Groups. NERC-Environmental Information Data Centre https://doi.org/10.5285/f1cd5e33-2633-4304-bbc2-b8d34711d902