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Standardised Precipitation Index time series for Integrated Hydrological Units Groups (1961-2012)

Standardised Precipitation Index (SPI) data for Integrated Hydrological Units (IHU) groups (Kral et al. [1]). SPI is a drought index based on the probability of precipitation for a given accumulation period as defined by McKee et al. [2]. SPI 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 gamma 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 doi:10.5285/f1cd5e33-2633-4304-bbc2-b8d34711d902 [2] McKee, T. B., Doesken, N. J., Kleist, J. (1993). The Relationship of Drought Frequency and Duration to Time Scales. Eighth Conference on Applied Climatology, 17-22 January 1993, Anaheim, California. Full details about this dataset can be found at https://doi.org/10.5285/dfd59438-2170-4472-b810-bab33a83d09f

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Identification info

Metadata Language
English (en)
Character set
utf8
Dataset Reference Date ()
2015-05-22
Dataset Reference Date ()
2015-05-14
Identifier
CEH:EIDC: / 1432105852978
Identifier
https://catalogue.ceh.ac.uk/id/dfd59438-2170-4472-b810-bab33a83d09f
Identifier
doi: / 10.5285/dfd59438-2170-4472-b810-bab33a83d09f
Other citation details
Tanguy, M., Kral., F., Fry, M., Svensson, C., Hannaford, J. (2015). Standardised Precipitation Index time series for Integrated Hydrological Units Groups (1961-2012). NERC Environmental Information Data Centre 10.5285/dfd59438-2170-4472-b810-bab33a83d09f
  UK Centre for Ecology & Hydrology - Dr Maliko Tanguy
  Centre for Ecology & Hydrology - Tanguy, M.
  Centre for Ecology & Hydrology - Kral., F.
  Centre for Ecology & Hydrology - Fry, M.
  Centre for Ecology & Hydrology - Svensson, C.
  Centre for Ecology & Hydrology - Hannaford, J.
  NERC Environmental Information Data Centre
  NERC EDS Environmental Information Data Centre
Maintenance and update frequency
notPlanned
GEMET - INSPIRE themes, version 1.0 ()
  • Meteorological geographical features
Keywords
  • SPI
  • indicator
  • accumulation period
  • Integrated Hydrological Units
  • IHU
  • drought
  • rainfall extremes
Limitations on Public Access
otherRestrictions
Other constraints
no limitations
Use constraints
otherRestrictions
Other constraints
Licence terms and conditions apply
Use constraints
otherRestrictions
Other constraints
If you reuse this data, you should cite: Tanguy, M., Kral., F., Fry, M., Svensson, C., Hannaford, J. (2015). Standardised Precipitation Index time series for Integrated Hydrological Units Groups (1961-2012). NERC Environmental Information Data Centre https://doi.org/10.5285/dfd59438-2170-4472-b810-bab33a83d09f
Spatial representation type
textTable
Distance
1000  urn:ogc:def:uom:EPSG::9001
Topic category
  • Climatology, meteorology, atmosphere
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Begin date
1961-01-01
End date
2012-12-31
 
Code
OSGB 1936 / British National Grid

Distribution Information

Data format
  • Comma-separated values (CSV) ()

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Supporting information

Supporting information available to assist in re-use of this dataset.

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Supporting information

Supporting information available to assist in re-use of this dataset.

 
Quality Scope
dataset
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dataset

Report

Dataset Reference Date ()
2010-12-08
Statement
SPI is calculated as originally defined in McKee et al. [1]. SPI is based on the cumulative probability of a given rainfall amount occurring at a location. The historic rainfall data of the station is fitted to a statistical distribution. For this dataset, the statistical distribution used is the gamma distribution, which has been extensively used and is recommended as a default choice for Europe by Stagge et al. [2]. The L-moments method was used to estimate the gamma distribution parameters, as the maximum likehood method was failing to fit a realistic distribution in some isolated cases (more details on the choice of methodology in Tanguy et al. [3]). To calculate SPI, the R package SCI was used (Gudmundsson & Stagge [4]), but modified to use L-moments (instead of Maximum Likelihood). The input data used is the monthly rainfall grids from CEH-Gridded Estimates of Areal Rainfall [CEH-GEAR] (Tanguy et al. [5], Keller et al. [6]) which has been area-averaged over each of the Integrated Hydrological Units (IHU) groups(Kral et al. [7]). [1] McKee, T. B., Doesken, N. J., Kleist, J. (1993). The Relationship of Drought Frequency and Duration to Time Scales. Eighth Conference on Applied Climatology, 17-22 January 1993, Anaheim, California. [2] Stagge, J. H., Tallaksen, L. M., Gudmundsson, L., Van Loon, A. F. and Stahl, K. (2015), Candidate Distributions for Climatological Drought Indices (SPI and SPEI). Int. J. Climatol. doi: 10.1002/joc.4267 [3] Tanguy et al. (2015), in preparation. [4] 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 [5] 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 doi:10.5285/5dc179dc-f692-49ba-9326-a6893a503f6e [6] 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, www.earth-syst-sci-data-discuss.net/8/83/2015/ doi:10.5194/essdd-8-83-2015. [7] Kral, F., Fry, M., Dixon, H. (2015). Integrated Hydrological Units of the United Kingdom: Groups. NERC-Environmental Information Data Centre doi:10.5285/f1cd5e33-2633-4304-bbc2-b8d34711d902

Metadata

File identifier
dfd59438-2170-4472-b810-bab33a83d09f XML
Metadata Language
English (en)
Character set
ISO/IEC 8859-1 (also known as Latin 1)
Resource type
dataset
Hierarchy level name
dataset
Metadata Date
2021-06-25T18:37:58
Metadata standard name
UK GEMINI
Metadata standard version
2.3
  Environmental Information Data Centre
Lancaster Environment Centre, Library Avenue, Bailrigg , Lancaster , LA1 4AP , UK
 
 

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