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

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

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

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

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

Quality Scope: dataset

Other: 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: 2020-03-13T14:33:38

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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