Description
The 3-month Standardized Precipitation Index (SPI-3) is a meteorological drought indicator to monitor precipitation anomalies over 3-month accumulation periods and is a proxy indicator for immediate impacts of droughts, such as reduced soil moisture, snowpack, and flow in smaller creeks, and for medium-term impacts, for example reduced stream flow and reservoir storage. This indicator has a temporal resolution of 1 month and is derived from daily rainfall observations at SYNOP (Surface Synoptic Observations) stations from the MARS database (https://ec.europa.eu/jrc/en/mars) interpolated at 0.25 decimal degrees, and blended with Global Precipitation Climatology Centre (GPCC - http://gpcc.dwd.de/) monthly total precipitation at 1 decimal degree. Interpolation at 0.25 decimal degree
resolution and blending with GPCC data are according to Barnes iterative correction objective analysis (Koch, S. E., M. DesJardins, and P. J. Kocin, 1983: An interactive Barnes objective map analysis scheme for use with satellite and conventional data. J. Climate Appl. Meteor.,22, 1487–1503.). The SPI represents precipitation anomalies at a given location and time, as the deviation from the long-term mean in a standard normal distribution, with more negative values representing a more severe drought. SPI is calculated by comparing the observed total precipitation amounts for an accumulation period of a number of months, indicated by a number following SPI-3, with the long-term “climatological” rainfall distribution for that same period of the year, derived from historical rainfall records in a specific reference period. A given accumulation period corresponds to different potential impacts of drought, with shorter accumulation periods generally representing fast-changing aspects of the water system such as surface soil moisture and flow in small rivers, and longer accumulation periods representing slower changing aspects of the water system such as groundwater and baseflow in larger rivers. However, the exact relationship between accumulation period and impacts depends on the natural environment (e.g. geology, soils) and human interference (e.g. irrigation). Details on the calculation of the SPI and blending and interpolation procedures are given in the indicator factsheet.
Contact
Contributors
-
- European Drought Observatory, EDO
How to cite
European Commission, Joint Research Centre (JRC) (2021): EDO Standardized Precipitation Index, 3-month accumulation period (SPI-3), blended and interpolated (version 1.2.0). European Commission, Joint Research Centre (JRC) [Dataset] PID: http://data.europa.eu/89h/0ae4cbf0-55f1-4aee-b1ae-a5317b264072
Keywords
CEMS Copernicus Drought European Drought Observatory (EDO) Precipitation SPI Precipitation Anomaly
Data access
Factsheet
Publications
Geographic areas
Spatial coverage
Type | Value |
---|---|
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WKT | POLYGON ((-41 76, 76 76, 76 25, -41 25, -41 76)) |
Temporal coverage
From date | To date |
---|---|
1981-01-01 | N/A |
Additional information
- Published by
- European Commission, Joint Research Centre
- Created date
- 2021-04-30
- Modified date
- 2021-07-21
- Issued date
- 2021-04-30
- Landing page
- https://edo.jrc.ec.europa.eu/
- Language(s)
- English
- Data theme(s)
- Environment
- Update frequency
- monthly
- Identifier
- http://data.europa.eu/89h/0ae4cbf0-55f1-4aee-b1ae-a5317b264072
- Popularity
-