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| Titel |
Development of a Combined Drought Indicator to detect agricultural drought in Europe |
| VerfasserIn |
G. Sepulcre-Cantò, S. Horion, A. Singleton, H. Carrao, J. Vogt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 12, no. 11 ; Nr. 12, no. 11 (2012-11-29), S.3519-3531 |
| Datensatznummer |
250011207
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| Publikation (Nr.) |
 copernicus.org/nhess-12-3519-2012.pdf |
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| Zusammenfassung |
This study proposes a drought indicator that combines the Standardized
Precipitation Index (SPI), the anomalies of soil moisture and the anomalies
of the fraction of Absorbed Photosynthetically Active Radiation (fAPAR).
Computed at the European level, the Combined Drought Indicator (CDI) gives a
synthetic and synoptic overview of the drought situation using a
classification scheme. Derived from the integration of the three individual
indices, this classification scheme is composed of three warning levels:
"watch" when a relevant precipitation shortage is observed, "warning"
when this precipitation shortage translates into a soil moisture anomaly, and
"alert" when these two conditions are accompanied by an anomaly in the
vegetation condition.
The design of the CDI includes the study of the relationship between the
three individual indices. To achieve this, the SPI-3 (3-month SPI) was computed using the
precipitation data obtained from a set of weather stations located in
different agricultural areas of Europe, while the soil moisture and fAPAR
data were extracted from the pixels of the respective grids surrounding
these stations.
The CDI is assessed for the main drought episodes of Europe between 2000 and
2011, using reported data from different sources, such as the EM-DAT
Emergency Events Database and Eurostat annual yield estimates. The
capability of the CDI to serve for drought early warning is evaluated as
well as its robustness against false alarms.
The indicator has been spatially implemented for the entire continent using
different information layers of the European Drought Observatory. These
layers correspond to SPI-3 grids derived from interpolated weather station
precipitation data, anomalies of fAPAR from the MERIS Global Vegetation
Index and anomalies of soil moisture obtained using the LISFLOOD distributed
hydrological model. Maps of the CDI obtained for the European drought event
in spring 2011 are shown and discussed, evaluating its operational
applicability. To conclude, the main limitations of the indicator are
presented and possible avenues for improvement are discussed. |
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