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| Titel |
Spatial and temporal variability of precipitation and drought in Portugal |
| VerfasserIn |
D. S. Martins, T. Raziei, A. A. Paulo, L. S. Pereira |
| 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. 5 ; Nr. 12, no. 5 (2012-05-16), S.1493-1501 |
| Datensatznummer |
250010816
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| Publikation (Nr.) |
 copernicus.org/nhess-12-1493-2012.pdf |
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| Zusammenfassung |
| The spatial variability of precipitation and drought are investigated for
Portugal using monthly precipitation from 74 stations and minimum and
maximum temperature from 27 stations, covering the common period of
1941–2006. Seasonal precipitation and the corresponding percentages in the
year, as well as the precipitation concentration index (PCI), was computed
for all 74 stations and then used as an input matrix for an R-mode principal
component analysis to identify the precipitation patterns. The standardized
precipitation index at 3 and 12 month time scales were computed for all
stations, whereas the Palmer Drought Severity Index (PDSI) and the modified
PDSI for Mediterranean conditions (MedPDSI) were computed for the stations
with temperature data. The spatial patterns of drought over Portugal were
identified by applying the S-mode principal component analysis coupled with
varimax rotation to the drought indices matrices. The result revealed two
distinct sub-regions in the country relative to both precipitation regimes
and drought variability. The analysis of time variability of the PC scores
of all drought indices allowed verifying that there is no linear trend
indicating drought aggravation or decrease. In addition, the analysis shows
that results for SPI-3, SPI-12, PDSI and MedPDSI are coherent among them. |
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