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Publicação
Spatial patterns and temporal variability of drought in Western Iran
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Orientador(es)
Resumo(s)
An analysis of drought in western Iran from 1966 to 2000 is presented
using monthly precipitation data observed at 140 gauges uniformly distributed over
the area. Drought conditions have been assessed by means of the Standardized
Precipitation Index (SPI). To study the long-term drought variability the principal
component analysis was applied to the SPI field computed on 12-month time scale.
The analysis shows that applying an orthogonal rotation to the first two principal
component patterns, two distinct sub-regions having different climatic variability
may be identified. Results have been compared to those obtained for the largescale
using re-analysis data suggesting a satisfactory agreement. Furthermore, the
extension of the large-scale analysis to a longer period (1948–2007) shows that
the spatial patterns and the associated time variability of drought are subjected
to noticeable changes. Finally, the relationship between hydrological droughts in
the two sub-regions and El Niño Southern Oscillation events has been investigated
finding that there is not clear evidence for a link between the two phenomena
Descrição
Palavras-chave
drought variability standardized precipitation index principal component analysis ENSO events
Contexto Educativo
Citação
"Water Resources Management". ISSN 0920-4741. 23 (2009) 439-455