Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/5957
Título: Spatial patterns and temporal variability of drought in Western Iran
Autor: Raziei, Tayeb
Saghafian, Bahram
Paulo, Ana A.
Pereira, L.S.
Bordi, Isabella
Palavras-chave: drought variability
standardized precipitation index
principal component analysis
ENSO events
Data: 2009
Editora: Springer
Citação: "Water Resources Management". ISSN 0920-4741. 23 (2009) 439-455
Resumo: 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
Peer review: yes
URI: http://hdl.handle.net/10400.5/5957
ISSN: 0920-4741
Versão do Editor: DOI 10.1007/s11269-008-9282-4
Aparece nas colecções:DER - Artigos de Revistas

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