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| Titel |
A precipitation-based regionalization for Western Iran and regional drought variability |
| VerfasserIn |
T. Raziei, I. Bordi, L. S. Pereira |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 12, no. 6 ; Nr. 12, no. 6 (2008-12-10), S.1309-1321 |
| Datensatznummer |
250010959
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| Publikation (Nr.) |
 copernicus.org/hess-12-1309-2008.pdf |
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| Zusammenfassung |
The spatial distribution of the seasonal and annual precipitation was
analyzed in western Iran using data from 140 stations covering the period
1965–2000. Applying the Precipitation Concentration Index (PCI), the
intra-annual precipitation variability was also studied. Furthermore, nine
precipitation-derived parameters were used to regionalize climate in western
Iran using principal component analysis and clustering techniques. Results
suggest that five spatially homogenous sub-regions can be identified
characterized by different precipitation regimes. The spatial pattern of
seasonal precipitation seems to be highly controlled by the wide latitudinal
extent of the region and by the pronounced orographic relieves, and the time
of occurrence of the maximum precipitation varies from spring in the north to
winter in the south.
The time variability of dry and wet periods in the identified sub-regions was
analyzed using the Precipitation Index (PI) and the existence of any
long-term trend was tested. Results show that the northern and southern
regions of western Iran are characterized by different climatic variability.
Furthermore, a negative long-term linear trend in the north and a weak
positive trend in the south of the study area have been detected though they
are not statistically significant. |
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