INTERNATIONAL JOURNAL OF CLIMATOLOGY, vol.29, no.15, pp.2270-2282, 2009 (SCI-Expanded)
Article / Article
INTERNATIONAL JOURNAL OF CLIMATOLOGY
Science Citation Index Expanded (SCI-EXPANDED), Scopus
Turkey, climate variability, precipitation, drought, Standardized Precipitation Index (SPI), local-time means, drought probability, drought monitoring, NORTH-ATLANTIC OSCILLATION, EMPIRICAL MODE DECOMPOSITION, RAINFALL VARIATIONS, VARIABILITY, SURFACE, SERIES
Çanakkale Onsekiz Mart University Affiliated:
This paper suggests a new methodology for the Standardized Precipitation Index (SPI), for studying different aspects of drought events in Turkey, including intensity, frequency and identifying the spatial and temporal patterns. The classical SPI is locally defined; for instance, for monthly scale or running means, a drought event would begin when the precipitation amount is below its long-term average. However, the proposed method considers the local-time means of the precipitation series by fitting an upper and a lower envelope to precipitation data to obtain the SPI values, thus it explicitly assesses a dry (or wet) spell of weather.