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A. G. Dai, K. E. Trenberth and T. R. Karl, “Global Variations in Droughts and Wet Spells: 1900-1995,” Geophysical Research Letters, Vol. 25, No. 17, 1998, pp. 3367-3370. doi:10.1029/98GL52511

has been cited by the following article:

• TITLE: Evaluation of Spatial-Temporal Variability of Drought Events in Iran Using Palmer Drought Severity Index and Its Principal Factors (through 1951-2005)

  AUTHORS: Mojtaba Zoljoodi, Ali Didevarasl

  KEYWORDS: Intensity and Variability of Droughts; Palmer Drought Severity Index (PDSI); Basic Statistical Approaches; La Nina; Iran

  JOURNAL NAME: Atmospheric and Climate Sciences, Vol.3 No.2, April 30, 2013

  ABSTRACT: Intensity and variability of droughts are considered inIranduring the period 1951 to 2005. Four variables are considered: the Palmer Drought Severity Index (PDSI), the soil moisture, the temperature and the precipitation (products used for the analysis are downloaded from the NCAR website). Link with the climatic indexLa Ninais also considered (NOAA downloadable products is used). The analysis is based on basic statistical approaches (correlation, linear regressions and Principal Component Analysis). The analysis shows that PDSI is highly correlated to the soil moisture and poorly correlated to the other variables—although the temperature in the warm season shows high correlation to the PDSI and that a severe drought was experienced during 1999-2002 inthe country.