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.
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