Climate extremes can have many
negative effects on different sectors. Globally, observations show significant
changes in the characteristics of extreme events. We examined trends in extreme
temperature and precipitation indices in Iran during the period 1960-2014. We
present results from 33 quality controlled and homogenous synoptic stations
(excluding stations with excessive missing data). For each station, we
calculate 27 indices characterizing extreme temperature and precipitation. For
all indices (including Rx5DAY, CWD, R95p, R99p, GSL and TXn) positive,
negative, and insignificant trends were obtained. Generally, there were
negative trends in R10mm, R20mm, R25mm, CDD, PRCPTOT, FD, TN10p, TX10p, CSDI
and positive trends in Rx1DAY, SDII, SU25, TR20, TXx, TNn, TNx, TN90p, TX90p
and WSDI at most stations. There is a decreasing trend in the magnitude and
frequency of cold extremes and an increasing trend in magnitude and frequency
of warm extremes over the observational record, which is consistent with
previous research reporting the warming trends of the climate.
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