Trends in Extreme Precipitation Indices in Iran

1951-2007

Robert Balling, Mohammad Sadegh Keikhosravi Kiany, Shouraseni Sen Roy, Javad Khoshhal

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We investigate trends in extreme precipitation in Iran for 1951-2007 using the recently released APHRODITE daily rainfall time series. We find that seven different indices of extreme precipitation all show an upward trend through the study period. The seven different precipitation indices include annual precipitation total, number of days above a certain threshold, maximum precipitation received over a certain period of time, maximum one-day precipitation, and number of days with precipitation above the 90th percentile. A principal components analysis reveals one eigenvector explaining much of the variance in the seven indices and reveals that this component exhibits a strong upward trend for the whole of Iran. On a regional level, we find that the upward trend in extreme precipitation has a strong southwest-to-northeast gradient across the country for all the indices. We repeated all the analyses for 42 stations across the country to compare with the results from the gridded data; trends in extreme rainfall generated from the station data compare favorably with the results from the APHRODITE daily rainfall time series thereby reinforcing the robustness of our conclusions.

Original languageEnglish (US)
Article number2456809
JournalAdvances in Meteorology
Volume2016
DOIs
StatePublished - 2016

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Iran
Rain
trends
Time series
rainfall
Eigenvalues and eigenfunctions
Principal component analysis
time series
stations
principal component analysis
trend
index
principal components analysis
eigenvectors
gradients
thresholds

ASJC Scopus subject areas

  • Atmospheric Science
  • Geophysics
  • Pollution

Cite this

Trends in Extreme Precipitation Indices in Iran : 1951-2007. / Balling, Robert; Keikhosravi Kiany, Mohammad Sadegh; Sen Roy, Shouraseni; Khoshhal, Javad.

In: Advances in Meteorology, Vol. 2016, 2456809, 2016.

Research output: Contribution to journalArticle

Balling, Robert ; Keikhosravi Kiany, Mohammad Sadegh ; Sen Roy, Shouraseni ; Khoshhal, Javad. / Trends in Extreme Precipitation Indices in Iran : 1951-2007. In: Advances in Meteorology. 2016 ; Vol. 2016.
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