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:: Volume 27, Issue 2 (2012) ::
geores 2012, 27(2): 1-18 Back to browse issues page
Principle Component Analysis of Extreme Indices of Zanjan City Precipitation
Hossein Asakereh *
Zanjan University , asakereh@znu.ac.ir
Abstract:   (1048 Views)
Climate is a multivariate system. Every change in every climate variable could result in different changes in climate. Recently، experts have paid extensive attention to frequency distribution sequence of climate elements. Accordingly، many different indices have been defined. Precipitation extremes can exhibit the phase space of climate system. A technique that can be used to analyze climate phase space is multivariate statistics. In order to analyze precipitation extremes simultaneity، 26 indices of daily precipitation of Zanjan city during 1961-2006 had been chosen. Principle Components Analysis has been used to find the most important components in extreme precipitation. Accordingly، 6 components could justify about 86.4% of variation in precipitation extremes indices. Spectral analyses on principle components have shown a 3- year cycle in second components as well as a 4-year cycle in forth component and 2-3 years cycles in the fifth. The second component that shows frequency and spells 95 percentile of precipitation has a significant decreasing trend. Also، there is a dropped jump in first component as the first percentile.
Keywords: Extreme Precipitation Index, Principle Components, Trend, Precipitation Cycles, Zanjan, Spectrum Analysis
Full-Text [PDF 292 kb]   (351 Downloads)    
Article Type: Original Research | Subject: Climatology
Received: 2018/08/1 | Accepted: 2018/08/1 | Published: 2018/08/1
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Asakereh H. Principle Component Analysis of Extreme Indices of Zanjan City Precipitation . geores. 2012; 27 (2) :1-18
URL: http://georesearch.ir/article-1-576-en.html


Volume 27, Issue 2 (2012) Back to browse issues page
فصلنامه تحقیقات جغرافیایی Geographical Researches Quarterly Journal
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